Very Wet and Cool September

 September 2010 across central and northeast South Dakota as well as west central Minnesota was a very wet and cool month.  Average temperatures across the area ranged from a half degree to nearly 5 degrees below normal.  The average daily highs were especially cool ranging from 2 to over 7 degrees below normal.  Much of the coolness was related to many weather systems coming across the region bringing cloud cover along with abundant rainfall.  September rainfall amounts ranged from 2 to over 7 inches across the area which is from a half inch to over 5 inches above normal.  As a result, most of the locations had one of their top ten wettest Septembers on record. Watertown had its second wettest September on record while Wheaton had its third wettest.   Sisseton and Timber Lake both had their fifth wettest September on record while Pierre and Aberdeen finished the month with their tenth wettest September on record. 

SEPTEMBER 2010

       

Temperature Data

Aberdeen

Sisseton

Wheaton

Watertown

Warmest Temperature / Date

80 / 12th

81 / 20th

80 / 21st

82 / 20th

Coldest Temperature / Date

37 / 16th

35 / 22nd

38 / 18th

37 / 18th

Average High / Departure from Normal

69.5 / -3.5

68.1 / -3.8

66.7 / -7.5

67.5 / -2.8

Average Low / Departure from Normal

46.2 / -0.3

46.3 / -1.9

47.2 / -1.8

47.5 / +1.8

Monthly Average / Departure from Normal

57.9 / -1.9

57.2 / -2.9

57.0 / -4.7

57.5 / -0.5

Precipitation Data

       

Monthly Precipitation / Departure from Normal

4.08 / +2.27

5.61 / +3.66

7.42 / +5.32

6.08 / +4.05

Most Precipitation in 24 hours / Date

1.01 / 10th

1.29 / 6-7th

1.42 / 7th

2.82 / 14-15th

         

Temperature Data

Pierre

Kennebec

Mobridge

Timber Lake

Warmest Temperature / Date

87 / 1st

91 / 20th

81 / 28th

84 / 28th

Coldest Temperature / Date

40 / 18th

38 / 24th

36 / 30th  

34 / 18th

Average High / Departure from Normal

73.2 / -4.2

76.3 / -3.7

70.6 / -3.2

71.3 / -2.4

Average Low / Departure from Normal

47.8 / -1.2

47.3 / -1.6

46.3 / -2.4

46.2 / -0.7

Monthly Average / Departure from Normal

60.5 / -2.7

61.8 / -2.7

58.4 / -2.9

58.8 / -1.6

Precipitation Data

       

Monthly Precipitation / Departure from Normal

2.89 / +1.34

2.82 / +1.39

1.84 / +0.50

3.29 / +2.03

Most Precipitation in 24 hours / Date

1.35 / 14-15th

1.06 / 15th

1.22 / 6th

1.26 / 6th



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