|
VIRGINIA/
Roanoke
Latitude (N): 37.32
Longitude
(W): 79.97
Elevation (feet): 1,174
Annual Precipitation (inches): 39
Annual heating degree days (base 65 deg. F): 4,320
APPROXIMATE
SUN ANGLE (at noon facing due south)
|
Mar
21
|
June
21
|
Sept
21
|
Dec
21
|
|
53 deg.
|
77 deg.
|
53 deg.
|
31 deg.
|
AVERAGE DAILY SOLAR RADIATION
| |
March
|
June
|
September
|
December
|
| On
horizontal surface |
|
kWh/m2
|
4.1 |
6.2 |
4.5 |
2.0 |
|
BTU/ft2
|
1,301 |
1,967 |
1,427 |
634 |
| On
vertical surface |
|
kWh/m2
|
3.6 |
2.3 |
3.3 |
3.3 |
|
BTU/ft2
|
1,142 |
730 |
1,047 |
1,047 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
36 |
60 |
57 |
29 |
| Daily
Max. - Degrees F |
58 |
83 |
78 |
48 |
| Wind
Speed - miles/hour |
9.6 |
6.9 |
6.0 |
8.5 |
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