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Where do you find the amount of days of sun per year you might expect in a certain area? For example, Phil., PA?

Wataya | Posted in Green Building Techniques on

Is this information available on the net?

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  1. GBA Editor
  2. Riversong | | #2

    For what purpose? The number of sun days per year is an almost meaningless number. What's more important for most applications is the intensity of solar radiation, the monthly solar availability, and the monthly sun angles.

    There are many links for a variety of solar data at:

  3. user-282515 | | #3


    You can also visit for complete climatological data for your area.

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