Live/247 Rank/Maryland

Maryland 24/7 Rank

Every station in Maryland ranked by its 247 score out of 100: how reliably it reports, how accurate its readings are against a reference station, how they pass their checks and how they stand against the forecast, over the last seven days.

564 stations ranked26.4% sent every report dueranked October 4, 2026page 2 of 3Maryland instrumentsMaryland weather

A station is ranked once its week holds enough reports to measure: 12, or 3 days for a gauge that reports once a day. Of the 564 ranked here, 559 have a page of their own; the rest are platforms heard here that have not yet reported enough to be listed.

Every station, ranked

Rank	Station	Score	Network	County	Received	Reports	Arrives in	Longest silence
251	Beetree Run AT Bentley SpringsBSBM2	96.4	Gauge	Baltimore	98.8%	166 of 168	26 min	2 h
251	St Clement Creek AT ClementsCLMM2	96.4	Gauge	St Marys	98.8%	166 of 168	26 min	2 h
253	Little Annemessex River At CrisCRSM2	96.4	Gauge	Somerset	95.8%	161 of 168	21 min	2 h
254	Unicorn Branch AT MillingtonMLTM2	96.4	Gauge	Queen Annes	95.8%	161 of 168	21 min	2 h
255	Indian Head - Potomac RiverIHDM2	96.4	Gauge	Charles	94.6%	159 of 168	19 min	2 h
256	Georges Run AT BeckleysvilleBCKM2	96.2	Gauge	Baltimore	98.2%	165 of 168	26 min	2 h
256	Sawmill Creek AT Glen BurnieGBSM2	96.2	Gauge	Anne Arundel	98.2%	165 of 168	26 min	2 h
256	Little Gunpowder Falls AT Laurel BrookLBFM2	96.2	Gauge	Baltimore	98.2%	165 of 168	26 min	2 h
256	Antietam Creek AT SharpsburgSACM2	96.2	Gauge	Washington	98.2%	165 of 168	26 min	2 h
260	Monocacy River AT FrederickFRMM2	96.2	Gauge	Frederick	98.2%	165 of 168	26 min	2 h
261	Chesapeake City - 8573927CHCM2	96.0	Gauge	Cecil	98.5%	828 of 840	23 min	48 min
262	Nw Branch Patapsco River AT Fort McHenry TideBLTM2	96.0	Gauge	Baltimore City	98.5%	828 of 840	23 min	48 min
263	Potomac River AT Edwards FerryEDFM2	96.0	Gauge	Montgomery	97.6%	164 of 168	26 min	2 h
264	Riverdale 0.1 SWMD-PG-107	95.8	Volunteer	Prince Georges	100%	3 of 3	11.4 h	26 h
265	Anapolis - 8575512APAM2	95.8	Gauge	Anne Arundel	98.5%	828 of 840	24 min	48 min
265	Solomons Island - 8577330SLIM2	95.8	Gauge	Calvert	98.5%	828 of 840	24 min	48 min
267	Choptank River AT CambridgeCAMM2	95.8	Gauge	Dorchester	98.5%	828 of 840	24 min	48 min
268	Atlantic AT Ocean City InletOCIM2	95.8	Gauge	Worcester	98.5%	828 of 840	24 min	48 min
269	Monocacy River 2 E FrederickFDKM2	95.7	Gauge	Frederick	99.4%	167 of 168	31 min	2 h
270	Turkey Branch AT RockvilleRKVM2	95.7	Gauge	Montgomery	98.0%	659 of 672	20 min	75 min
270	Sligo Creek AT Takoma ParkTKPM2	95.7	Gauge	Montgomery	98.0%	659 of 672	20 min	75 min
272	Honga River AT Bishops HeadBISM2	95.6	Gauge	Dorchester	98.1%	824 of 840	24 min	48 min
273	Minebank Run AT Glen ArmGAMM2	95.6	Gauge	Baltimore	97.7%	657 of 672	20 min	75 min
274	Ne Branch Anacostia River AT Riverdale - Riverdale RdRVDM2	95.6	Gauge	Prince Georges	93.2%	470 of 504	20 min	47 min
275	Wills Creek 2 NNW CumberlandCWCM2	95.5	Gauge	Allegany	98.8%	166 of 168	31 min	2 h
276	James Run AT BelcampBLCM2	95.5	Gauge	Harford	98.8%	166 of 168	31 min	2 h
