Insolation Levels North America
Average Insolation (10 year average) kWh/m2/day
| State | City | Latitude | Longitude | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year Avg |
| AL | Birmingham | 33° 34' N | 86° 45' W | 2.29 | 3.31 | 4.04 | 5.14 | 5.92 | 5.98 | 5.81 | 5.7 | 4.8 | 3.93 | 2.96 | 2.25 | 4.34 |
| AK | Anchorage | 61° 10' N | 150° 1' W | 0.21 | 0.76 | 1.68 | 3.12 | 3.98 | 4.58 | 4.25 | 3.16 | 1.98 | 0.98 | 0.37 | 0.12 | 2.09 |
| AR | Little Rock | 32° 25' N | 94° 44' W | 2.36 | 3.39 | 4.01 | 5.32 | 5.71 | 6.19 | 6.15 | 5.85 | 5.25 | 4.17 | 2.95 | 2.25 | 4.46 |
| AZ | Phoenix | 33 ° 26' N | 112° 1' W | 3.25 | 4.41 | 5.17 | 6.76 | 7.42 | 7.7 | 6.99 | 6.11 | 6.02 | 4.44 | 3.52 | 2.75 | 5.38 |
| CA | Los Angeles | 34° N | 118° W | 3.09 | 4.25 | 5.09 | 6.58 | 7.29 | 7.62 | 7.45 | 6.72 | 6.11 | 4.42 | 3.43 | 2.72 | 5.40 |
| CA | San Francisco | 38° 31' N | 121° 30' W | 2.35 | 3.33 | 4.42 | 5.95 | 6.84 | 7.39 | 7.55 | 6.51 | 5.75 | 3.92 | 2.65 | 2.06 | 4.89 |
| CO | Denver | 39° 45' N | 104° 52' W | 2.25 | 3.2 | 4.32 | 5.61 | 6.11 | 6.71 | 6.5 | 5.86 | 5.47 | 4.01 | 2.59 | 1.98 | 4.55 |
| CT | Hartford | 41° 44' N | 72° 39' W | 1.7 | 2.43 | 3.48 | 4.07 | 5.14 | 5.58 | 5.38 | 5.04 | 4.13 | 2.91 | 1.81 | 1.42 | 3.59 |
| DE | Dover | 39° 8' N | 75° 28' W | 1.85 | 2.62 | 3.6 | 4.33 | 5.44 | 5.91 | 5.64 | 5.3 | 4.38 | 3.23 | 2.21 | 1.66 | 3.84 |
| FL | Miami | 25° 48' N | 80° 16' W | 3.72 | 4.61 | 5.42 | 6.4 | 6.61 | 6.29 | 6.26 | 6.08 | 5.47 | 4.84 | 3.96 | 3.46 | 5.26 |
| GA | Atlanta | 33° 39' N | 84° 26' W | 2.31 | 3.37 | 4.08 | 5.2 | 6.02 | 6.01 | 5.81 | 5.59 | 4.76 | 3.95 | 2.98 | 2.33 | 4.37 |
| HI | Honolulu | 21° 20' N | 157° 55' W | 4.38 | 5.15 | 5.99 | 6.69 | 7.05 | 7.48 | 7.37 | 7.07 | 6.51 | 5.46 | 4.41 | 4.01 | 5.96 |
| IA | Dubuque | 42° 24' N | 90° 42' W | 1.64 | 2.58 | 3.34 | 4.57 | 5.54 | 6.06 | 5.81 | 5.26 | 4.33 | 3.03 | 1.72 | 1.35 | 3.77 |
| ID | Boise | 43° 34' N | 116° 13' W | 1.73 | 2.72 | 3.77 | 5.22 | 5.9 | 6.57 | 7.17 | 6.12 | 5.28 | 3.29 | 1.74 | 1.46 | 4.24 |
| IN | Indianapolis | 39° 44' N | 86° 17' W | 1.67 | 2.59 | 3.28 | 4.67 | 5.46 | 6.11 | 5.79 | 5.37 | 4.76 | 3.33 | 1.97 | 1.46 | 3.87 |
| IL | Chicago | 41° 53' N | 87° 38' W | 1.5 | 2.45 | 3.2 | 4.48 | 5.56 | 6.07 | 5.68 | 5.27 | 4.51 | 3.07 | 1.69 | 1.26 | 3.72 |
| KS | Kansas City | 39° 12' N | 94° 36' W | 2.06 | 2.89 | 3.62 | 4.92 | 5.58 | 6.17 | 6.21 | 5.59 | 4.9 | 3.49 | 2.2 | 1.75 | 4.11 |
| KY | Louisville | 38° 11' N | 85° 44' W | 1.71 | 2.65 | 3.32 | 4.73 | 5.38 | 6.08 | 5.79 | 5.35 | 4.8 | 3.42 | 2.1 | 1.56 | 3.9 |
| LA | New Orleans | 29° 37' N | 90° 5' W | 2.64 | 3.73 | 4.67 | 5.8 | 6.6 | 6.15 | 6.09 | 5.7 | 5.13 | 4.48 | 3.49 | 2.68 | 4.76 |
