Insolation (Incoming Solar Radiation) is the amount of solar radiation incident on any surface – for our purposes, we will be comparing insolation levels on the surface of the Earth. The amount of insolation received at the surface of the Earth is controlled by the angle of the sun, the state of the atmosphere, altitude, and geographic location.

The values of solar insolation are commonly expressed in kWh/m 2/day. This is the amount of solar energy that strikes a square meter of the earth’s surface in a single day.

Insolation levels are used to determine what size solar collector is needed to efficiently provide adequate levels of hot water. Geographic locations with low insolation levels require larger collectors than locations with higher insolation levels.

For comparison, consider the average annual insolation levels of these two extreme locations:
*Oslo , Norway = 2.27 kWh/m 2/day (very low)

*Miami , Florida = 5.26 kWh/m 2/day (very high)

For more information on the science of solar insolation, refer to Wikipedia’s page http://en.wikipedia.org/wiki/Insolation.


Select a Region:
 
RegionStateCityLatitudeLongitudeJanFebMarAprMayJuneJulAugSeptOctNovDecYearAverage
Africa SL freetown 8 29' N 13 14' W 5.19 5.91 6.08 5.47 4.76 4.09 3.6 3.58 4.25 4.84 4.93 4.94 4.8
Africa SD al khur-tum 15 33' N 32 32' E 5.46 6.19 6.75 7.25 6.85 6.96 6.52 6.35 6.42 6.17 5.66 5.22 6.31
Africa NG abuja 9 12' N 7 11' E 5.57 6.33 6.22 6.1 5.89 5.47 4.92 4.65 5.12 5.82 5.81 5.42 5.61
Africa NE niamey 13 30' N 2 12' W 5.42 6.39 6.72 6.79 6.75 6.31 6.07 5.78 6.07 6.16 5.79 5.29 6.12
Africa MR nouakchott 17 45' N 15 45' E 5.31 6.21 6.8 7.54 7.57 7.63 7.2 6.9 6.78 6.34 5.49 4.88 6.55
Africa ML bamako 12 30' N 7 54' E 5.61 6.35 6.64 6.78 6.42 6.47 5.87 5.65 6.04 6.13 5.85 5.36 6.09
Africa LY tarabulus 32 54' N 13 11' E 3.1 4.03 5.19 6.48 6.89 7.77 8.11 7.45 6.12 4.58 3.35 2.76 5.48
Africa MA rabat 32 32' N 9 17' W 3.13 3.86 5.09 6.08 6.89 7.31 7.34 6.8 5.69 4.37 3.25 2.82 5.21
Africa LR liberia 6 30' N 9 30' W 5.43 5.72 5.59 5.31 5.11 4.61 4.25 4.19 4.67 5.13 5.24 5.2 5.03
Africa KE nairobi 1 16' S 36 48' E 6.05 6.24 6.07 5.7 5.42 5.14 4.88 5.09 5.78 6.03 5.48 5.6 5.62
Africa GN conakry 9 36' N 13 36' E 5.81 6.41 6.51 6.22 5.69 5.69 5.09 5.05 5.46 5.87 5.98 5.6 5.78
Africa GM gambia 13 28' N 16 39' W 5.01 5.93 6.67 6.92 6.72 6.06 5.48 5.09 5.3 5.67 5.36 4.95 5.76