276	NB Patapsco River AT CedarhurstCDHM2	95.5	Gauge	Carroll	98.8%	166 of 168	31 min	2 h
276	Beaver Run AT FinksburgFNKM2	95.5	Gauge	Carroll	98.8%	166 of 168	31 min	2 h
279	Mount Washington 0.5 NMD-BC-3	95.4	Volunteer	Baltimore City	100%	3 of 3	12.4 h	26 h
280	AT Tolchester BeachTCBM2	95.2	Gauge	Kent	97.2%	817 of 840	25 min	48 min
281	Catoctin Mountain Raws Near Foxville 1NeFOXM2	95.1	Gauge	Frederick	100%	168 of 168	17 min	68 min
282	Parsonsburg 2WPARM2	95.0	Cooperative	Wicomico	85.7%	6 of 7	49 min	2 days
283	StevensvilleW29	94.8	Airport	Queen Annes	97.0%	489 of 504	10 min	3.8 h
284	Herring Run At Route 40HRRM2	94.8	Gauge	Baltimore City	86.6%	194 of 224	13 min	1.8 h
285	Churchville0W3	94.7	Airport	Harford	96.8%	488 of 504	10 min	3.8 h
285	Oakland2G4	94.7	Airport	Garrett	96.8%	488 of 504	10 min	3.8 h
285	Leonardtown2W6	94.7	Airport	St Marys	96.8%	488 of 504	10 min	3.8 h
285	CambridgeCGE	94.7	Airport	Dorchester	96.8%	488 of 504	10 min	3.8 h
289	South CumberlandCBLM2	94.5	Cooperative	Allegany	85.7%	6 of 7	3.5 h	24 h
290	North Beach 1.8 WNWMD-CV-21	94.4	Volunteer	Calvert	100%	3 of 3	14.4 h	26 h
291	College ParkCGS	94.4	Airport	Washington	97.2%	490 of 504	10 min	3.8 h
292	Fort MeadeFME	94.2	Airport	Anne Arundel	97.2%	490 of 504	10 min	2.7 h
293	US-50 at ChoptankMD004	94.2	Road	Dorchester	95.2%	320 of 336	24 min	2.3 h
293	I-70 at Frederick / Wash. Co lineMD015	94.2	Road	Frederick	95.2%	320 of 336	24 min	2.3 h
293	US-1 at Baltimore / Harford Co. LineMD021	94.2	Road	Baltimore	95.2%	320 of 336	24 min	2.3 h
293	US-13 at US-113MD070	94.2	Road	Worcester	95.2%	320 of 336	24 min	2.3 h
293	MD-404 at Choptank RiverMD074	94.2	Road	Caroline	95.2%	320 of 336	24 min	2.3 h
293	US 301 at MD 305MD075	94.2	Road	Queen Anne's	95.2%	320 of 336	24 min	2.3 h
299	MD 231 at Patuxent RiverMD087	94.1	Road	Charles	94.9%	319 of 336	24 min	2.3 h
300	I-495 at American Legion Bridge MD US MDDOTMD002	94.1	Road	Montgomery	94.9%	319 of 336	24 min	2.3 h
300	I-68 at Sideling HillMD012	94.1	Road	Washington	94.9%	319 of 336	24 min	2.3 h
300	US-50 at Kent NarrowsMD040	94.1	Road	Queen Annes	94.9%	319 of 336	24 min	2.3 h
300	MD-43 at MD-150MD063	94.1	Road	Baltimore	94.9%	319 of 336	24 min	2.3 h
304	I-70 at I-695MD007	94.1	Road	Howard	94.9%	319 of 336	24 min	2.3 h
304	I-97 at MD-32MD026	94.1	Road	Anne Arundel	94.9%	319 of 336	24 min	2.3 h
304	US-50 at MD-331MD038	94.1	Road	Wicomico	94.9%	319 of 336	24 min	2.3 h
304	I-95/495 at I-295MD062	94.1	Road	Prince Georges	94.9%	319 of 336	24 min	2.3 h
308	Prince Frederick 1.4 WMD-CV-7	94.0	Volunteer	Calvert	100%	3 of 3	15.4 h	24 h
309	West Laurel 1.1 NMD-PG-85	94.0	Volunteer	Prince Georges	100%	3 of 3	15.4 h	2 days
310	Huntingtown 2.9 NNWMD-CV-17	94.0	Volunteer	Calvert	100%	3 of 3	15.4 h	26 h
311	Paint Branch AT College ParkCPPM2	94.0	Gauge	Montgomery	97.0%	326 of 336	30 min	2 h
312	US-301 at MD-5MD041	94.0	Road	Prince Georges	94.6%	318 of 336	24 min	2.3 h
312	I-70 at MD-32MD052	94.0	Road	Montgomery	94.6%	318 of 336	24 min	2.3 h
314	Mount Airy 0.2 SEMD-CR-3	93.5	Volunteer	Carroll	100%	3 of 3	16.4 h	24 h
