|
DELAWARE
/ Wilmington
Latitude (N): 39.67
Longitude
(W): 75.60
Elevation (feet): 79
Annual Precipitation (inches): 41
Annual heating degree days (base 65 deg. F): 4,990
APPROXIMATE
SUN ANGLE (at noon facing due south)
|
Mar
21
|
June
21
|
Sept
21
|
Dec
21
|
|
50 deg.
|
74 deg.
|
50 deg.
|
26 deg.
|
AVERAGE DAILY SOLAR RADIATION
| |
March
|
June
|
September
|
December
|
| On
horizontal surface |
|
kWh/m2
|
3.9 |
6.2 |
4.4 |
1.7 |
|
BTU/ft2
|
1,237 |
1,967 |
1,396 |
539 |
| On
vertical surface |
|
kWh/m2
|
3.5 |
2.5 |
3.4 |
3.0 |
|
BTU/ft2
|
1,110 |
793 |
1,078 |
952 |
AVERAGE TEMPERATURE
AND WIND SPEED
| |
March
|
June
|
September
|
December
|
| Daily
Min. - Degrees F |
33 |
62 |
58 |
28 |
| Daily
Max. - Degrees F |
52 |
81 |
78 |
44 |
| Wind
Speed - miles/hour |
11.4 |
8.5 |
8.1 |
9.6 |
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