Statistical Dates of the First Fall Frost/Freeze

Tracking Freezing Temperatures Across the Northern Plains:

With the approach of the autumnal equinox, freezing temperatures will begin to show up across the northern plains in the very near future.  For detailed information and graphics on freeze conditions, please consult the Midwest Regional Climate Center (MRCC) by clicking HERE.

 The NWS in Aberdeen will issue several products to alert users for the potential for frost or freeze conditions. These products will be issued until the following:

1) a hard freeze occurs over a majority of the area
2) until October 15th (statistical end of the growing season)

Descriptions of the products are provided below:

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.

 

 

The table and chart below summarize the date when temperatures of a given threshold are expected to be reached. The graphic depicts the median date of the first 32F temperature across the Midwest, with the chart providing a more in depth comparison across the Aberdeen CWA. For example, in Aberdeen, the average (or mean) date when temperatures are first expected to fall at or below 32F occurs on September 22nd. Similarly, 90 percent of time, temperatures in Aberdeen will have fallen at or below 28F by October 15th.

 

 

 

ABERDEEN

36F

32F

28F

24F

90th

25-Sep

7-Oct

15-Oct

30-Oct

75th

21-Sep

29-Sep

9-Oct

20-Oct

50th

15-Sep

22-Sep

30-Sep

11-Oct

Mean

13-Sep

22-Sep

1-Oct

11-Oct

PIERRE

36F

32F

28F

24F

90th

2-Oct

18-Oct

28-Oct

7-Nov

75th

29-Sep

10-Oct

22-Oct

31-Oct

50th

21-Sep

4-Oct

12-Oct

23-Oct

Mean

22-Sep

4-Oct

13-Oct

22-Oct

WATERTOWN

36F

32F

28F

24F

90th

27-Sep

7-Oct

14-Oct

29-Oct

75th

21-Sep

1-Oct

10-Oct

21-Oct

50th

16-Sep

24-Sep

3-Oct

10-Oct

Mean

13-Sep

23-Sep

3-Oct

11-Oct

MOBRIDGE

36F

32F

28F

24F

90th

4-Oct

13-Oct

26-Oct

5-Nov

75th

27-Sep

7-Oct

16-Oct

30-Oct

50th

18-Sep

28-Sep

6-Oct

22-Oct

Mean

19-Sep

29-Sep

6-Oct

19-Oct

Mike Fowle - Science and Operations Officer

 




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