314	Forest Hill 1.7 SSEMD-HR-15	93.5	Volunteer	Harford	100%	3 of 3	16.4 h	24 h
314	Mount Airy 5.4 SEMD-HW-48	93.5	Volunteer	Howard	100%	3 of 3	16.4 h	24 h
314	Crisfield 0.9 ENEMD-SS-18	93.5	Volunteer	Somerset	100%	3 of 3	16.4 h	24 h
318	La Plata 5.8 SEMD-CH-36	93.5	Volunteer	Charles	100%	3 of 3	16.4 h	2 days
318	Colesville 1.7 WMD-MG-18	93.5	Volunteer	Montgomery	100%	3 of 3	16.4 h	2 days
318	Hyattsville 0.7 NMD-PG-79	93.5	Volunteer	Prince Georges	100%	3 of 3	16.4 h	2 days
318	Snow Hill 0.4 SMD-WR-14	93.5	Volunteer	Worcester	100%	3 of 3	16.4 h	2 days
322	I-270 at MD-109MD056	93.5	Road	Montgomery	95.2%	320 of 336	24 min	2.3 h
323	NorthbendNBDM2	93.4	Gauge	Baltimore City	84.3%	189 of 224	16 min	65 min
324	I-97 at MD-100MD027	93.3	Road	Anne Arundel	95.2%	320 of 336	24 min	2.3 h
325	Dayton AFWSDAYM2	93.3	Gauge	Howard	92.8%	936 of 1,008	16 min	80 min
326	Conococheague Creek AT FairviewFAVM2	93.3	Gauge	Washington	92.2%	155 of 168	25 min	4 h
327	Joppatowne - Foster BranchJPAM2	93.2	Gauge	Harford	97.0%	326 of 336	26 min	3.5 h
328	St InigoesNUI	92.8	Airport	St Marys	80.3%	135 of 168	12 min	3 h
329	US-340 @ MD-180MD016	92.5	Road	Frederick	94.9%	319 of 336	24 min	2.3 h
330	Maiden Choice Run At S Dukeland AveMCRM2	92.5	Gauge	Baltimore City	83.1%	335 of 403	16 min	85 min
331	MD 20 at MD 21MD101	92.4	Road	Kent	95.2%	320 of 336	33 min	2.3 h
332	US-50 @ I-95MD000	92.4	Road	Prince Georges	94.9%	319 of 336	24 min	2.3 h
333	CumberlandCBE	92.2	Airport	Allegany	97.2%	490 of 504	10 min	3.8 h
334	Cranberry Branch AT WestminsterWESM2	92.0	Gauge	Carroll	95.5%	321 of 336	31 min	3 h
335	Patuxent River NASNHK	92.0	Airport	St Marys	88.6%	149 of 168	13 min	9.3 h
336	Jones Falls (Falls And Smith)JFSM2	92.0	Gauge	Baltimore City	82.6%	333 of 403	16 min	1.6 h
337	Gwynns Falls AT Washington Blvd BaltimoreWBGM2	91.7	Gauge	Baltimore City	82.6%	333 of 403	20 min	80 min
338	Herring Run At Echodale AvenueHREM2	91.6	Gauge	Baltimore City	79.5%	308 of 387	16 min	80 min
339	Baltimore County - Alert GageLKRM2	91.4	Gauge	Baltimore	79.6%	321 of 403	16 min	85 min
340	Camp DavidRSP	90.9	Airport	Frederick	80.3%	135 of 168	11 min	5 h
341	Baltimore - Heliport4MD	90.8	Airport	Baltimore City	88.8%	448 of 504	10 min	5.3 h
342	MD-64 at MD-418MD106	90.7	Road	Washington	95.2%	320 of 336	24 min	2.3 h
343	I-70 at MD-27MD017	90.7	Road	Howard	94.3%	317 of 336	24 min	2.3 h
344	Powder Mill ScanPWDM2	90.6	Gauge	Prince Georges	95.2%	160 of 168	41 min	5 h
345	Tuckahoe RAWSTUKM2	90.2	Gauge	Caroline	86.3%	145 of 168	15 min	11 h
346	Severn 2.0 WMD-AA-4	90.0	Volunteer	Anne Arundel	100%	3 of 3	24.4 h	24 h
347	Elkridge 1.8 WMD-HW-3	90.0	Volunteer	Howard	100%	3 of 3	25.4 h	24 h
347	Potomac 2.6 NEMD-MG-123	90.0	Volunteer	Montgomery	100%	3 of 3	25.4 h	24 h
349	Deep Creek LakeOKLM2	90.0	Cooperative	Garrett	71.4%	5 of 7	29 min	36 h
350	WilliamsportWLLM2	90.0	Cooperative	Washington	71.4%	5 of 7	1.6 h	2 days
351	StevensvilleSTVM2	90.0	Cooperative	Queen Annes	71.4%	5 of 7	2.1 h	36 h
352	WestminsterDMW	89.7	Airport	Carroll	91.4%	461 of 504	10 min	10.1 h
353	MD-140 at MD-526MD018	89.7	Road	Carroll	83.1%	419 of 504	19 min	2.3 h