Africa ET addis abeba 9 2' N 38 42' E 5.96 5.8 6.23 6.31 6.11 5.79 5.03 5 5.64 6.31 6.15 5.75 5.84
Africa GH accra 5 36` N 0 12` W 5.65 6.01 5.65 5.33 5 4.49 4.5 4.59 4.67 5.25 5.7 5.55 5.2
Africa EG Cairo 29 35' N 31 09' E 3.39 4.17 5.24 6.49 7.11 8 7.88 7.4 6.42 5.07 3.86 3.19 5.68
Africa DZ alger 36 50' N 3 E 2.22 2.94 3.87 5 5.88 6.69 7.23 6.48 5.15 3.53 2.43 2.02 4.45
Africa CM Yaounde 3 48' N 11 30' W 4.94 5.38 5.16 4.68 4.46 4.42 5.17 5.07 5.03 5.4 5.29 4.83 4.98
Africa DJ djibouti 11 33' N 43 09' E 5.6 5.77 6.59 6.81 6.85 6.87 6.46 6.47 6.56 6.77 6.22 5.55 6.37
Africa CF Bangui 18 32' N 120 36' E 4.13 4.97 5.99 6.61 6.17 5.53 5.73 4.87 5.07 4.55 4.07 3.81 5.12
Asia Pacific YE Aden 12 50' N 45 02' E 5.45 5.78 6.52 6.48 6.71 6.72 6.33 6.33 6.41 6.54 5.99 5.39 6.22
Asia Pacific VN Hanoi 21 N 105 54' E 2.52 2.94 3.81 4.34 4.66 4.51 4.62 4.62 4.57 3.64 3.29 3.17 3.89
Asia Pacific TR Ankara 39 57' N 32 53' E 1.77 2.38 3.69 4.54 5.53 6.63 6.99 6.55 5.22 3.24 1.99 1.51 4.17
Asia Pacific TH Chiang Mai 18 N 99 E 4.79 5.51 6.11 6.29 5.53 4.44 4.16 4.18 4.5 4.34 4.28 4.48 4.88
Asia Pacific TH Bang Kok 13 45' N 100 30' E 4.42 4.65 4.84 5.03 4.75 3.77 4.22 3.46 3.63 3.89 4.16 4.4 4.27
Asia Pacific SG Singapore City 1 N 103 E 4.43 5.52 5.05 5.05 4.62 4.66 4.51 4.61 4.49 4.5 3.98 3.93 4.61
Asia Pacific SA Riyadh 24 39' N 46 42' E 4.03 4.92 5.56 6.24 7.27 7.99 7.86 7.46 6.83 5.8 4.58 3.82 6.03
Asia Pacific PH Manila 14 37' N 120 58' E 4.82 5.62 6.42 6.75 6.19 4.96 4.94 4.41 4.86 4.63 4.59 4.5 5.22
Asia Pacific PH Cebu 10 19' N 123 54' E 4.53 5.15 5.83 6.25 5.9 4.83 4.76 4.93 4.96 4.75 4.49 4.44 5.07
Asia Pacific OM Mascat 23 37' N 58 37' E 4.34 5 5.85 6.69 7.54 7.56 6.91 6.71 6.55 5.93 4.95 4.23 6.29
Asia Pacific NZ Wellington 41 17' S 174 47' E 6.27 5.31 4.17 3 1.95 1.54 1.74 2.46 3.66 4.7 5.73 6.01 3.88
Asia Pacific NZ Christchurch 43 32s 172 37e 5.9 4.95 3.86 2.75 1.72 1.31 1.47 2.15 3.3 4.34 5.43 5.64 3.57
Asia Pacific NZ Auckland 36 52' S 174 45' E 6.37 5.9 4.71 3.43 2.44 2 2.25 2.95 4.13 5.23 6.05 6.56 4.34
Asia Pacific MY Kuala Lumpur 3 07' N 101 42' E 4.54 5.27 5.14 5.05 4.8 4.98 4.91 4.78 4.54 4.51 4.23 4.07 4.7
Asia Pacific MN Ulaanbaatar 47 55' N 106 54' E 1.79 2.77 4.24 5.53 6.26 6.15 5.55 4.88 4.17 3 1.82 1.4 4.3
Asia Pacific MM Yangon 16 47' N 96 09' E 5.4 6.06 6.65 6.69 5.14 3.24 3.3 2.99 4.12 4.51 4.82 5.05 4.65
