At 640 ft above sea level, 2 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.24 inHg and the temperature at 56.7 F.
On Oct 6 the noon sun stands 43 degrees above the horizon at 41.32 N, and the day is 11 h 22 min long. Level ground there takes 69 per cent of the noon sunlight a surface facing the sun would.