354	MD-4 at PatuxentMD045	89.6	Road	Calvert	83.1%	419 of 504	19 min	2.3 h
355	US 301 NB on NMB at G-10 (RWIS a MD US MDDOTMD155	89.5	Road	Charles	83.3%	420 of 504	20 min	2.3 h
356	I-83 at MD-137MD009	89.2	Road	Baltimore	81.2%	282 of 347	24 min	2.3 h
357	I-70 @ I-81MD011	89.0	Road	Washington	80.6%	280 of 347	24 min	2.3 h
358	I-495 @ MD-4MD054	88.9	Road	Prince Georges	83.1%	419 of 504	23 min	2.3 h
359	Bunting Bridge On Assateague Island National SeashoreASIM2	88.9	Gauge	Worcester	75.3%	211 of 280	20 min	2 h
360	US 50 E at Church RoadMD093	88.8	Road	Prince Georges	82.9%	418 of 504	23 min	2.3 h
361	Jones Falls (Street Car Museum)JSCM2	88.6	Gauge	Baltimore City	75.3%	217 of 288	16 min	2.9 h
362	Nw Branch Anacostia River AT BrentwoodBNTM2	88.4	Gauge	Prince Georges	70.0%	353 of 504	11 min	80 min
363	I-95 at Patuxent RiverMD006	88.3	Road	Prince Georges	80.1%	278 of 347	24 min	2.3 h
364	Harwood 2.5 WNWMD-AA-94	88.3	Volunteer	Anne Arundel	66.6%	2 of 3	26 min	36 h
364	Woodbine 4.8 SSWMD-HW-56	88.3	Volunteer	Howard	66.6%	2 of 3	26 min	36 h
364	Hagerstown 3.2 SMD-WH-22	88.3	Volunteer	Washington	66.6%	2 of 3	26 min	36 h
367	Great Mills 4.0 SMD-SM-22	88.3	Volunteer	St. Marys	66.6%	2 of 3	26 min	2 days
368	Academy Hill 1.1 WSWMD-CV-36	88.3	Volunteer	Calvert	66.6%	2 of 3	85 min	2 days
369	New Market 1.7 NWMD-FR-41	88.3	Volunteer	Frederick	66.6%	2 of 3	86 min	25 h
370	Accident 2.4 NEMD-GR-16	88.3	Volunteer	Garrett	66.6%	2 of 3	86 min	37 h
371	Birdsville 0.2 WSWMD-AA-1	88.3	Volunteer	Anne Arundel	66.6%	2 of 3	86 min	2 days
372	Gamber 0.8 WMD-CR-21	88.3	Volunteer	Carroll	66.6%	2 of 3	86 min	2.1 days
373	Columbia 2.4 NNWMD-HW-55	88.3	Volunteer	Howard	66.6%	2 of 3	86 min	47 h
374	Cockeysville 2.9 WSWMD-BL-45	88.3	Volunteer	Baltimore	66.6%	2 of 3	86 min	2 days
375	Fort Washington 1.3 SSWMD-PG-91	88.3	Volunteer	Prince Georges	66.6%	2 of 3	86 min	2 days
376	Parsonsburg 2.7 SMD-WC-28	88.3	Volunteer	Wicomico	66.6%	2 of 3	2.4 h	2 days
377	Huntingtown 1.6 NNEMD-CV-35	88.3	Volunteer	Calvert	66.6%	2 of 3	2.4 h	2 days
378	I-68 at WV LineMD129	88.0	Road	Garrett	91.9%	309 of 336	24 min	5.1 h
379	Bay Bridge N-13 W/BMD065	88.0	Road	Queen Anne's	78.1%	394 of 504	19 min	2.3 h
379	Bay Bridge S-9 E/BMD066	88.0	Road	Anne Arundel	78.1%	394 of 504	19 min	2.3 h
379	US 50 EB on OC Drawbridge Wind S MD US MDDOTMD151	88.0	Road	Worcester	78.1%	394 of 504	19 min	2.3 h
379	MDTA Bridge GraphsMD154	88.0	Road	Anne Arundel	78.1%	394 of 504	19 min	2.3 h
383	US-301at Potomac Riv.MD023	87.9	Road	Charles	77.9%	393 of 504	19 min	2.3 h
383	Hatem Bridge US 40 W/BMD067	87.9	Road	Cecil	77.9%	393 of 504	19 min	2.3 h
383	I-95 at Millard E. Tydings Memor MD US MDDOTMD150	87.9	Road	Cecil	77.9%	393 of 504	19 min	2.3 h
383	US 301 NB at G-17 (VIS-3 in VA)MD156	87.9	Road	Charles	77.9%	393 of 504	19 min	2.3 h
387	Jarrettsville 3.7 WNWMD-HR-41	87.9	Volunteer	Harford	66.6%	2 of 3	3.4 h	2 days
388	Westminster 1.2 NEMD-CR-41	87.9	Volunteer	Carroll	66.6%	2 of 3	3.4 h	2.1 days
389	Williamsport 2.8 ENEMD-WH-1	87.9	Volunteer	Washington	66.6%	2 of 3	3.4 h	38 h
