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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