Solar Insolation Data - USA Cities

Solar insolation data for several cities across the USA.

USA Solar Insolation Data for Many Cities

Find the city closest to you and select the low value for your calculation (the worst case value) for off-grid systems.

State City High Low Avg   State City High Low Avg
AK Fairbanks 5.87 2.12 3.99   MO Columbia 5.50 3.97 4.73
AK Matanuska 5.24 1.74 3.55   MO St. Louis 4.87 3.24 4.38
AL Montgomery 4.69 3.37 4.23   MS Meridian 4.86 3.64 4.43
AR Bethel 6.29 2.37 3.81   MT Glasgow 5.97 4.09 5.15
AR Little Rock 5.29 3.88 4.69   MT Great Falls 5.70 3.66 4.93
AZ Tucson 7.42 6.01 6.57   MT Summit 5.17 2.36 3.99
AZ Page 7.30 5.65 6.36   NM Albuquerque 7.16 6.21 6.77
AZ Phoenix 7.13 5.78 6.58   NB Lincoln 5.40 4.38 4.79
CA Santa Maria 6.52 5.42 5.94   NB N. Omaha 5.28 4.26 4.90
CA Riverside 6.35 5.35 5.87   NC Cape Hatteras 5.81 4.69 5.31
CA Davis 6.09 3.31 5.10   NC Greensboro 5.05 4.00 4.71
CA Fresno 6.19 3.42 5.38   ND Bismarck 5.48 3.97 5.01
CA Los Angeles 6.14 5.03 5.62   NJ Sea Brook 4.76 3.20 4.21
CA Soda Springs 6.47 4.40 5.60   NV Las Vegas 7.13 5.84 6.41
CA La Jolla 5.24 4.29 4.77   NV Ely 6.48 5.49 5.98
CA Inyokern 8.70 6.87 7.66   NY Binghamton 3.93 1.62 3.16
CO Grandby 7.47 5.15 5.69   NY Ithaca 4.57 2.29 3.79
CO Grand Lake 5.86 3.56 5.08   NY Schenectady 3.92 2.53 3.55
CO Grand Junction 6.34 5.23 5.85   NY Rochester 4.22 1.58 3.31
CO Boulder 5.72 4.44 4.87   NY New York City 4.97 3.03 4.08
CT Hartford 5.40 3.33 4.74   OH Columbus 5.26 2.66 4.15
DC Washington 4.69 3.37 4.23   OH Cleveland 4.79 2.69 3.94
FL Appalachicola 5.98 4.92 5.49   OK Stillwater 5.52 4.22 4.99
FL Belie Is. 5.31 4.58 4.99   OK Oklahoma City 6.26 4.98 5.59
FL Miami 6.26 5.05 5.62   OR Astoria 4.76 1.99 3.72
FL Gainesville 5.81 4.71 5.27   OR Corvallis 5.71 1.90 4.03
FL Tampa 6.16 5.26 5.67   OR Medford 5.84 2.02 4.51
GA Atlanta 5.16 4.09 4.74   PA Pittsburgh 4.19 1.45 3.28
GA Griffin 5.41 4.26 4.99   PA State College 4.44 2.79 3.91
HI Honolulu 6.71 5.59 6.02   RI Newport 4.69 3.58 4.23
IA Ames 4.80 3.73 4.40   SC Charleston 5.72 4.23 5.06
ID Boise 5.83 3.33 4.92   SD Rapid City 5.91 4.56 5.23
ID Twin Falls 5.42 3.42 4.70   TN Nashville 5.20 3.14 4.45
IL Chicago 4.08 1.47 3.14   TN Oak Ridge 5.06 3.22 4.37
IN Indianapolis 5.02 2.55 4.21   TX San Antonio 5.88 4.65 5.30
KN Manhattan 5.08 3.62 4.57   TX Brownsville 5.49 4.42 4.92
KN Dodge City 4.14 5.28 5.79   TX El Paso 7.42 5.87 6.72
KY Lexington 5.97 3.60 4.94   TX Midland 6.33 5.23 5.83
LA Lake Charles 5.73 4.29 4.93   TX Fort Worth 6.00 4.80 5.43
LA New Orleans 5.71 3.63 4.92   UT Salt Lake City 6.09 3.78 5.26
LA Shreveport 4.99 3.87 4.63   UT Flaming Gorge 6.63 5.48 5.83
MA E. Wareham 4.48 3.06 3.99   VA Richmond 4.50 3.37 4.13
MA Boston 4.27 2.99 3.84   WA Seattle 4.83 1.60 3.57
MA Blue Hill 4.38 3.33 4.05   WA Richland 6.13 2.01 4.44
MA Natick 4.62 3.09 4.10   WA Pullman 6.07 2.90 4.73
MA Lynn 4.60 2.33 3.79   WA Spokane 5.53 1.16 4.48
MD Silver Hill 4.71 3.84 4.47   WA Prosser 6.21 3.06 5.03
ME Caribou 5.62 2.57 4.19   WI Madison 4.85 3.28 4.29
ME Portland 5.23 3.56 4.51   WV Charleston 4.12 2.47 3.65
MI Saulte Ste. Marie 4.83 2.33 4.20   WY Lander 6.81 5.50 6.06
MI E. Lansing 4.71 2.70 4.00            
MN St. Cloud 5.43 3.53 4.53            

 

Source: National Renewable Energy Laboratory

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