390	Cambridge 1.4 WNWMD-DR-7	87.9	Volunteer	Dorchester	66.6%	2 of 3	3.4 h	35 h
391	I-95 at I-695MD044	87.8	Road	Baltimore	78.1%	394 of 504	20 min	2.3 h
392	I-68 @ US-219MD014	87.7	Road	Garrett	77.9%	393 of 504	20 min	2.3 h
392	US-50 at OC DrawbridgeMD135	87.7	Road	Worcester	77.9%	393 of 504	20 min	2.3 h
392	MD-200 EB at Bonifant RdMD140	87.7	Road	Montgomery	77.9%	393 of 504	20 min	2.3 h
395	I-95 at Tydings BrMD024	87.6	Road	Cecil	77.7%	392 of 504	20 min	2.3 h
396	US-15 at MD-140MD051	87.4	Road	Frederick	95.2%	320 of 336	24 min	2.3 h
397	MD-136 at MD-646MD042	87.2	Road	Harford	78.1%	394 of 504	23 min	2.3 h
397	I-70 at MonacacyMD050	87.2	Road	Frederick	78.1%	394 of 504	23 min	2.3 h
397	US-29 at Mid PatuxentMD053	87.2	Road	Montgomery	78.1%	394 of 504	23 min	2.3 h
397	IS 270 S - South of Middlebrook MD US MDDOTMD083	87.2	Road	Montgomery	78.1%	394 of 504	23 min	2.3 h
397	IS 270 N - North of MD 80MD084	87.2	Road	Frederick	78.1%	394 of 504	23 min	2.3 h
397	IS 695 IL past US 1MD091	87.2	Road	Baltimore	78.1%	394 of 504	23 min	2.3 h
397	I-95 / 495 NB past MD 201MD125	87.2	Road	Prince Georges	78.1%	394 of 504	23 min	2.3 h
397	I-270 NB at Comus RoadMD136	87.2	Road	Montgomery	78.1%	394 of 504	23 min	2.3 h
397	I-68 W-2 Mi Prior to Ex. 47MD144	87.2	Road	Allegany	78.1%	394 of 504	23 min	2.3 h
406	I 95 S - past MD 212MD003	87.1	Road	Prince Georges	77.9%	393 of 504	23 min	2.3 h
406	I-195 @ MD-295MD010	87.1	Road	Anne Arundel	77.9%	393 of 504	23 min	2.3 h
406	I-95 at Howard / Baltimore Co. LineMD019	87.1	Road	Anne Arundel	77.9%	393 of 504	23 min	2.3 h
406	MD-175 at MD-295MD031	87.1	Road	Anne Arundel	77.9%	393 of 504	23 min	2.3 h
406	I-70 at MD-522MD047	87.1	Road	Washington	77.9%	393 of 504	23 min	2.3 h
406	MD 23 @ MeadowTree Rd.MD058	87.1	Road	Baltimore	77.9%	393 of 504	23 min	2.3 h
406	IS 68 W of 15 MI CreekMD076	87.1	Road	Allegany	77.9%	393 of 504	23 min	2.3 h
406	IS 83 SB at MD 439MD078	87.1	Road	Baltimore	77.9%	393 of 504	23 min	2.3 h
406	IS 95/495 I/L at MD 5MD079	87.1	Road	Prince Georges	77.9%	393 of 504	23 min	2.3 h
406	IS 695 O/L South of IS 95MD080	87.1	Road	Baltimore	77.9%	393 of 504	23 min	2.3 h
406	IS 70 West of US-29MD081	87.1	Road	Howard	77.9%	393 of 504	23 min	2.3 h
406	MD 295 N - South of IS 895MD082	87.1	Road	Anne Arundel	77.9%	393 of 504	23 min	2.3 h
406	IS 83 SB - South of Shawan RdMD085	87.1	Road	Baltimore	77.9%	393 of 504	23 min	2.3 h
406	IS 83 N at Old Pimlico RoadMD086	87.1	Road	Baltimore	77.9%	393 of 504	23 min	2.3 h
406	US 50 East - 2 Mi prior to MD-32 MD US MDDOTMD088	87.1	Road	Talbot	77.9%	393 of 504	23 min	2.3 h
406	US 50 E/B at MD 90MD089	87.1	Road	Worcester	77.9%	393 of 504	23 min	2.3 h
406	MD 140 S at Balt. Co LineMD090	87.1	Road	Carroll	77.9%	393 of 504	23 min	2.3 h
406	IS 695 S 1.5mi N of IS 795MD092	87.1	Road	Baltimore	77.9%	393 of 504	23 min	2.3 h
406	US 50 E - prior to MD 410MD096	87.1	Road	Prince Georges	77.9%	393 of 504	23 min	2.3 h
406	US 301 SB North of MD 4MD099	87.1	Road	Prince Georges	77.9%	393 of 504	23 min	2.3 h
406	MD-135 at Meadow Oaks DriveMD107	87.1	Road	Garrett	77.9%	393 of 504	23 min	2.3 h