Asia Pacific LB Beirut 33 54N 35 28E 2.64 3.4 4.63 6.03 6.96 7.9 7.84 7.19 6.13 4.5 3.14 2.44 5.68
Asia Pacific LA Vientiane 18 07' N 102 35' E 4.3 4.94 5.52 5.74 5.11 4.24 4.22 4.19 4.61 4.26 4.21 4.24 4.63
Asia Pacific KR Seoul 37 31' N 127 E 2.62 3.4 4.29 5.24 5.63 5.15 4.26 4.55 3.99 3.64 2.6 2.24 4.16
Asia Pacific KP P' yongyang 39 N 125 18' E 2.5 3.35 4.5 5.17 5.6 5.35 4.51 4.63 4.22 3.51 2.46 2.09 4.2
Asia Pacific KH Phnom penh 11 33' N 104 51' E 5.27 5.78 6.02 5.76 5.09 4.3 4.55 4.07 4.34 4.41 4.88 5.03 4.85
Asia Pacific JP Tokyo 35 45' N 139 38' E 2.31 2.99 3.7 4.9 5.07 4.47 4.88 5.42 3.82 2.98 2.5 2.23 4
Asia Pacific JO Amman 31 57' N 35 57' E 2.93 3.67 4.83 6.04 6.88 7.91 7.86 7.27 6.25 4.71 3.47 2.76 5.8
Asia Pacific IQ Baghdad 33 20' N 44 24' E 2.79 3.64 4.59 5.76 6.83 8.1 7.97 7.29 6.25 4.44 3.04 2.52 5.27
Asia Pacific IN Bangalore 12 57' N 77 37' E 5 5.9 6.44 6.42 6.13 4.76 4.48 4.59 4.98 4.68 4.34 4.4 5.18
Asia Pacific IN Bombay 18 33' N 72 32' E 5.22 6.03 6.66 7.05 6.77 4.59 3.54 3.4 4.72 5.39 5.15 4.8 5.28
Asia Pacific IN New Delhi 28 N 77 E 3.68 4.47 5.5 6.6 7.08 6.55 5.01 4.62 5.11 4.99 4.15 3.42 5.1
Asia Pacific IR Bandar' Abbas 27 15' N 56 15' E 3.63 4.43 5.14 6.29 7.43 7.96 7.41 6.97 6.58 5.51 4.29 3.37 5.75
Asia Pacific IR Mashhad 36 16' N 59 34' E 2.22 2.97 3.88 5.21 6.29 7.49 7.41 6.78 5.7 4.13 2.78 2.06 4.74
Asia Pacific IR Tehran 35 40' N 51 26' E 2.23 2.84 3.72 5.12 5.99 7.32 7.2 6.41 5.59 3.9 2.61 2.02 4.58
Asia Pacific IR Tabriz 38 48' N 46 18' E 1.79 2.4 3.37 4.58 5.54 6.71 6.97 6.06 5.2 3.26 2.14 1.56 4.13
Asia Pacific IL Tel Aviv 32 05' N 34 46' E 2.78 3.5 4.73 6.03 6.86 7.87 7.81 7.22 6.19 4.63 3.32 2.62 5.73
Asia Pacific ID Jakarta 6 11' S 106 50' E 4.15 4.59 5 4.94 4.88 4.71 5.09 5.46 5.66 5.36 4.76 4.47 5.03
Asia Pacific AU Melbourne 37 47' S 144 58' E 6.78 6.22 4.76 3.4 2.29 1.84 2.04 2.79 3.94 5.27 6.28 6.46 4.34
Asia Pacific AU Perth 31 57' S 115 52' E 7.7 6.75 5.41 4.16 3.06 2.67 2.89 3.66 4.76 6.09 7.04 7.76 5.16
Asia Pacific AU Sydney 34 S 151 0' E 6.34 5.68 4.87 3.6 2.74 2.5 2.67 3.53 4.67 5.61 6.32 6.6 4.59
Asia Pacific BD Dhaka 23 42' N 90 22' E 4.44 5.08 5.87 6.06 5.5 4.41 4.09 4.37 4.17 4.5 4.37 4.13 4.75
Asia Pacific CN Beijing 39 55' N 116 25' E 2.37 2.92 3.58 5.61 4.83 5.68 5.42 4.49 4.25 3.2 2.66 2.04 3.92
