Record Cool Summer 2009

 

The summer (June-August) of 2009 was one of the coolest summers on record across central and northeast South Dakota as well as west central Minnesota. Prevailing northwest winds throughout the summer brought frequent shots of Canadian air into the region.  The average summer temperatures for locations across the region were from 3 to 5 degrees below normal.  All locations were among the top five coolest summers on record with none of the locations reaching 100 degrees from June through August. In fact, Pierre also did not reach 100 degrees in the summer of 2008. Since records began, Pierre has never had two consecutive summers that had not reached 100 degrees.

 As for precipitation, most locations were from near to much above normal for the summer of 2009 with Wheaton in west central Minnesota well below normal. Kennebec finished the summer of 2009 nearly 3 and a half inches above normal.

Listed below are the summer 2009 temperature rankings for several locations across the area.  The summer period average temperature was for the months of June, July, and August.

Kennebec:  The 68.6 temperature ranks as the 2nd coldest on record.

Mobridge:  The 65.6 temperature ranks as the 3rd coldest on record.

Timber Lake:  The 66.0 temperature ranks as the 3rd coldest on record.

Pierre:  The 68.4 temperature ranks as the 4th coldest on record.

Wheaton, MN:  The 65.6 ties for the 4th coldest summer on record.  This tied with 2004.

Sisseton:  The 65.5 ranks as the 4th coldest on record.  2004 is the third coldest.

Watertown:  The 64.6 ties for the 5th coldest on record.

Aberdeen:  The 65.4 ranks as the 5th coldest on record.

 

 

Temperature Data

Aberdeen

Sisseton

Wheaton

Watertown

Warmest Temperature/Date

92  6/26; 8/12

93  6/26

94  8/13

90 6/26; 8/12

Coldest Temperature/Date

38  6/4

37  6/3

41  6/3; 6/6

39  6/3

Seasonal Average High/Departure from Normal

77.4 / -4.9

76.4 / -5.0

76 / -6.9

75.1 / -4.8

Seasonal Average Low/Departure from Normal

53.5 / -3.8

54.6 / -3.3

55.1 / -3.8

54.1 / -1.8

Seasonal Average/Departure from Normal

65.4 / -4.4

65.5 / -4.2

65.6 / -5.3

64.6 / -3.3

Precipitation Data

       

Seasonal Precipitation / Departure from Normal

9.16 / +0.33

7.91 / -1.11

6.24 / -3.17

9.66 / -0.11

Most Precipitation in One Day/Date

0.97  6/16

2.97  8/7

0.93  8/16

1.17  8/18

         

Temperature Data

Pierre

Kennebec

Mobridge

Timber Lake

Warmest Temperature/Date

97 7/26; 8/2;

8/12

97  8/2

93  7/23

98  8/12

Coldest Temperature/Date

42  6/6;  6/11

41  6/5

38  6/4; 6/11

38  6/4; 6/6

Seasonal Average High/Departure from Normal

81.2 / -5.0

81.9 / -6.2

77.9 / -5.0

78.9 / -3.6

Seasonal Average Low/Departure from Normal

55.6 / -3.7

55.2 / -3.9

53.3 / -5.2

53.1 / -3.9

Seasonal Average/Departure from Normal

68.4 / -4.4

68.6 / -5.0

65.6 / -5.1

66.0 / -3.8

Precipitation Data

       

Seasonal Precipitation / Departure from Normal

8.08 / -0.02

11.15 / +3.37

7.73 / +0.65

9.10 / +1.58

Most Precipitation in One Day/Date

1.64  8/15

1.78  6/27

1.11  7/14

1.65  7/13

 



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