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First and last freeze/frost dates for Northampton, MA ,United States

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from September 28 through May 10.

Almost certainly, however, you will receive frost from October 9 through April 26.

You are almost guaranteed that you will not get frost from May 24 through September 17.

Your frost-free growing season is around 141 days.

Detailed station data* follows:

Amherst, MA (Hampshire county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 24 May 19 May 16 May 13 May 10 May 7 May 4 May 1 Apr 26
Spring 28° May 9 May 6 May 3 May 1 Apr 28 Apr 26 Apr 24 Apr 21 Apr 17
Spring 24° May 4 Apr 28 Apr 24 Apr 20 Apr 17 Apr 13 Apr 10 Apr 5 Mar 31
Fall 32° Sep 17 Sep 21 Sep 23 Sep 26 Sep 28 Sep 30 Oct 2 Oct 5 Oct 9
Fall 28° Sep 27 Oct 3 Oct 7 Oct 10 Oct 13 Oct 16 Oct 20 Oct 24 Oct 29
Fall 24° Oct 7 Oct 13 Oct 17 Oct 21 Oct 24 Oct 27 Oct 31 Nov 3 Nov 8

Tully Dam, MA (Worcester county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 20 May 17 May 14 May 12 May 9 May 7 May 5 May 2 Apr 28
Spring 28° May 7 May 3 May 1 Apr 28 Apr 26 Apr 24 Apr 21 Apr 18 Apr 15
Spring 24° Apr 23 Apr 19 Apr 17 Apr 14 Apr 12 Apr 10 Apr 7 Apr 4 Mar 31
Fall 32° Sep 19 Sep 22 Sep 24 Sep 26 Sep 28 Sep 30 Oct 2 Oct 4 Oct 7
Fall 28° Oct 1 Oct 6 Oct 9 Oct 11 Oct 13 Oct 16 Oct 18 Oct 21 Oct 25
Fall 24° Oct 12 Oct 17 Oct 22 Oct 25 Oct 29 Oct 31 Nov 4 Nov 8 Nov 14

Keene, NH (Cheshire county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 27 May 22 May 19 May 16 May 13 May 10 May 7 May 4 Apr 29
Spring 28° May 14 May 10 May 7 May 4 May 2 Apr 29 Apr 27 Apr 24 Apr 19
Spring 24° Apr 28 Apr 24 Apr 21 Apr 18 Apr 16 Apr 13 Apr 11 Apr 8 Apr 4
Fall 32° Sep 13 Sep 17 Sep 21 Sep 23 Sep 26 Sep 29 Oct 2 Oct 5 Oct 9
Fall 28° Sep 25 Sep 29 Oct 2 Oct 4 Oct 7 Oct 9 Oct 12 Oct 15 Oct 19
Fall 24° Oct 3 Oct 8 Oct 12 Oct 16 Oct 19 Oct 22 Oct 25 Oct 29 Nov 3

* This station data is available courtesy the National Climatic Data Center.

For each weather station, you will see a temperature along with tables of data organized into percentage columns. The percentage column tells you the probability that you will experience that row's temperature on or near that date. Here are two examples to help you determine your probable last frost and first freeze dates.

Example 1 (Last Frost). In the Spring 32° row, if you have "Apr 15" under the 50% column, that means you have a 50% chance of seeing frost on or before April 15th.

Example 2 (First Freeze). In the Fall 24° row, if you have "Dec 1" under the 90% column, that means you have a 90% chance of seeing 24 degrees on or after December 1st.

Empty cells indicate you have a less than 10% chance of ever seeing that temperature.


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