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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 station, you will see a temperature along with a pile of percentage columns. Here's how it works: The percent column tells you the probability that you will experience that row's temperature on or before that date.

So, for example, in the Spring 32° row, if you have "Apr 15" under the 50% column, that means that you have a 50% chance of seeing frost on or before April 15th.

Another example. Say in the Fall 24° row, under 90%, you have Dec 1, then that means that you have a 90% chance of seeing 24 degrees on or before December 1st.

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


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