|
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 |
[Select
another city]
|
|