Asia Pacific CN Nanjing 32 03' N 118 53' E 2.04 2.22 2.65 4.5 3.84 4.47 4.93 4.5 3.67 3.02 2.88 2.08 3.4
Asia Pacific CN Shanghai 31 10' N 121 28' E 2.29 2.63 3.07 4.54 4.38 4.59 5.52 5.23 4.03 3.39 2.97 2.38 4.01
Asia Pacific CN Hongkong 22 18' N 114 10' E 2.59 2.56 3.06 3.93 4.13 4.74 5.81 4.95 4.68 4.05 3.56 2.93 4.18
Asia Pacific AU Brisbane 27 99' S 153 8' E 6.93 6.09 5.44 4.34 3.5 3.29 3.52 4.43 5.62 6.18 6.74 6.93 5.25
Asia Pacific AU Hobart 42 52' S 147 19' E 5.97 5.33 4.05 2.73 1.79 1.44 1.68 2.41 3.6 4.78 5.92 6.18 3.82
Asia Pacific AU Adelaide 34 55' S 138 36' E 7.2 6.58 5.18 3.85 2.65 2.23 2.48 3.2 4.46 5.69 6.59 6.74 4.74
Asia Pacific AE Abu Dhabi 24 28' N 54 22' E 3.92 4.5 5.22 5.87 7.06 7.33 6.9 6.64 6.39 5.53 4.54 3.79 5.64
Canada BF Ouagadougou 12 24' N 1 30' E 5.48 6.43 6.56 6.62 6.53 6.16 5.76 5.48 5.87 6.18 5.83 5.35 6.02
Canada QC Montreal 45 ? 28' N 73 ? 45' W 1.45 2.36 3.41 4.25 4.91 5.42 5.55 4.76 3.52 2.18 1.43 1.21 3.37
Canada SK Regina 45 ? 19' N 65 ? 53' W 1.14 1.96 3.02 4.69 5.48 5.79 6.14 4.96 3.42 2.29 1.3 0.95 3.42
Canada ON Toronto 43 ? 41' N 79 ? 38' W 1.44 2.27 3.19 4.13 5.15 5.83 5.67 4.82 3.66 2.47 1.48 1.2 3.44
Canada NL St. Johns 45 ? 19' N 65 ? 53' W 1.56 2.27 3.48 4.19 4.76 5.05 5.05 4.54 3.53 2.29 1.43 1.27 3.28
Canada NS Halifax 44 ? 39' N 63 ? 34' W 1.56 2.31 3.46 4.09 4.82 5.27 5.41 4.86 3.92 2.54 1.53 1.3 3.42
Canada MB Winnipeg 49 ? 54' N 97 ? 14' W 1.21 2.08 3.27 4.55 5.54 5.8 5 4.84 3.32 2.21 1.33 1.02 3.41
Canada AB Edmonton 53 ? 34' N 113 ? 31' W 1.45 2.36 3.41 4.25 4.91 5.42 5.55 4.76 3.52 2.18 1.43 1.21 3.37
Canada BC Victoria 48 ? 25' N 123 ? 19' W 1 1.82 2.93 4.01 5.13 5.54 5.85 5.28 3.88 2.17 1.11 0.86 3.29
Europe HU Budapest 47 30' N 19 3' E 1 1.71 2.76 3.9 5.03 5.3 5.62 4.84 3.57 2.24 1.17 0.88 3.17
Europe GR Athens 38 N 23 43' E 2 2.52 3.67 5.21 6.38 7.52 7.61 6.91 5.57 3.5 2.16 1.63 4.56
Europe FX Toulouse 43 37' N 1 26' E 1.39 2.14 3.19 4.03 4.82 5.16 5.86 5.07 4.09 2.48 1.58 1.25 3.75
Europe FX Paris 48 52' N 2 20' E 0.89 1.62 2.62 3.95 4.9 4.83 5.35 4.61 3.33 2 1.12 0.72 3.34
Europe FX Lyon 45 46' N 4 50' E 1.26 1.97 3.02 4.08 4.97 5.4 6.03 5.23 3.93 2.27 1.43 1.08 3.74
Europe ES Alicante 38 40' N 0 30' W 2.23 3.02 4.26 5.39 6.13 6.89 7.34 6.53 5.11 3.45 2.34 1.94 4.94
Europe ES Barcelona 41 24' N 2 9' E 1.89 2.71 3.97 4.99 5.82 6.56 7.01 6.07 4.72 3.11 2.04 1.7 4.6