406	US-40 W at MD-132MD108	87.1	Road	Harford	77.9%	393 of 504	23 min	2.3 h
406	MD 22 E at Shucks RoadMD111	87.1	Road	Harford	77.9%	393 of 504	23 min	2.3 h
406	US-40 W at MD-755MD112	87.1	Road	Harford	77.9%	393 of 504	23 min	2.3 h
406	MD 222 N North of I-95MD113	87.1	Road	Cecil	77.9%	393 of 504	23 min	2.3 h
406	US 40 West of Mechanics Valley R MD US MDDOTMD114	87.1	Road	Cecil	77.9%	393 of 504	23 min	2.3 h
406	US-50 WB at Friendship RoadMD116	87.1	Road	Wicomico	77.9%	393 of 504	23 min	2.3 h
406	IS 97 N prior to Hawkins RoadMD118	87.1	Road	Anne Arundel	77.9%	393 of 504	23 min	2.3 h
406	IS 68 EB E of Ex 19 MD-495MD119	87.1	Road	Garrett	77.9%	393 of 504	23 min	2.3 h
406	MD 404 E - East of Newtown Road MD US MDDOTMD123	87.1	Road	Talbot	77.9%	393 of 504	23 min	2.3 h
406	I-495 I/L prior to MD 650MD128	87.1	Road	Montgomery	77.9%	393 of 504	23 min	2.3 h
406	MD-404 WB E of MD-312MD142	87.1	Road	Caroline	77.9%	393 of 504	23 min	2.3 h
406	US-29 @ Middle Patuxent RiverMD152	87.1	Road	Howard	77.9%	393 of 504	23 min	2.3 h
406	I-70 W of I-270MD153	87.1	Road	Frederick	77.9%	393 of 504	23 min	2.3 h
440	MD-200 WB at Muncaster Mill RdMD069	87.0	Road	Montgomery	78.1%	394 of 504	20 min	2.3 h
441	I-795 at MD-140MD043	87.0	Road	Carroll	77.7%	392 of 504	23 min	2.3 h
441	MD 24 at Jarrettsville RoadMD059	87.0	Road	Harford	77.7%	392 of 504	23 min	2.3 h
441	IS 70 WB at South MountainMD064	87.0	Road	Frederick	77.7%	392 of 504	23 min	2.3 h
441	IS 695 W at Providence RdMD077	87.0	Road	Baltimore	77.7%	392 of 504	23 min	2.3 h
441	US 29 NB at MD 108MD097	87.0	Road	Howard	77.7%	392 of 504	23 min	2.3 h
441	MD 4 South at MD 235MD098	87.0	Road	St. Marys	77.7%	392 of 504	23 min	2.3 h
441	MD 5 North at MD 246MD100	87.0	Road	St. Marys	77.7%	392 of 504	23 min	2.3 h
441	US 50 E 3Mi W of I 97MD102	87.0	Road	Anne Arundel	77.7%	392 of 504	23 min	2.3 h
441	MD 404 E prior to MD 16MD104	87.0	Road	Caroline	77.7%	392 of 504	23 min	2.3 h
441	US 50 East past MD-347MD115	87.0	Road	Wicomico	77.7%	392 of 504	23 min	2.3 h
441	MD-10 NB S of N Thompson Avenue MD US MDDOTMD117	87.0	Road	Anne Arundel	77.7%	392 of 504	23 min	2.3 h
441	US 50E at MD 331MD121	87.0	Road	Talbot	77.7%	392 of 504	23 min	2.3 h
441	US 13 NB at MD 12MD127	87.0	Road	Wicomico	77.7%	392 of 504	23 min	2.3 h
441	US-301 NB S of MD-6MD139	87.0	Road	Charles	77.7%	392 of 504	23 min	2.3 h
455	IS 270 S prior to IS 495MD095	86.9	Road	Montgomery	77.5%	391 of 504	23 min	2.3 h
455	MD 295 NB at MD 202MD146	86.9	Road	Prince Georges	77.5%	391 of 504	23 min	2.3 h
457	US 219 S at Deep Creek LakeMD145	86.9	Road	Garrett	77.3%	390 of 504	23 min	2.3 h
458	Chevy Chase 1.2 SWMD-MG-152	86.9	Volunteer	Montgomery	66.6%	2 of 3	5.4 h	35 h
459	Southwest Branch 1 S Truman Drive/LargoHTNM2	86.6	Gauge	Prince Georges	67.6%	341 of 504	11 min	1.8 h
460	Riggs Rd./Sligo CreekCHLM2	86.6	Gauge	Prince Georges	66.8%	337 of 504	11 min	1.7 h
461	Oxford - Coop Oxford LabCXLM2	86.5	Gauge	Talbot	95.2%	160 of 168	56 min	7 h
462	Potomac 0.9 NNWMD-MG-3	86.5	Volunteer	Montgomery	66.6%	2 of 3	6.4 h	2 days
463	I-68 at Md 55MD035	86.2	Road	Allegany	83.1%	419 of 504	23 min	2.3 h
