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Solar Insolation Levels In North America - China Solar Panel

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Solar Insolation Levels In North America

Solar Insolation Levels In North America
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)

State  City  Latitude  Longitude  Year Avg
AL Birmingham 33′ 34″ N 86′ 45″ W 4.34
AK Anchorage 61′ 10″ N 150′ 1″ W 2.09
AR Little Rock 32′ 25″ N 94′ 44″ W 4.46
AZ Phoenix 33 ‘ 26″ N 112′ 1″ W 5.38
CA Los Angeles 34′ N 118′ W 5.4
CA San Francisco 38′ 31″ N 121′ 30″ W 4.89
CO Denver 39′ 45″ N 104′ 52″ W 4.55
CT Hartford 41′ 44″ N 72′ 39″ W 3.59
DE Dover 39′ 8″ N 75′ 28″ W 3.84
FL Miami 25′ 48″ N 80′ 16″ W 5.26
GA Atlanta 33′ 39″ N 84′ 26″ W 4.37
HI Honolulu 21′ 20″ N 157′ 55″ W 5.96
IA Dubuque 42′ 24″ N 90′ 42″ W 3.77
ID Boise 43′ 34″ N 116′ 13″ W 4.24
IN Indianapolis 39′ 44″ N 86′ 17″ W 3.87
IL Chicago 41′ 53″ N 87′ 38″ W 3.72
KS Kansas City 39′ 12″ N 94′ 36″ W 4.11
KY Louisville 38′ 11″ N 85′ 44″ W 3.9
LA New Orleans 29′ 37″ N 90′ 5″ W 4.76
MA Boston 42′ 22″ N 71′ 2″ W 3.58
MD Annapolis 38′ 35″ N 76′ 21″ W 3.98
ME Portland 45′ 36″ N 122′ 36″ W 3.82
MI Detroit 42′ 25″ N 83′ 1″ W 3.58
MO St.Louis 38′ 45″ N 90′ 23″ W 4.09
MN Minneapolis 44′ 53″ N 93′ 13″ W 3.68
MS Jackson 42′ 16″ N 84′ 28″ W 3.59
MT Billings 45′ 48″ N 108′ 32″ W 3.96
MT Great Falls 43′ 33″ N 96′ 42″ W 3.79
NC Charlotte 35′ 13″ N 80′ 56″ W 4.2
ND Fargo 46′ 54″ N 96′ 48″ W 3.68
NE Omaha 41′ 18″ N 95′ 54″ W 3.98
NH Manchester 42′ 56″ N 71′ 26″ W 3.58
NJ Trenton 40′ 13″ N 74′ 46″ W 3.63
NM Albuquerque 35′ 3″ N 106′ 37″ W 4.97
NV Las Vegas 36′ 18″ N 115′ 16″ W 5.3
NY New York 41′ N 74′ W 3.53
OH Columbus 39′ 16″ N 85′ 54″ W 3.83
OK Tulsa 36′ 12″ N 95′ 54″ W 4.36
OR Portland 45′ 32″ N 122′ 40″ W 3.82
PA Philadelphia 39′ 53″ N 75′ 15″ W 3.84
PA Pittsburgh 40′ 27″ N 79′ 57″ W 3.53
RI Providence 41′ 44″ N 71′ 26″ W 3.64
SC Columbia 38′ 58″ N 92′ 22″ W 4.15
SD Sioux Falls 45′ 27″ N 98′ 25″ W 3.87
TN Nashville 36′ 7″ N 86′ 41″ W 4.04
TX San Antonio 29′ 32″ N 98′ 28″ W 4.83
TX Houston 29′ 59″ N 95′ 22″ W 4.72
UT Salt Lake City 40′ 46″ N 111″ 52″ W 4.53
VA Washington 38′ 51″ N 77′ 2″ W 3.9
VT Montpelier 44′ 16″ N 72′ 35″ W 3.43
WA Seattle 47′ 32″ N 122′ 18″ W 3.53
WI Milwaukee 42′ 57″ N 87′ 54″ W 3.69
WV Charleston 38′ 22″ N 81′ 36″ W 3.73
WY Casper 42′ 55″ N 106′ 28″ W 4.25

Data provided by NASA

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