Europe ES Malaga 36 42' N 4 42' W 2.52 3.24 4.51 5.4 6.35 7.09 7.64 6.81 5.39 3.7 2.58 2.14 5.16
Europe ES Madrid 40 25' N 3 41' W 1.93 2.75 4.09 4.83 5.85 6.52 7.11 6.3 4.91 3.07 1.97 1.59 4.62
Europe DE Munich 48 05' N 11 23' E 1.05 1.8 2.82 3.95 4.84 4.65 5.14 4.46 3.2 2 1.02 0.79 2.98
Europe DE Hamburg 53 33' N 9 59' E 0.54 1.11 2.09 3.68 4.86 4.47 4.47 3.89 2.59 1.48 0.69 0.4 2.52
Europe CR Zagreb 45 29' N 15 35' E 1.3 2 2.94 3.91 5.03 5.37 5.93 5.19 3.94 2.39 1.39 1.09 3.72
Europe CY Limassol 34 40' N 33 03' E 2.52 3.26 4.54 6 6.85 7.81 7.8 7.18 6.11 4.43 3.02 2.31 5.61
Europe BG Sofija 42 40' N 23 18' E 1.5 2.04 2.97 4.05 5 5.8 6.29 5.68 4.46 2.75 1.62 1.27 3.99
Europe BE Bruxelles 50 45' N 4 30' E 0.74 1.31 2.29 3.68 4.67 4.48 4.82 4.2 2.86 1.73 0.92 0.56 3.02
Europe AT Vienna 48 13' N 16 22' E 1.1 1.81 2.8 3.76 4.76 5.12 5.72 4.98 3.68 2.15 1.28 0.93 3.52
Europe YU Beograd 44 50' N 20 30' E 1.29 1.89 2.92 3.86 4.88 5.45 6 5.3 4.05 2.5 1.4 1.11 3.39
Europe SZ Lausanne 46 32' N 6 39' E 1.1 1.81 2.8 3.76 4.76 5.12 5.72 4.98 3.68 2.15 1.28 0.93 3.17
Europe SZ Bern 46 57' N 7 26' E 1.1 1.77 2.74 3.6 4.7 5.07 5.68 4.95 3.66 2.18 1.26 0.92 3.14
Europe UK London 51 32' N 0 5' W 0.67 1.26 2.22 3.48 4.54 4.51 4.74 4.01 2.86 1.65 0.89 0.52 2.61
Europe UK Edinburgh 55 55' N 3' 10' W 0.44 0.94 1.86 3.18 4.33 4.34 4.13 3.41 2.43 1.2 0.59 0.32 2.26
Europe UA Odessa 46 30' N 30 46' E 1.08 1.78 2.68 3.87 5.4 5.7 6.39 5.63 3.96 2.45 1.06 0.87 3.41
Europe PT Oviedo 43 21' N 5 50' W 1.67 2.29 3.44 4.59 5.56 6.32 6.86 5.95 4.51 2.71 1.77 1.46 3.93
Europe PT Lisboa 38 42' N 9 11' W 2.27 2.99 4.3 5.15 6.13 6.46 6.89 6.33 5.11 3.44 2.27 1.84 4.43
Europe RO Bucharest 44 26' N 26 06' E 1.36 1.94 2.91 3.94 5.03 5.6 6.15 5.53 4.15 2.59 1.37 1.1 3.47
Europe NO Oslo 59 56' N 10 44' E 0.3 0.87 1.68 3.12 4.65 4.84 4.59 3.36 2.22 1.02 0.42 0.19 2.27
Europe NL Amsterdam 52 21' N 4 54' E 0.61 1.21 2.27 3.76 4.88 4.73 4.78 4.13 2.8 1.6 0.78 0.45 2.67
Europe IT Rome 41 53' N 12 30' E 1.78 2.52 3.71 4.87 5.98 6.84 7.08 6.34 4.83 3.08 1.98 1.56 4.21
Europe IT Milan 45 28' N 9 12' E 1.27 1.89 2.91 3.65 4.84 5.36 5.97 5.21 3.91 2.4 1.42 1.08 3.33
Europe IE Dublin 53 20' N 6 15' W 0.56 1.07 1.97 3.32 4.4 4.3 4.3 3.4 2.69 1.43 0.77 0.43 2.39
South America Brazil Fortaleza 03? 43' S 38? 31' W 5.85 5.44 4.82 4.8 5.11 5.34 5.74 6.34 6.6 6.62 6.5 6.16 5.78