| MA | Boston | 42° 22' N | 71° 2' W | 1.66 | 2.5 | 3.51 | 4.13 | 5.11 | 5.47 | 5.44 | 5.05 | 4.12 | 2.84 | 1.74 | 1.4 | 3.58 |
| MD | Annapolis | 38° 35' N | 76° 21' W | 1.96 | 2.8 | 3.71 | 4.55 | 5.54 | 6.03 | 5.77 | 5.34 | 4.48 | 3.4 | 2.37 | 1.81 | 3.98 |
| ME | Portland | 45° 36' N | 122° 36' W | 1.38 | 2.33 | 3.49 | 4.57 | 5.46 | 6.09 | 6.64 | 5.78 | 4.8 | 2.79 | 1.41 | 1.1 | 3.82 |
| MI | Detroit | 42° 25' N | 83° 1' W | 1.43 | 2.33 | 3.19 | 4.34 | 5.44 | 5.98 | 5.64 | 4.99 | 4.25 | 2.73 | 1.52 | 1.14 | 3.58 |
| MO | St.Louis | 38° 45' N | 90° 23' W | 2.02 | 2.82 | 3.52 | 4.97 | 5.56 | 6.21 | 6.05 | 5.63 | 4.91 | 3.55 | 2.21 | 1.73 | 4.09 |
| MN | Minneapolis | 44° 53' N | 93° 13' W | 1.6 | 2.61 | 3.3 | 4.55 | 5.44 | 5.86 | 5.77 | 5.12 | 4.12 | 2.9 | 1.62 | 1.34 | 3.68 |
| MS | Jackson | 42° 16' N | 84° 28' W | 1.47 | 2.41 | 3.22 | 4.33 | 5.46 | 5.93 | 5.57 | 4.99 | 4.3 | 2.78 | 1.55 | 1.17 | 3.59 |
| MT | Billings | 45° 48' N | 108° 32' W | 1.55 | 2.57 | 3.52 | 4.82 | 5.63 | 6.45 | 6.39 | 5.75 | 4.67 | 3.19 | 1.77 | 1.3 | 3.96 |
| MT | Great Falls | 43° 33' N | 96° 42' W | 1.3 | 2.36 | 3.41 | 4.84 | 5.56 | 6.18 | 6.44 | 5.53 | 4.4 | 2.9 | 1.53 | 1.11 | 3.79 |
| NC | Charlotte | 35° 13' N | 80° 56' W | 2.22 | 3.17 | 3.95 | 4.98 | 5.8 | 6.01 | 5.76 | 5.27 | 4.58 | 3.75 | 2.76 | 2.21 | 4.2 |
| ND | Fargo | 46° 54' N | 96° 48' W | 1.44 | 2.39 | 3.36 | 4.79 | 5.62 | 5.82 | 5.94 | 5.14 | 4.01 | 2.83 | 1.59 | 1.31 | 3.68 |
| NE | Omaha | 41° 18' N | 95° 54' W | 1.92 | 2.76 | 3.45 | 4.74 | 5.6 | 6.14 | 6.11 | 5.46 | 4.74 | 3.34 | 2 | 1.57 | 3.98 |
| NH | Manchester | 42° 56' N | 71° 26' W | 1.66 | 2.5 | 3.51 | 4.13 | 5.11 | 5.47 | 5.44 | 5.05 | 4.12 | 2.84 | 1.74 | 1.4 | 3.58 |
| NJ | Trenton | 40° 13' N | 74° 46' W | 1.71 | 2.39 | 3.43 | 4.04 | 5.26 | 5.67 | 5.39 | 5.14 | 4.18 | 3 | 1.98 | 1.48 | 3.63 |
| NM | Albuquerque | 35° 3' N | 106° 37' W | 2.92 | 3.97 | 4.92 | 6.3 | 6.68 | 6.94 | 6.66 | 5.8 | 5.68 | 4.18 | 3.16 | 2.5 | 4.97 |
| NV | Las Vegas | 36° 18' N | 115° 16' W | 3.02 | 4.13 | 5.05 | 6.57 | 7.25 | 7.69 | 7.37 | 6.42 | 6.08 | 4.26 | 3.18 | 2.6 | 5.3 |
| NY | New York | 41° N | 74° W | 1.67 | 2.37 | 3.41 | 3.93 | 5.11 | 5.48 | 5.26 | 5.01 | 4.05 | 2.85 | 1.82 | 1.4 | 3.53 |
| OH | Columbus | 39° 16' N | 85° 54' W | 1.64 | 2.57 | 3.26 | 4.63 | 5.4 | 6.08 | 5.73 | 5.29 | 4.74 | 3.29 | 1.96 | 1.45 | 3.83 |
| OK | Tulsa | 36° 12' N | 95° 54' W | 2.33 | 3.22 | 3.9 | 5.25 | 5.58 | 6.32 | 6.4 | 5.8 | 5.08 | 3.8 | 2.62 | 2.06 | 4.36 |
| OR | Portland | 45° 32' N | 122° 40' W | 1.38 | 2.33 | 3.49 | 4.57 | 5.46 | 6.09 | 6.64 | 5.78 | 4.8 | 2.79 | 1.41 | 1.1 | 3.82 |
