Spring Frost and Freeze Info - Including Statistical Dates of Last Occurrence

The record to near record cold temperatures in March and April of 2013 has led to a slower than normal start to the growing season over much of north-central and northeastern South Dakota and west-central Minnesota.  As the growing season progresses, the NWS in Aberdeen can issue several products to alert users for the potential for frost or freeze conditions (see below). These products will begin to be issued on and after Wednesday, May 15th, 2013.

NOTE:  Freezing conditions are possible this weekend - especially on Saturday night and Sunday morning.  However, after coordination with agricultural community, it was determined that growing season has not progressed to a point where a freeze would significantly affect most plants. 


Freeze Watch:   Issued when conditions are favorable for temperatures to fall below 32 degrees Fahrenheit during the next 12 to 48 hours resulting in the possibility for significant damage to unprotected vegetation. 

Freeze Warning: Issued when confidence is high that temperatures will fall below 32 degrees Fahrenheit within the next 24 hours resulting in significant damage to unprotected vegetation. 
Frost Advisory: Issued when conditions are favorable for temperatures to drop between 33 and 36 degrees Fahrenheit resulting in the possibility of widespread frost near the surface. Unprotected vegetation may be damaged.

 Statistical Dates of the Last Spring Frost/Freeze

To assist the agricultural community, below is a table that summarizes the last calendar day when temperatures of a given threshold are expected to be met. The data is courtesy of the South Dakota Climatologist's Office. 

Below are a few examples on how to read the table using Aberdeen:

  • Mean (or average) date when temperatures are last expected to fall to 32F occurs on May 13th  
  • 75% probability that the last 32F degree temperature will occur on or before May 19th  
  • 90% probability that the last 32F degree temperature will occur on or before May 27th

 

ABERDEEN  

36F

32F

28F

24F

 

90th

7-Jun

27-May

18-May

9-May

 

75th

29-May

19-May

12-May

1-May

 

50th

24-May

13-May

3-May

19-Apr

 

Mean

23-May

13-May

3-May

21-Apr

 

 

 

 

 

 

PIERRE

 

36F

32F

28F

24F

 

90th

27-May

16-May

10-May

4-May

 

75th

20-May

13-May

2-May

24-Apr

 

50th

13-May

7-May

23-Apr

14-Apr

 

Mean

13-May

5-May

25-Apr

15-Apr

 

 

 

 

 

 

WATERTOWN 

 

36F

32F

28F

24F

 

90th

11-Jun

1-Jun

20-May

10-May

 

75th

4-Jun

24-May

12-May

2-May

 

50th

25-May

16-May

4-May

21-Apr

 

Mean

26-May

16-May

4-May

23-Apr

 

 

 

 

 

 

MOBRIDGE

 

36F

32F

28F

24F

 

90th

1-Jun

22-May

15-May

29-Apr

 

75th

24-May

14-May

7-May

28-Apr

 

50th

17-May

9-May

28-Apr

15-Apr

 

Mean

18-May

8-May

29-Apr

18-Apr



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