South America Brazil Curitiba 25? 26' S 49? 15' W 5.48 4.88 4.32 3.57 2.95 2.83 2.96 3.47 3.87 4.65 5.44 5.41 4.15
South America Brazil Brasilia 15? 52' S 47? 56' W 5.21 5.15 5.09 4.99 4.8 4.59 4.86 5.46 5.28 5.23 4.97 4.82 5.04
South America Brazil Belo Horizonte 19? 55' S 43? 56' W 5.45 5.63 5.34 4.78 4.3 4.09 4.32 4.82 5.05 5.26 5.25 4.98 4.94
South America Brazil Belem 01? 27' S 48? 29' W 4.54 4.34 4.26 4.46 4.75 4.99 5.27 5.5 5.85 5.79 5.52 4.96 5.02
South America Bolivia Sucre 19? 02' S 65? 15' W 1.67 2.29 3.47 4.58 5.59 6.37 6.86 5.97 4.51 2.73 1.77 1.46 3.94
South America Bolivia Santa Cruz 17? 47' S 63? 10' W 4.57 4.9 4.57 3.92 3.44 3.25 3.44 4.01 4.45 5 5.21 5.01 4.31
South America Bolivia La Paz 16? 29' S 68? 08' W 5.3 5.57 5.16 5.01 4.78 4.37 4.51 4.96 5.66 5.98 6.15 5.92 5.28
South America Argentina Rio Gallegos 51? 37' S 69? 13' W 5.47 4.63 3.32 2.02 1.07 0.71 0.81 1.61 2.87 4.26 5.53 5.79 3.17
South America Argentina Cordoba 31? 24' S 64? 12' W 7.07 6.3 4.9 3.87 3.01 2.65 2.79 3.63 4.76 5.93 6.63 6.96 4.88
South America Argentina Buenos Aires 34? 36' S 58? 23' W 6.44 5.67 4.53 3.53 2.74 2.04 2.31 3.27 4.23 5.12 6.36 6.44 4.39
South America Dominican Rep. Santiago 18? 29' N 69? 54' W 3.89 4.46 5.24 5.53 5.52 5.48 5.41 5.13 4.8 4.46 4.03 3.78 4.81
South America Martinique Fort de France 14? 37' N 61? 05' W 5.35 5.98 6.59 6.94 6.7 6.42 6.49 6.45 6.03 5.87 5.15 5.15 6.09
South America Puerto Rico San Juan 18? 15' N 66? 30' W 4.26 4.9 5.7 6.09 5.89 6.09 6.08 5.78 5.26 4.8 4.36 4.15 5.28
South America Jamaica Kingston 17? 58' N 76? 48' W 4.92 5.67 6.45 6.8 6.5 6.82 6.84 6.61 6.23 5.45 4.76 4.58 5.97
South America Cuba Havana 23? 09' N 82? 21' W 4.09 4.97 5.92 7.06 7.15 7.1 6.9 6.86 6.1 5.12 4.26 3.74 5.77
South America Panama Panama City 08? 58' N 79? 33' W 5.27 5.92 6.23 5.75 4.78 4.11 4.16 4.15 4.24 3.99 4.23 4.66 4.79
South America Nicaragua Managua 12? 10' N 86? 15' W 5.34 5.89 6.59 6.54 5.83 5.67 5.7 5.69 5.43 5.39 5.15 5.05 5.69
South America Mexico Veracruz 19? 10' N 96? 07' W 3.55 4.13 4.86 5.35 5.4 5.12 5.15 5.17 4.66 4.45 3.92 3.43 4.6
South America Mexico Tijuana 32? 32' N 117? 01' W 3.32 4.15 5.23 6.37 6.61 6.43 6.46 6.31 5.4 4.26 3.65 3.08 5.11
South America Mexico Puerto Vallarta 20? 39' N 105? 14' W 4.2 5.29 6.39 7.12 7.51 6.96 6.17 5.99 5.32 5.3 4.82 4 5.76
South America Mexico Oaxaca 17? 04' N 96? 43' W 4.36 4.99 5.74 6.08 5.86 5.01 4.92 4.95 4.43 4.63 4.38 4.08 4.95
