|
MONTANA
/ Helena
Latitude (N): 46.60
Longitude
(W): 112.00
Elevation (feet): 3,898
Annual Precipitation (inches): 12
Annual heating degree days (base 65 deg. F): 8,940
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
|
3.5 |
6.5 |
4.4 |
1.2 |
|
BTU/ft2
|
1,110 |
2,062 |
1,396 |
380 |
| On
vertical surface |
|
kWh/m2
|
3.9 |
3.0 |
4.1 |
2.7 |
|
BTU/ft2
|
1,237 |
952 |
1,301 |
856 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
22 |
48 |
41 |
11 |
| Daily
Max. - Degrees F |
45 |
76 |
70 |
31 |
| Wind
Speed - miles/hour |
8.3 |
8.3 |
7.2 |
6.3 |
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