| PA | Philadelphia | 39° 53' N | 75° 15' W | 1.85 | 2.62 | 3.6 | 4.33 | 5.44 | 5.91 | 5.64 | 5.3 | 4.38 | 3.23 | 2.21 | 1.66 | 3.84 |
| PA | Pittsburgh | 40° 27' N | 79° 57' W | 1.59 | 2.4 | 3.26 | 4.07 | 5.05 | 5.53 | 5.27 | 4.94 | 4.05 | 2.88 | 1.86 | 1.41 | 3.53 |
| RI | Providence | 41° 44' N | 71° 26' W | 1.7 | 2.46 | 3.53 | 4.2 | 5.17 | 5.67 | 5.48 | 5.08 | 4.21 | 2.97 | 1.8 | 1.43 | 3.64 |
| SC | Columbia | 38° 58' N | 92° 22' W | 2.14 | 2.91 | 3.62 | 5.03 | 5.56 | 6.22 | 6.13 | 5.64 | 4.95 | 3.57 | 2.25 | 1.82 | 4.15 |
| SD | Sioux Falls | 45° 27' N | 98° 25' W | 1.72 | 2.71 | 3.31 | 4.65 | 5.61 | 6.1 | 6.04 | 5.42 | 4.47 | 3.2 | 1.78 | 1.43 | 3.87 |
| TN | Nashville | 36° 7' N | 86° 41' W | 1.94 | 2.9 | 3.54 | 4.76 | 5.57 | 5.9 | 5.86 | 5.62 | 4.63 | 3.53 | 2.45 | 1.82 | 4.04 |
| TX | San Antonio | 29° 32' N | 98° 28' W | 2.57 | 3.7 | 4.43 | 5.54 | 5.94 | 6.62 | 6.49 | 6.28 | 5.7 | 4.67 | 3.43 | 2.62 | 4.83 |
| TX | Houston | 29° 59' N | 95° 22' W | 2.47 | 3.5 | 4.4 | 5.59 | 6.03 | 6.45 | 6.36 | 6.07 | 5.46 | 4.61 | 3.3 | 2.44 | 4.72 |
| UT | Salt Lake City | 40° 46' N | 111' 52' W | 2.23 | 3.15 | 4.09 | 5.57 | 6.26 | 6.98 | 6.86 | 5.98 | 5.39 | 3.68 | 2.29 | 1.97 | 4.53 |
| VA | Washington | 38° 51' N | 77° 2' W | 1.95 | 2.8 | 3.66 | 4.46 | 5.42 | 5.88 | 5.63 | 5.22 | 4.38 | 3.36 | 2.34 | 1.79 | 3.9 |
| VT | Montpelier | 44° 16' N | 72° 35' W | 1.58 | 2.54 | 3.5 | 4.05 | 5 | 5.24 | 5.37 | 4.92 | 3.79 | 2.46 | 1.52 | 1.28 | 3.43 |
| WA | Seattle | 47° 32' N | 122° 18' W | 1.14 | 2.04 | 3.23 | 4.26 | 5.19 | 5.75 | 6.27 | 5.46 | 4.43 | 2.5 | 1.21 | 0.9 | 3.53 |
| WI | Milwaukee | 42° 57' N | 87° 54' W | 1.43 | 2.41 | 3.29 | 4.48 | 5.6 | 6.09 | 5.74 | 5.21 | 4.34 | 2.9 | 1.6 | 1.2 | 3.69 |
| WV | Charleston | 38° 22' N | 81° 36' W | 1.75 | 2.64 | 3.34 | 4.26 | 5.2 | 5.67 | 5.49 | 5.19 | 4.26 | 3.19 | 2.15 | 1.62 | 3.73 |
| WY | Casper | 42° 55' N | 106° 28' W | 1.93 | 2.8 | 3.79 | 5.13 | 5.9 | 6.68 | 6.5 | 5.9 | 5.13 | 3.59 | 2.06 | 1.65 | 4.25 |
Data courtesy of: NASA - Surface meteorology and Solar Energy Data Set
Reference:
Whitlock, C. E., et al., Release 3 NASA Surface Meteorology and
Solar Energy Data Set for Renewable Energy Industry Use.
Rise & Shine 2000, the 26th Annual Conference of the Solar
Energy Society of Canada Inc. and Solar, Oct. 21-24, 2000,
Halifax, Nova Scotia, Canada.
Please note: If your region is not listed please visit the NASA website where you can search for insolation value for any areas of the world. You will need to obtain a free username and password to gain access.
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