|
VIRGINIA
/ Sterling
Latitude (N): 38.95
Longitude
(W): 77.45
Elevation (feet): 269
Annual Precipitation (inches): 39
Annual heating degree days (base 65 deg. F): 5,010
APPROXIMATE
SUN ANGLE (at noon facing due south)
|
Mar
21
|
June
21
|
Sept
21
|
Dec
21
|
|
51 deg.
|
75 deg.
|
51 deg.
|
27 deg.
|
AVERAGE DAILY SOLAR RADIATION
| |
March
|
June
|
September
|
December
|
| On
horizontal surface |
|
kWh/m2
|
4.0 |
6.3 |
4.4 |
1.8 |
|
BTU/ft2
|
1,269 |
1,998 |
1,396 |
571 |
| On
vertical surface |
|
kWh/m2
|
3.5 |
2.5 |
3.3 |
3.0 |
|
BTU/ft2
|
1,110 |
793 |
1,047 |
952 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
32 |
59 |
55 |
26 |
| Daily
Max. - Degrees F |
55 |
83 |
79 |
45 |
| Wind
Speed - miles/hour |
9.2 |
6.7 |
6.0 |
7.8 |
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