SOLAR INSOLATION
This chart shows solar insolation in kilowatt-hours per square meter per day in many U.S. locations. For simplicity, we
call this figure “sun-hours/day”. To find average sun-hours per day in your area (line 3), check local weather data,
look at the map on the previous page or find a city in the table below that has similar weather to your location.
If you want year- round autonomy, use the lowest of the two figures. If you want only 100% autonomy in summer, use
the higher figure.
State |
City |
High |
Low |
Avg |
AK |
Fairbanks |
5.87 |
2.12 |
3.99 |
AK |
Matanuska |
5.24 |
1.74 |
3.55 |
AL |
Montgomery |
4.69 |
3.37 |
4.23 |
AR |
Bethel |
6.29 |
2.37 |
3.81 |
AR |
Little Rock |
5.29 |
3.88 |
4.69 |
AZ |
Tuscon |
7.42 |
6.01 |
6.57 |
AZ |
Page |
7.3 |
5.65 |
6.36 |
AZ |
Pheonix |
7.13 |
5.78 |
6.58 |
CA |
Santa Maria |
6.52 |
5.42 |
5.94 |
CA |
Riverside |
6.35 |
5.35 |
5.87 |
CA |
Davis |
6.09 |
3.31 |
5.1 |
CA |
Fresno |
6.19 |
3.42 |
5.38 |
CA |
Los Angeles |
6.14 |
5.03 |
5.62 |
CA |
Soda Springs |
6.47 |
4.4 |
5.6 |
CA |
La Jolla |
5.24 |
4.29 |
4.77 |
CA |
Inyokern |
8.7 |
6.87 |
7.66 |
CO |
Grandby |
7.47 |
5.15 |
5.69 |
CO |
Grand Lake |
5.86 |
3.56 |
5.08 |
CO |
Grand Junction |
6.34 |
5.23 |
5.85 |
CO |
Boulder |
5.72 |
4.44 |
4.87 |
DC |
Washington |
4.69 |
3.37 |
4.23 |
FL |
Aplachicola |
5.98 |
4.92 |
5.49 |
FL |
Belie Island |
5.31 |
4.58 |
4.99 |
FL |
Miami |
6.26 |
5.05 |
5.62 |
FL |
Gainsville |
5.81 |
4.71 |
5.27 |
FL |
Tampa |
6.16 |
5.26 |
5.67 |
GA |
Atlanta |
5.16 |
4.09 |
4.74 |
GA |
Griffin |
5.41 |
4.26 |
4.99 |
HI |
Honolulu |
6.71 |
5.59 |
6.02 |
IA |
Ames |
4.8 |
3.73 |
4.4 |
ID |
Boise |
5.83 |
3.33 |
4.92 |
ID |
Twin Falls |
5.42 |
3.42 |
4.7 |
IL |
Chicago |
4.08 |
1.47 |
3.14 |
IN |
Indianapolis |
5.02 |
2.55 |
4.21 |
|
State |
City |
High |
Low |
Avg |
KS |
Manhattan |
5.08 |
3.62 |
4.57 |
KS |
Dodge City |
6.5 |
4.2 |
5.6 |
KY |
Lexington |
5.97 |
3.6 |
4.94 |
LA |
Lake Charles |
5.73 |
4.29 |
4.93 |
LA |
New Orleans |
5.71 |
3.63 |
4.92 |
LA |
Shreveport |
4.99 |
3.87 |
4.63 |
MA |
East Wareham |
4.48 |
3.06 |
3.99 |
MA |
Boston |
4.27 |
2.99 |
3.84 |
MA |
Blue Hill |
4.38 |
3.33 |
4.05 |
MA |
Natick |
4.62 |
3.09 |
4.1 |
MA |
Lynn |
