Last Average Frost Date - Knowledgebase Question

Allentown, PA
Question by coshin
May 21, 1998
How is last frost date computed, in other words, how often will there be a frost after that date?


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Answer from NGA
May 21, 1998

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Probably about half the time, since it is computed as an average. The frost date is a rough guide for your general area, and as such it is only a reference. Some years provide a late spring with lots of cold snaps and others seem to jump straight into summer. In addition, you might find that the last frost at your house is usually a week earlier or later than the average. This would be a reflection of your local microclimate and is a better indicator than the regional average could ever be!

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