464	I-83 at I-695MD008	86.0	Road	Baltimore	75.2%	379 of 504	23 min	2.3 h
465	Thomas Johnson BridgeMD147	85.9	Road	Calvert	74.3%	357 of 480	23 min	2.3 h
466	Moores Run At Moravia Ind PkMOOM2	85.8	Gauge	Baltimore City	69.2%	279 of 403	16 min	2.6 h
467	Bear Branch AT Laurel LakeLLBM2	85.8	Gauge	Prince Georges	65.4%	330 of 504	11 min	1.8 h
468	GreenbeltGRNM2	85.7	Gauge	Prince Georges	70.9%	715 of 1,008	15 min	80 min
469	Western Branch AT Upper MarlboroUPRM2	85.7	Gauge	Prince Georges	62.7%	253 of 403	16 min	80 min
470	I-68 WB at Lower New Germany Roa MD US MDDOTMD137	85.5	Road	Garrett	80.3%	405 of 504	23 min	5.1 h
471	Indian Creek AT Beltsville - Odell RdBVLM2	85.5	Gauge	Prince Georges	66.8%	337 of 504	16 min	1.8 h
472	EmmitsburgEMMM2	85.0	Cooperative	Frederick	85.7%	6 of 7	24.3 h	36.9 h
473	MD-77 EB at Catoctin State Park MD US MDDOTMD143	84.9	Road	Frederick	82.7%	417 of 504	23 min	2.3 h
474	US-13 at US-50MD037	84.7	Road	Worcester	71.0%	341 of 480	23 min	2.3 h
475	Little Paint Branch AT Calverton - Briggs Chaney RdCVTM2	84.6	Gauge	Prince Georges	56.3%	218 of 387	11 min	71 min
476	I-68 EB at Street RoadMD141	84.4	Road	Allegany	77.7%	392 of 504	23 min	2.3 h
477	EastonESN	84.2	Airport	Talbot	55.5%	280 of 504	10 min	65 min
478	MD-30 at PA LineMD020	84.1	Road	Carroll	69.5%	334 of 480	24 min	2.3 h
479	Little Patuxent River AT CentennialCTNM2	83.8	Gauge	Howard	58.5%	236 of 403	11 min	2 h
480	Princess AnnePRAM2	83.8	Cooperative	Somerset	57.1%	4 of 7	5 h	2 days
481	US-15 SB at St. Anthony RoadMD130	83.7	Road	Frederick	75.4%	380 of 504	23 min	5.1 h
481	IS 70 WB at MD-66MD132	83.7	Road	Washington	75.4%	380 of 504	23 min	5.1 h
481	IS 81 SB at Showalter RoadMD133	83.7	Road	Washington	75.4%	380 of 504	23 min	5.1 h
481	IS 70 WB at MD-68MD134	83.7	Road	Washington	75.4%	380 of 504	23 min	5.1 h
485	IS 70 WB at Mt. Phillip RoadMD131	83.7	Road	Frederick	75.2%	379 of 504	23 min	5.1 h
485	I-68 WB at Old Morgantown RoadMD138	83.7	Road	Garrett	75.2%	379 of 504	23 min	5.1 h
487	MD-213 at SassafrasMD039	83.7	Road	Cecil	68.5%	329 of 480	24 min	2.3 h
488	MD-51 at Oldtown Salt DomeMD071	83.7	Road	Allegany	68.5%	329 of 480	24 min	2.3 h
489	MD-24 at Rocks State ParkMD034	83.7	Road	Baltimore	68.3%	328 of 480	24 min	2.3 h
490	MD-33 at Knapps Narrows Drawbrid MD US MDDOTMD073	83.6	Road	Talbot	68.1%	327 of 480	24 min	2.3 h
491	MD-344 at MD-224MD105	83.6	Road	Charles	66.9%	281 of 420	24 min	2.3 h
492	US-50 at MD-2MD029	83.4	Road	Anne Arundel	73.7%	354 of 480	23 min	2.3 h
493	MD 260 at Cox RdMD103	83.3	Road	Calvert	67.0%	322 of 480	24 min	2.3 h
494	I-270 @ I-370MD001	83.1	Road	Montgomery	72.2%	347 of 480	24 min	2.3 h
495	US-1at ConowingoMD005	83.0	Road	Cecil	66.2%	318 of 480	24 min	2.3 h
496	CylburCYLM2	83.0	Cooperative	Baltimore City	57.1%	4 of 7	6.6 h	2.5 days
497	Denton 5.8 WSWMD-CL-10	82.8	Volunteer	Caroline	66.6%	2 of 3	14.4 h	2 days
498	Leonardtown 0.6 NEMD-SM-3	82.3	Volunteer	St. Marys	66.6%	2 of 3	15.4 h	38 h
499	Olney 1.0 NEMD-MG-162	82.3	Volunteer	Montgomery	66.6%	2 of 3	15.4 h	2 days
500	Montgomery Village 1.3 SSWMD-MG-1	82.3	Volunteer	Montgomery	66.6%	2 of 3	15.4 h	3 days

