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| Unusually Late End to the Growing Season |
The mild weather of the Autumn of 2010 has resulted in a late first-freeze. As of October 20th, more than half of Central PA has not yet experienced the first freeze of the autumn.
Normally, our office will issue frost advisories and freeze warnings for each forecast zone (generally an entire county) until the first autumn freeze actually occurs.
However, due to the mild autumn temperatures, we have the latitude in our operating guidance (NWS Directives) to end the issuance of Frost Advisories and Freeze Warnings on set dates, barring an earlier freeze. The dates we have chosen for this season are about 10-14 days after the average date of the first autumn freeze.
See the first map below for these 2010 dates. The red counties have already gone below freezing. The other dates listed have been chosen.
The second map below is the average date of the first autumn freeze. |
| Late Freeze Dates for Central PA in 2010 |
| Climatological Average First Freeze Dates in Central PA |
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