Find the nearest city near you to determine your yearly average sun hours. When calculating the size of your system, it is important to use the yearly average so that you can account for how much solar energy you could produce based on the amount of sunlight you receive throughout the year.
State, CitySummer Avg.Winter Avg.Year Avg.
AL, Montgomery4.693.374.23
AK, Bethel6.292.373.81
AK, Fairbanks5.872.123.99
AK, Mantanuska5.241.743.55
AZ, Page7.35.656.36
AZ, Phoenix7.135.786.58
AZ, Tucson7.426.016.57
AR, Little Rock5.293.884.69
CA, Davis6.093.315.1
CA, Fresno6.193.425.38
CA, Inyokem8.76.977.66
CA, La Jolla5.244.294.77
CA, Los Angeles6.145.035.62
CA, Riverside6.355.355.87
CA, Santa Maria6.525.425.94
CA, Soda Springs6.474.45.6
CO, Boulder5.724.444.87
CO, Granby7.475.155.69
CO, Grand Junction6.345.235.86
CO, Grand Lake5.863.565.08
D.C. Washington4.693.374.23
FL, Apalachicola5.984.925.49
FL, Belle Island5.314.584.99
FL, Gainesville5.814.715.27
FL, Miami6.265.055.62
FL, Tampa6.165.265.67
GA, Atlanta5.164.094.74
GA, Griffin5.414.264.99
HI, Honolulu6.715.596.02
IA, Ames4.83.734.4
ID, Boise5.833.334.92
IL, Chicago4.081.473.14
IN, Indianapolis5.022.554.21
KS, Dodge City4.145.285.79
KS, Manhattan5.083.624.57
KY, Lexington5.973.64.94
LA, Lake Charles5.734.294.93
LA, New Orleans5.713.634.92
LA, Shreveport4.993.874.63
MA, Blue Hill4.383.334.05
MA, Boston4.272.993.84
MA, E. Wareham4.483.063.99
MA, Lynn4.62.333.79
MA, Natick4.623.094.1
MD, Silver Hill4.713.844.47
ME, Caribou5.622.574.19
ME, Portland5.23.564.51
MI, E. Lansing4.712.74
MI, Sault Ste. Marie4.832.334.2
MN, St. Cloud5.433.534.53
MO, Columbia5.53.974.73
MO, St. Louis4.873.243.78
MS, Meridian4.863.644.44
MT, Glasgow5.974.095.15
MT, Great Falls5.73.664.93
MT, Summit5.172.393.99
NC, Cape Hatteras5.814.695.31
NC, Greensboro5.0544.71
ND, Bismark5.483.975.01
NE, Lincoln5.44.384.79
NE, North Omaha5.284.264.9
NJ, Sea Brook4.763.24.21
NM, Albuquerque7.166.216.77
NV, Ely6.485.495.98
NV, Las Vegas7.135.836.41
NY, Bridge Hampton3.931.623.16
NY, Ithaca4.572.293.79
NY, New York4.973.034.08
NY, Rochester4.221.583.31
NY, Schenectady3.922.533.55
OH, Cleveland4.792.693.94
OH, Columbus5.262.664.16
OK, Oklahoma City6.264.985.59
OK, Stillwater5.524.224.99
OR, Astoria4.761.993.72
OR, Corvallis5.711.94.03
OR, Medford5.842.024.51
PA, Pittsburgh4.191.453.28
PA, State College4.442.783.91
RI, Newport4.693.584.23
SC, Charleston5.724.235.06
SD, Rapid City5.914.565.23
TN, Nashville5.23.144.45
TN, Oak Ridge5.063.224.37
TX, Brownsville5.494.424.92
TX, El Paso7.425.876.72
TX, Fort Worth64.85.83
TX, Midland6.335.235.83
TX, San Antonio5.884.655.3
UT, Flaming Gorge6.635.485.83
UT, Salt Lake City6.093.785.26
VA, Richmond4.53.374.13
WA, Prosser6.213.065.03
WA, Pullman6.072.94.73
WA, Richland6.132.014.43
WA, Seattle4.831.63.57
WA, Spokane5.531.164.48
WV, Charleston4.122.473.65
WI, Madison4.853.284.29
WY, Lander6.815.56.06
Province, CitySummer Avg.Winter Avg.Year Avg
Alberta, Edmonton4.952.133.75
Alberta, Suffield5.192.754.1
British Columbia, Kamloops4.481.463.29
British Columbia, Prince George4.131.333.14
British Columbia, Vancouver4.231.333.14
Manitoba, The Pas5.022.023.56
Manitoba, Winnipeg New Brunswick5.22.774.02
Fredericton4.232.543.56
Newfoundland, Goose Bay4.652.023.33
Newfoundland, St. Johns3.891.833.15
Northwest Territory, Fort Smith5.160.883.29
Northwest Territory, Norman Wells5.040.062.89
Nova Scotia, Halifax4.022.163.38
Ontario, Ottawa4.632.353.7
Ontario, Toronto3.982.133.44
Prince Edward Island, Charlottetown4.312.293.56
Quebec, Montreal4.22.293.56
Quebec, Sept-Isles4.292.333.5
Saskatchewan, Swift Current5.252.774.23
Yukon, Whitehorse4.810.693.1
Source: NREL
For more in depth information about solar radiation around the world, visit the National Renewable Energy Laboratory’s NSRDB (National Solar Radiation Database)
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