How a station is ranked

The 247 Rank answers one question about a weather station: can its readings be relied on? A station has to deliver: its reports arrive when due, soon, without long silences. And its readings have to be right: close to a trusted station nearby, passing their checks, and in step with the weather the forecast and its neighbours confirm.

The 247 score

Storm Station's poller asks every network on its own schedule, around the clock, and keeps the time of every report it hears; the reference comparison and the forecast engine keep the rest. From the last seven days of that record each station is scored out of 100 on six parts, and its 247 score is their weighted mean:

Reports receivedweight 35The share of its scheduled reports received. A station that sends every 5 minutes is due 2,016 reports in a week; one that reports once a day is due 7. Each report is counted in a slot centred on the station's own report time, so a report a minute early or late is still on time, and the week ends an hour back, so a report still on its way is never counted missed.Full marks: 100% received. No marks: none received.
Arrivalweight 10The median time its reports took to arrive from the moment a reading was taken to the moment it reached Storm Station.Full marks: within 10 minutes, or a tenth of its schedule for a station that reports less often. No marks: an hour, or its whole schedule.
Continuityweight 10Its longest silence against its own schedule, so a daily gauge is not marked down for a day between reports.Full marks: a silence of 3 reports or less. No marks: 72 reports, falling evenly on a log scale between.
Accuracyweight 20How closely its temperature follows its reference station the nearest airport or climate reference station that reported within half an hour, up to 15 miles away, reading by reading. A steady offset is taken out, and where both heights are known only the offset beyond 3 F that the height difference does not explain is counted.Full marks: within 1.5 F, allowing 0.1 F more for each mile to the reference. No marks: 6.5 F beyond that.
Instrument checksweight 15The share of its readings that pass a check. For an airfield, the check the forecast engine runs the next day: each reading against the stations around it, as weather services check their own. For any other station, a reading 20 F or more from its reference fails, unless the two stand 3,000 ft or more apart.Full marks: none failed. No marks: 5% failed.
Forecast checkweight 10How closely its temperature matched Storm Station's forecast for the same hours, checked the next day, for every airfield the forecast engine scores. A station whose readings stray far from a forecast its neighbours confirm is one to doubt.Full marks: within 2 F on average. No marks: 8 F.

A part is scored once the week holds 24 readings or comparisons for it. A part that cannot be measured where a station stands counts at the middle of its state's measured stations, so the station is neither lifted nor sunk by it. A part measured nowhere in the state is left out, and the others carry its weight.

From score to rank

Each state's stations are ranked by their score, to the tenth. At an equal score the longer record comes first: a station that sent 2,016 of 2,016 reports has shown more than one that sent 7 of 7. Then the faster arrival, then the shorter silence. Ties on all of them share a rank, as a race is scored: three stations tied for third are all third, and the next is sixth.

A station is ranked once its week holds enough reports to measure: 12, or 3 days for a gauge that reports once a day. The rank is made again every day, so a station that falls silent or starts to read wrong drops, and one that recovers climbs back. Every page shows the same ranking: a station's rank here, in its state's list and on its own page come from one run, and a new run reaches them together. Each station's page shows its score part by part, with the figures behind each.

The same figures as data

/api/ranks for a state and /api/rank for one station, its score in parts; the developer page has every field.