|
IOWA
/ Des Moines
Latitude (N): 41.53
Longitude
(W): 93.65
Elevation (feet): 964
Annual Precipitation (inches): 32
Annual heating degree days (base 65 deg. F): 6,550
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
|
3.8 |
6.5 |
4.4 |
1.7 |
|
BTU/ft2
|
1,205 |
2,062 |
1,396 |
539 |
| On
vertical surface |
|
kWh/m2
|
3.6 |
2.7 |
3.6 |
3.1 |
|
BTU/ft2
|
1,142 |
856 |
1,142 |
983 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
28 |
61 |
55 |
16 |
| Daily
Max. - Degrees F |
47 |
82 |
75 |
33 |
| Wind
Speed - miles/hour |
12.3 |
9.8 |
9.2 |
11.0 |
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