|
MONTANA
/ Great Falls
Latitude (N): 47.48
Longitude
(W): 111.37
Elevation (feet): 3,668
Annual Precipitation (inches): 15
Annual heating degree days (base 65 deg. F): 7,770
APPROXIMATE
SUN ANGLE (at noon facing due south)
|
Mar
21
|
June
21
|
Sept
21
|
Dec
21
|
|
43 deg.
|
67 deg.
|
43 deg.
|
19 deg.
|
AVERAGE DAILY SOLAR RADIATION
| |
March
|
June
|
September
|
December
|
| On
horizontal surface |
|
kWh/m2
|
3.7 |
6.7 |
4.3 |
1.2 |
|
BTU/ft2
|
1,174 |
2,125 |
1,364 |
380 |
| On
vertical surface |
|
kWh/m2
|
4.2 |
3.2 |
4.1 |
2.8 |
|
BTU/ft2
|
1,332 |
1,015 |
1,301 |
888 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
23 |
48 |
44 |
15 |
| Daily
Max. - Degrees F |
44 |
75 |
70 |
33 |
| Wind
Speed - miles/hour |
12.1 |
10.3 |
10.5 |
14.3 |
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