| The average amount of Sunlight falling on the ground depends on the average atmosphereic condition and the latitude of a specific location. This can be seen on the following map of the US showing the average solar radiation falling on a horizontal surface in the month of June. |
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| The red, orange, and yellow areas of the map are areas of higher solar intensity, while the green and blue areas are of lower intensity. Units are in kWh/mē.
Source: University of Dayton |