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> WEATHER DATA

ILLINOIS / Springfield
Latitude (N): 39.83
Longitude (W): 89.67
Elevation (feet): 613
Annual Precipitation (inches): 34
Annual heating degree days (base 65 deg. F): 5,650

APPROXIMATE SUN ANGLE (at noon facing due south)

Mar 21
June 21
Sept 21
Dec 21
50 deg.
74 deg.
50 deg.
26 deg.



AVERAGE DAILY SOLAR RADIATION

 
March
June
September
December
On horizontal surface
kWh/m2
3.7 6.5 4.6 1.7
BTU/ft2
1,174 2,062 1,459 539
On vertical surface
kWh/m2
3.3 2.5 3.6 2.9
BTU/ft2
1,047 793 1,142 920


AVERAGE TEMPERATURE AND WIND SPEED

 
March
June
September
December
Daily Min. - Degrees F 32 62 56 22
Daily Max. - Degrees F 50 84 79 37
Wind Speed - miles/hour 13.2 9.4 8.9 12.1

 

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