Maps of when the first frost and freezing temperatures usually occur in Autumn.
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Maps of when the first frost and freezing temperatures usually occur in Autumn.

Clear skies and light winds allow for ideal radiational cooling at night. Frost becomes possible when the observed temperatures (taken at 2m (6ft) off the ground) drop into the Mid 30s (36°F).

A thresholds map of the average date of the end of the growing season is shown below. This map serves as a basis for issuing frost/freeze products and can also be accessed via our Thresholds Page on our website (see left column). In addition, high resolution images below the threshold map depict seasonal climatology of average first frost and freeze dates.

Map of the average date of the end of the growing season used by the National Weather Service in State College as a basis for Frost/Freeze products. NOTE: Landscape position (valley, ridge top, hillside)  may cause local dates to vary a few days (early/late) from those indicated. This is evident in the high resolution maps below.
Map of the average date of the end of the growing season used by the National Weather Service in State College as a basis for Frost/Freeze products. NOTE: Landscape position (valley, ridge top, hillside) may cause local dates to vary a few days (early/late) from those indicated. This is evident in the high resolution maps below.

High resolution map of the Average first frost
High resolution map of the Average first frost

High resolution map of the Average first freeze
High resolution map of the Average first freeze


 
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Page Last Modified: 20 September 2007 21:32:39 UTC
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