|
MONTANA
/ Billings
Latitude (N): 45.80
Longitude
(W): 108.53
Elevation (feet): 3,570
Annual Precipitation (inches): 15
Annual heating degree days (base 65 deg. F): 7,212
APPROXIMATE
SUN ANGLE (at noon facing due south)
|
Mar
21
|
June
21
|
Sept
21
|
Dec
21
|
|
44 deg.
|
68 deg.
|
44 deg.
|
20 deg.
|
AVERAGE DAILY SOLAR RADIATION
| |
March
|
June
|
September
|
December
|
| On
horizontal surface |
|
kWh/m2
|
3.8 |
6.7 |
4.5 |
1.4 |
|
BTU/ft2
|
1,205 |
2,125 |
1,427 |
444 |
| On
vertical surface |
|
kWh/m2
|
4.2 |
3.0 |
4.2 |
3.3 |
|
BTU/ft2
|
1,332 |
952 |
1,332 |
1,047 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
25 |
52 |
46 |
17 |
| Daily
Max. - Degrees F |
46 |
78 |
72 |
34 |
| Wind
Speed - miles/hour |
11.2 |
9.6 |
9.8 |
13.2 |
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