|
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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