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> WEATHER DATA

WASHINGTON / Seattle
Latitude (N): 47.45
Longitude (W): 122.30
Elevation (feet):
400
Annual Precipitation (inches):
38
Annual heating degree days (base 65 deg. F): 4,680

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
2.8 5.8 3.8 0.8
BTU/ft2
888 1,840 1,205 254
On vertical surface
kWh/m2
2.8 2.8 3.4 1.3
BTU/ft2
888 888 1,078 412


AVERAGE TEMPERATURE AND WIND SPEED

 
March
June
September
December
Daily Min. - Degrees F 38 52 52 36
Daily Max. - Degrees F 53 70 69 45
Wind Speed - miles/hour 8.9 8.3 7.6 8.9

 

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