South America Mexico Monterrey 25? 40' N 100? 23' W 3.33 4.2 5.4 5.71 6.06 5.89 5.59 5.44 4.76 4.49 3.9 3.23 4.83
South America Mexico Mexico City 19? 26' N 99? 08' W 4.34 5.07 5.89 5.95 5.9 5.03 4.76 4.86 4.57 4.73 4.57 4.29 5
South America Mexico La Paz 24? 09' N 110? 18' W 3.73 4.67 5.75 6.63 7.16 7.07 6.4 6.06 5.52 4.93 4.11 3.51 5.46
South America Mexico Guadalajara 20? 40' N 103? 40' W 4.24 5.18 6.21 6.71 6.89 6 5.23 5.41 5.14 5.11 4.79 4.13 5.42
South America Mexico Chihuahua 28? 39' N 106? 05' W 3.41 4.34 5.63 6.43 6.88 6.53 5.69 5.3 5.14 4.65 3.89 3.26 5.1
South America Mexico Cancun 21? 10' N 86? 50' W 4.16 5.14 6.04 6.86 6.79 6.47 6.63 6.65 5.86 5.19 4.51 3.9 5.68
South America Mexico Acapulco 16? 50' N 99? 54' W 5.46 6.3 7.17 7.41 7.06 6.16 6.29 6.2 5.45 5.94 5.56 5.19 6.18
South America Honduras Tegucigalpa 14? 05' N 87? 14' W 4.26 5.08 5.84 5.99 5.54 5.35 5.34 5.47 5.04 4.43 4.15 3.91 5.03
South America Guatemala Guatemala City 14? 37' N 90? 31' W 4.93 5.48 5.9 5.81 5.35 4.91 5.27 5.12 4.59 4.68 4.65 4.62 5.11
South America El Salvador San Salvador 13? 40' N 89? 10' W 5.58 6.23 6.68 6.52 5.95 5.74 6.22 6.18 5.49 5.61 5.42 5.3 5.91
South America Costa Rica San Jose 09? 59' N 84? 04' W 6.09 6.74 7.23 6.64 5.26 5 4.94 4.84 4.76 4.63 4.63 5.3 5.51
South America Belize Belize City 17? 30' N 88? 11' W 3.73 4.59 5.45 5.97 5.75 5.19 5.03 5.16 4.82 4.5 3.99 3.54 4.81
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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 5.4
USA 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
USA 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
USA 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
USA 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 4.8 3.93 2.96 2.25 4.34
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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
USA 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

The above insolation levels is data collected by NASA. If your regional insolation is not listed above, please visit the NASA website as shown below.

You need to know your latitude and longitude of your area. Free registration at the site is required for access.

Nasa Surface meteorology and Solar Energy Data Set


 

 

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