4.6 |
2.33 |
3.79 |
MD |
Silver Hill |
4.71 |
3.84 |
4.47 |
ME |
Caribou |
5.62 |
2.57 |
4.19 |
ME |
Portland |
5.23 |
3.56 |
4.51 |
MI |
Sault Saint Marie |
4.83 |
2.33 |
4.2 |
MI |
East Lansing |
4.71 |
2.7 |
4.0 |
MN |
St. Cloud |
5.43 |
3.53 |
4.53 |
MO |
Columbia |
5.5 |
3.97 |
4.73 |
MO |
St. Louis |
4.87 |
3.24 |
4.38 |
MS |
Meridian |
4.86 |
3.64 |
4.43 |
MT |
Glasgow |
5.97 |
4.09 |
5.15 |
MT |
Great Falls |
5.7 |
3.66 |
4.93 |
MT |
Summit |
5.17 |
2.36 |
3.99 |
NM |
Albuquerque |
7.16 |
6.21 |
6.77 |
NB |
Lincoln |
5.4 |
4.38 |
4.79 |
NB |
North Omaha |
5.28 |
4.26 |
4.9 |
NC |
Cape Hatteras |
5.81 |
4.69 |
5.31 |
NC |
Greensboro |
5.05 |
4 |
4.71 |
ND |
Bismark |
5.48 |
3.97 |
5.01 |
NJ |
Sea Brook |
4.76 |
3.2 |
4.21 |
NV |
Las Vegas |
7.13 |
5.84 |
6.41 |
NV |
Ely |
6.48 |
5.49 |
5.98 |
NY |
Binghampton |
3.93 |
1.62 |
3.16 |
NY |
Ithica |
4.57 |
2.29 |
3.79 |
|
State |
City |
High |
Low |
Avg |
NY |
Schenetady |
3.92 |
2.53 |
3.55 |
NY |
Rochester |
4.22 |
1.58 |
3.31 |
NY |
New York City |
4.97 |
3.03 |
4.08 |
OH |
Columbus |
5.26 |
2.66 |
4.15 |
OH |
Cleveland |
4.79 |
2.69 |
3.94 |
OK |
Stillwater |
5.52 |
4.22 |
4.99 |
OK |
Oklahoma City |
6.26 |
4.98 |
5.59 |
OR |
Astoria |
4.76 |
1.99 |
3.72 |
OR |
Corvallis |
5.71 |
1.9 |
4.03 |
OR |
Medford |
5.84 |
2.02 |
4.51 |
PA |
Pittsburg |
4.19 |
1.45 |
3.28 |
PA |
State College |
4.44 |
2.79 |
3.91 |
RI |
Newport |
4.69 |
3.58 |
4.23 |
SC |
Charleston |
5.72 |
4.23 |
5.06 |
SD |
Rapid City |
5.91 |
4.56 |
5.23 |
TN |
Nashville |
5.2 |
3.14 |
4.45 |
TN |
Oak Ridge |
5.06 |
3.22 |
4.37 |
TX |
San Antonio |
5.88 |
4.65 |
5.3 |
TX |
Brownsville |
5.49 |
4.42 |
4.92 |
TX |
El Paso |
7.42 |
5.87 |
6.72 |
TX |
Midland |
6.33 |
5.23 |
5.83 |
TX |
Fort Worth |
6 |
4.8 |
5.43 |
UT |
Salt Lake City |
6.09 |
3.78 |
5.26 |
UT |
Flaming Gorge |
6.63 |
5.48 |
5.83 |
VA |
Richmond |
4.5 |
3.37 |
4.13 |
WA |
Seattle |
4.83 |
1.6 |
3.57 |
WA |
Richland |
6.13 |
2.01 |
4.44 |
WA |
Pullman |
6.07 |
2.9 |
4.73 |
WA |
Spokane |
5.53 |
1.16 |
4.48 |
WA |
Prosser |
6.21 |
3.06 |
5.03 |
WI |
Madison |
4.85 |
3.28 |
4.29 |
WV |
Charleston |
4.12 |
2.47 |
3.65 |
WY |
Lander |
6.81 |
5.5 |
6.06 |
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