Probabilities of Last Spring Frost/Freeze across Western South Dakota

Spring is approaching...and eventually so are the end of freezing temperatures. A question we are often asked this time of year is, "By what date does my town typically get its last frost or freeze?" The charts and maps below will help answer that question for several locations across western South Dakota.

The charts below shows what chance the last frost (36º F) or freeze (32º F or below) will occur by a specific date. For example, in 90% of past years, the temperature at Rapid City last reached 32º F by May 24th. In half of the past years, Rapid City last reached 28ºF by April 28th.

The regional maps farther down show the average date of the first freeze (32º F) and hard freeze (28º F).

 

A special thanks to South Dakota State Climatologist, Dennis Todey for the data in the charts. More percentiles and locations can be found at South Dakota State University's Climate Page.

Rapid City 36º F
32º F
28º F
24º F
90% June 12
May 24
May 14
May 2
50% May 21
May 9
April 28
April 17
10% May 8
April 20
April 13

April 5

 

Lead 36º F
32º F
28º F
24º F
90% June 22
June 13
May 23
May 15
50% June 4
May 23
May 9
April 29
10% May 19
May 9 April 23

April 14

   

Custer 36º F
32º F
28º F
24º F
90% June 29
June 26
June 13
May 29
50% June 18
June 4
May 22
May 9
10% May 26
May 16
May 4

April 21

 

Faith 36º F
32º F
28º F
24º F
90% June 6
May 27
May 11
May 1
50% May 18
May 9
April 28
April 16
10% May 5
April 24
April 11

April 3

  

Camp Crook
36º F
32º F
28º F
24º F
90% June 17
June 8
May 26
May 16
50% June 4 May 22
May 11
April 29
10% May 18
May 9
April 29

April 15

  

Oelrichs 36º F
32º F
28º F
24º F
90% June 10
June 3
May 19
May 12
50% May 25
May 15
May 3
April 26
10% May 15
May 4
April 18

April 5

  

Winner 36º F
32º F
28º F
24º F
90% May 30
May 23
May 13
May 3
50% May 16
May 7
April 22
April 15
10% May 2
April 21
April 9

March 30

 

 Regional Maps: Median Date for last freeze (32º F) and hard freeze (28º F).

 A special thanks to the Midwestern Regional Climate Center for these maps.

 

 


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