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> WEATHER DATA

ILLINOIS / Rockford
Latitude (N): 42.40
Longitude (W): 89.10
Elevation (feet): 725
Annual Precipitation (inches): 37
Annual heating degree days (base 65 deg. F): 6,950

APPROXIMATE SUN ANGLE (at noon facing due south)

Mar 21
June 21
Sept 21
Dec 21
48 deg.
72 deg.
48 deg.
24 deg.



AVERAGE DAILY SOLAR RADIATION

 
March
June
September
December
On horizontal surface
kWh/m2
3.5 6.3 4.2 1.5
BTU/ft2
1,110 1,998 1,332 476
On vertical surface
kWh/m2
3.4 2.7 3.4 2.7
BTU/ft2
1,078 856 1, 078 856


AVERAGE TEMPERATURE AND WIND SPEED

 
March
June
September
December
Daily Min. - Degrees F 26 57 52 16
Daily Max. - Degrees F 44 80 74 32
Wind Speed - miles/hour 12.1 9.4 8.5 10.7

 

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