August Climate Information

 August 2010 heated up across central and northeast South Dakota and also dried out from the James River Valley west to areas either side of the Missouri River.  Average temperatures for August ranged from near normal to much above normal across the area.  Wheaton’s average August temperature was three tenths of a degree below normal while Watertown was almost five degrees above normal.  For the past few summers, 100 degree temperatures were unheard of across our area.  For this summer, 100 degree readings have occurred multiple times across central and north central South Dakota.  Mobridge, Pierre, Kennebec, and Timber Lake were at 100 degrees or above for a combined ten times in August.  The hottest day was August 27th where Mobridge reached 106 degrees and Pierre reached 108 degrees.  The drier month along with the increasing drought area across north central South Dakota contributed to these warmer temperatures.  The air temperature warms up much more over a dry ground then over a wet ground.

The rainfall for August was below normal across central and north central South Dakota from the James River Valley and west to the Missouri River. Rainfall amounts were around an inch to inch and a half below normal for the month.  This contributed to the expanding drought area across north central South Dakota in August.  With all of the dryness and warmer days along with periods of stronger winds and lower humidity, the fire danger has also become a bigger concern across the central and western parts of the region.   East of James River Valley into west central Minnesota, August rainfall ranged from near to much above normal as frequent thunderstorms rolled across this part of the region. Wheaton had almost 4 inches of rainfall in August.   

AUGUST 2010

       

Temperature Data

Aberdeen

Sisseton

Wheaton

Watertown

Warmest Temperature / Date

96 / 22nd

93 / 22nd

92 / 10th

94 / 8th

Coldest Temperature / Date

47 / 25th

47 / 17th

50 / 25-26th

48 / 25th

Average High / Departure from Normal

85.7 / +2.2

83.1 / +1.0

82.3 / -1.2

83.5 / +3.5

Average Low / Departure from Normal

61.1 / +3.7

61.3 / +3.1

60.9 / +1.8

62.3 / +6.3

Monthly Average / Departure from Normal

73.4 / +2.9

72.2 / +2.0

71.6 / -0.3

72.9 / +4.9

Precipitation Data

       

Monthly Precipitation / Departure from Normal

1.01 / -1.41

2.67 / +0.08

3.95 / +1.42

3.52 / +0.67

Most Precipitation in 24 hours / Date

0.64 / 1st

1.05 / 7th

1.40 / 31st

1.57 / 30th

         

Temperature Data

Pierre

Kennebec

Mobridge

Timber Lake

Warmest Temperature / Date

108 / 27th

101 / 22nd,  27th

106 / 27th

104 / 22nd

Coldest Temperature / Date

48 / 25th

43 / 25th

44 / 25th

46 / 25th

Average High / Departure from Normal

90.6 / +2.6

91.7 / +2.1

87.7 / +3.2

88.0 / +3.9

Average Low / Departure from Normal

62.4 / +2.3

61.8 / +1.9

59.1 / -0.2

59.6 / +1.9

Monthly Average / Departure from Normal

76.5 / +2.4

76.7 / +1.9

73.4 / +1.5

73.8 / +2.2

Precipitation Data

       

Monthly Precipitation / Departure from Normal

0.83 / -1.03

1.15 / -0.87

0.65 / -1.22

1.04 / -0.85

Most Precipitation in 24 hours / Date

0.50 / 3rd

0.50 / 10th

0.36 / 12-13th

0.36 / 13th

 



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