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Frost

The occurrence of sub-freezing temperatures inhibits mosquito development and activity. A freeze (28°F) represents relatively severe freezing conditions, whereas a frost (32°F) is generally less detrimental to cold-sensitive biological activity.

The climatological dates of the last spring and first fall frost and freeze are also shown. These are useful for long-range scheduling of mosquito control operations. Shown are the average dates of these occurrences as well as two extremes. In the spring the 90% and 10% chance dates indicate the probability of experiencing a frost or freeze after a given date. In fall, the dates represent the probability of experiencing a frost or freeze before a given date.


 

Climatological Date
of Last Spring 28°F


Climatological Date
of Last Spring 32°F

Climatological Date
of First Fall 28°F


Climatological Date
of First Fall 32°F