|
IOWA
/ Waterloo
Latitude (N): 42.55
Longitude
(W): 92.40
Elevation (feet): 869
Annual Precipitation (inches): 33
Annual heating degree days (base 65 deg. F): 7,540
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
|
3.6 |
6.4 |
4.3 |
1.5 |
|
BTU/ft2
|
1,142 |
2,030 |
1,364 |
476 |
| On
vertical surface |
|
kWh/m2
|
3.6 |
2.7 |
3.5 |
2.9 |
|
BTU/ft2
|
1,142 |
856 |
1,110 |
920 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
25 |
57 |
50 |
12 |
| Daily
Max. - Degrees F |
43 |
80 |
74 |
29 |
| Wind
Speed - miles/hour |
12.5 |
9.8 |
9.2 |
11.4 |
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