|
MICHIGAN
/ Grand Rapids
Latitude (N): 42.88
Longitude
(W): 85.52
Elevation (feet): 804
Annual Precipitation (inches): 34
Annual heating degree days (base 65 deg. F): 6,930
APPROXIMATE
SUN ANGLE (at noon facing due south)
|
Mar
21
|
June
21
|
Sept
21
|
Dec
21
|
|
47 deg.
|
71 deg.
|
47 deg.
|
23 deg.
|
AVERAGE DAILY SOLAR RADIATION
| |
March
|
June
|
September
|
December
|
| On
horizontal surface |
|
kWh/m2
|
3.5 |
6.3 |
4.1 |
1.3 |
|
BTU/ft2
|
1,110 |
1,998 |
1,301 |
412 |
| On
vertical surface |
|
kWh/m2
|
3.4 |
2.7 |
3.3 |
1.9 |
|
BTU/ft2
|
1,078 |
856 |
1,047 |
603 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
25 |
55 |
50 |
21 |
| Daily
Max. - Degrees F |
43 |
79 |
72 |
33 |
| Wind
Speed - miles/hour |
11.4 |
8.9 |
8.3 |
10.7 |
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