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Insolation Levels In North America

10 year average insolation (kwh/m2/day)

StateCityLatitudeLongitudeJanFebMarAprMayJunJulAugSepOctNovDecYear Avg
ALBirmingham33° 34′ N86° 45′ W2.293.314.045.145.925.985.815.74.83.932.962.254.34
AKAnchorage61° 10′ N150° 1′ W0.210.761.683.123.984.584.253.161.980.980.370.122.09
ARLittle Rock32° 25′ N94° 44′ W2.363.394.015.325.716.196.155.855.254.172.952.254.46
AZPhoenix33 ° 26′ N112° 1′ W3.254.415.176.767.427.76.996.116.024.443.522.755.38
CALos Angeles34° N118° W3.094.255.096.587.297.627.456.726.114.423.432.725.40
CASan Francisco38° 31′ N121° 30′ W2.353.334.425.956.847.397.556.515.753.922.652.064.89
CODenver39° 45′ N104° 52′ W2.253.24.325.616.116.716.55.865.474.012.591.984.55
CTHartford41° 44′ N72° 39′ W1.72.433.484.075.145.585.385.044.132.911.811.423.59
DEDover39° 8′ N75° 28′ W1.852.623.64.335.445.915.645.34.383.232.211.663.84
FLMiami25° 48′ N80° 16′ W3.724.615.426.46.616.296.266.085.474.843.963.465.26
GAAtlanta33° 39′ N84° 26′ W2.313.374.085.26.026.015.815.594.763.952.982.334.37
HIHonolulu21° 20′ N157° 55′ W4.385.155.996.697.057.487.377.076.515.464.414.015.96
IADubuque42° 24′ N90° 42′ W1.642.583.344.575.546.065.815.264.333.031.721.353.77
IDBoise43° 34′ N116° 13′ W1.732.723.775.225.96.577.176.125.283.291.741.464.24
INIndianapolis39° 44′ N86° 17′ W1.672.593.284.675.466.115.795.374.763.331.971.463.87
ILChicago41° 53′ N87° 38′ W1.52.453.24.485.566.075.685.274.513.071.691.263.72
KSKansas City39° 12′ N94° 36′ W2.062.893.624.925.586.176.215.594.93.492.21.754.11
KYLouisville38° 11′ N85° 44′ W1.712.653.324.735.386.085.795.354.83.422.11.563.90
LANew Orleans29° 37′ N90° 5′ W2.643.734.675.86.66.156.095.75.134.483.492.684.76
MABoston42° 22′ N71° 2′ W1.662.53.514.135.115.475.445.054.122.841.741.43.58
MDAnnapolis38° 35′ N76° 21′ W1.962.83.714.555.546.035.775.344.483.42.371.813.98
MEPortland45° 36′ N122° 36′ W1.382.333.494.575.466.096.645.784.82.791.411.13.82
MIDetroit42° 25′ N83° 1′ W1.432.333.194.345.445.985.644.994.252.731.521.143.58
MOSt.Louis38° 45′ N90° 23′ W2.022.823.524.975.566.216.055.634.913.552.211.734.09
MNMinneapolis44° 53′ N93° 13′ W1.62.613.34.555.445.865.775.124.122.91.621.343.68
MSJackson42° 16′ N84° 28′ W1.472.413.224.335.465.935.574.994.32.781.551.173.59
MTBillings45° 48′ N108° 32′ W1.552.573.524.825.636.456.395.754.673.191.771.33.96
MTGreat Falls43° 33′ N96° 42′ W1.32.363.414.845.566.186.445.534.42.91.531.113.79
NCCharlotte35° 13′ N80° 56′ W2.223.173.954.985.86.015.765.274.583.752.762.214.20
NDFargo46° 54′ N96° 48′ W1.442.393.364.795.625.825.945.144.012.831.591.313.68
NEOmaha41° 18′ N95° 54′ W1.922.763.454.745.66.146.115.464.743.3421.573.98
NHManchester42° 56′ N71° 26′ W1.662.53.514.135.115.475.445.054.122.841.741.43.58
NJTrenton40° 13′ N74° 46′ W1.712.393.434.045.265.675.395.144.1831.981.483.63
NMAlbuquerque35° 3′ N106° 37′ W2.923.974.926.36.686.946.665.85.684.183.162.54.97
NVLas Vegas36° 18′ N115° 16′ W3.024.135.056.577.257.697.376.426.084.263.182.65.30
NYNew York41° N74° W1.672.373.413.935.115.485.265.014.052.851.821.43.53
OHColumbus39° 16′ N85° 54′ W1.642.573.264.635.46.085.735.294.743.291.961.453.83
OKTulsa36° 12′ N95° 54′ W2.333.223.95.255.586.326.45.85.083.82.622.064.36
ORPortland45° 32′ N122° 40′ W1.382.333.494.575.466.096.645.784.82.791.411.13.82
PAPhiladelphia39° 53′ N75° 15′ W1.852.623.64.335.445.915.645.34.383.232.211.663.84
PAPittsburgh40° 27′ N79° 57′ W1.592.43.264.075.055.535.274.944.052.881.861.413.53
RIProvidence41° 44′ N71° 26′ W1.72.463.534.25.175.675.485.084.212.971.81.433.64
SCColumbia38° 58′ N92° 22′ W2.142.913.625.035.566.226.135.644.953.572.251.824.15
SDSioux Falls45° 27′ N98° 25′ W1.722.713.314.655.616.16.045.424.473.21.781.433.87
TNNashville36° 7′ N86° 41′ W1.942.93.544.765.575.95.865.624.633.532.451.824.04
TXSan Antonio29° 32′ N98° 28′ W2.573.74.435.545.946.626.496.285.74.673.432.624.83
TXHouston29° 59′ N95° 22′ W2.473.54.45.596.036.456.366.075.464.613.32.444.72
UTSalt Lake City40° 46′ N111′ 52′ W2.233.154.095.576.266.986.865.985.393.682.291.974.53
VAWashington38° 51′ N77° 2′ W1.952.83.664.465.425.885.635.224.383.362.341.793.90
VTMontpelier44° 16′ N72° 35′ W1.582.543.54.0555.245.374.923.792.461.521.283.43
WASeattle47° 32′ N122° 18′ W1.142.043.234.265.195.756.275.464.432.51.210.93.53
WIMilwaukee42° 57′ N87° 54′ W1.432.413.294.485.66.095.745.214.342.91.61.23.69
WVCharleston38° 22′ N81° 36′ W1.752.643.344.265.25.675.495.194.263.192.151.623.73
WYCasper42° 55′ N106° 28′ W1.932.83.795.135.96.686.55.95.133.592.061.654.25

Data courtesy ofNASA – 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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