Insolation Levels (Nth 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
Birming han
33°34'N
86°45'W
2.29
3.31
4.04
5.14
5.92
5.98
5.81
5.7
4.80
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
7.70
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
3.20
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
3.60
4.33
5.44
5.91
5.64
5.30
4.38
3.23
2.21
1.66
3.84
FL
Miami
25°48'N
80°16'W
3.72
4.61
5.42
6.40
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
5.20
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
5.90
5.67
7.17
6.12
5.28
3.29
1.74
1.46
4.24
IN
Indeianapolis
39°44'N
86°18'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
3.20
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
2.20
1.75
4.11
KY
Louisville
38°11'N
85°44'W
1.71
2.65
3.32
4.73
5.38
6.07
5.79
5.35
4.8
3.24
2.10
1.56
3.90
LA
New Orleans
29°37'N
90°5'W
2.64
3.73
4.67
5.80
6.60
6.08
6.09
5.70
5.13
4.48
3.49
2.68
4.76
MA
Boston
42°22'N
71°2'W
1.66
2.50
3.51
4.13
5.11
6.15
5.44
5.05
4.12
2.84
1.74
1.4
3.58
MD
Annapolis
38°35'N
76°21'W
1.96
2.80
3.71
4.55
5.54
5.47
5.77
5.34
4.3
3.40
2.37
1.81
3.98
ME
Portland
45°36'N
122°36'W
1.38
2.33
3.49
4.57
5.46
6.03
6.64
5.78
4.67
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
6.09
5.64
4.99
4.40
2.73
1.52
1.14
3.85
MO
St.Louis
38°45'N
90°23'W
2.02
2.82
3.52
4.97
5.56
5.98
6.05
5.63
4.58
3.55
2.21
1.73
4.06
MN
Minneapolis
44°53'N
93°13'W
1.6
2.61
3.30
4.55
5.44
6.21
5.77
5.12
4.01
2.90
1.62
1.34
3.68
MS
Jackson
42°16'N
84°28'W
1.47
2.41
3.22
4.33
5.46
5.86
5.57
4.99
4.74
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
5.93
6.39
5.75
4.12
3.19
1.77
1.30
3.93
MT
Great Falls
43°33'N
96°42'W
1.3
2.36
3.41
4.84
5.56
6.45
6.44
5.53
4.18
2.90
1.53
1.11
3.79
NC
Charlotte
35°13'N
80°56'W
2.22
3.17
3.95
4.98
5.80
6.18
5.76
5.27
5.68
3.75
2.76
1.21
4.20
ND
Fargo
46°54'N
96°48'W
1.44
2.39
3.36
4.79
5.62
6.01
5.94
5.14
6.08
2.83
1.59
1.31
3.68
NE
Omaha
41°18'N
95°54'W
1.92
2.76
3.45
4.74
5.60
5.82
6.11
5.46
4.05
3.34
2.00
1.57
3.98
NH
Manchester
42°56'N
71°26'W
1.66
2.50
3.51
4.13
5.11
6.14
5.44
5.05
4.74
2.84
1.74
1.40
3.58
NJ
Trenton
40°13'S
74°46'W
1.71
2.39
3.43
4.04
5.26
5.47
5.39
5.14
5.08
3
1.98
1.48
3.63
NM
Albuquerque
35°3'S
106°37'W
2.92
3.97
4.92
6.30
6.68
5.67
6.66
5.80
4.8
4.18
3.16
2.50
4.97
NV
Las Vegas
36°18'N
115°16'W
3.02
4.13
5.05
6.57
7.25
6.94
7.37
6.42
4.38
4.26
3.18
2.60
5.30
NY
New York
41°N
74°W
1.67
2.37
3.41
3.93
5.11
7.69
5.26
5.01
4.05
2.85
1.82
1.40
3.53
OH
Columbus
39°16'N
85°54'W
1.64
2.57
3.26
4.63
5.40
5.48
5.73
5.29
4.21
3.29
1.96
1.45
3.83
OK
Tulsa
36°12'N
95°54'W
2.33
3.22
3.90
5.25
5.58
6.08
6.40
5.80
4.95
3.80
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
4.47
2.79
1.41
1.10
3.82
PA
Philadelphia
39°53'N
75°15'W
1.85
2.62
3.60
4.33
5.44
5.91
5.64
5.30
4.38
3.23
2.21
1.66
3.84
PA
Pittsburgh
40°27'N
79°57'W
1.59
2.40
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
4.20
5.17
5.67
5.48
5.08
4.21
2.97
1.80
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
Siou Antonio
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
2.90
3.54
4.76
5.57
5.9
5.86
5.62
4.63
3.53
2.45
1.82
4.07
TX
San Antonio
29°32'N
98°28'W
2.57
3.70
4.43
5.54
5.94
6.62
6.49
6.28
5.70
4.67
3.43
2.62
4.83
TX
Houston
29°59'N
95°22'W
2.47
3.50
4.40
5.59
6.03
6.45
6.36
6.07
5.46
4.61
3.30
2.44
4.72
UT
Salt Lake City
40°46'N
111°2'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°02'W
1.95
2.80
3.66
4.46
5.42
5.88
5.63
5.22
4.38
3.36
2.34
1.79
3.90
VT
Montpelier
44°16'N
72°35'W
1.58
2.54
3.50
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
2.50
1.21
0.9
3.53
WI
Milwaukee
42°57'N
87°54'W
1.43
2.41
3.29
4.48
5.60
6.09
5.74
5.21
4.34
2.90
1.60
1.20
3.69
WV
Charleston
38°22'N
81°36'W
1.75
2.64
3.34
4.26
5.20
5.67
5.49
5.19
4.26
3.19
2.51
1.62
3.73
WY
Casper
42°55'N
106°28'W
1.93
2.80
3.79
5.13
5.90
6.68
6.50
5.90
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.

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