Cooler Than Normal May

After a couple of months with above normal temperatures across the region, May 2010 across central and northeast South Dakota along with west central Minnesota had below normal temperatures.  The precipitation for May was generally above normal across the region.  Average temperatures for May ranged from 4 tenths to nearly 4 degrees below normal.   After a very warm April, widespread freezing temperatures occurred early in the month with lows in the mid 20s to the lower 30s on May 8th and 9th.  The high temperatures for May were in the upper 80s to the lower 90s which occurred at the end of the month.

The rainfall amounts for May across the area were generally from a quarter of an inch to nearly 2 inches above normal.  Both Sisseton and Wheaton had below normal rainfall for the month.  In the Aberdeen area, where ongoing flooding continues to be an issue, May’s rainfall was 4.46 inches or 1.77 inches above normal.  On the cold side, Timber Lake in north central South Dakota had 1.2 inches of snowfall on May 7th.

The big story for the month of May was the damaging tornados in north central into northeast South Dakota touching down from Akaska to Bowdle to Hecla on May 22nd.  Eight tornados touched down with the largest tornado being an EF4 tornado (winds 166-200 mph) which just missed the town of Bowdle. 

MAY 2010

       

Temperature Data

Aberdeen

Sisseton

Wheaton

Watertown

Warmest Temperature / Date

90 / 29th

93 / 29th

92 / 25th, 30th

87 / 24th, 29th

Coldest Temperature / Date

32 / 8-9th

31 / 9th

32 / 9th

29 / 9th

Average High / Departure from Normal

66.4 / -3.8

67.4 / -2.8

67.1 / -5.2

65.4 / -2.5

Average Low / Departure from Normal

46.0 / +0.4

45.9 / -0.2

46.9 / -0.2

45.4 / +1.8

Monthly Average / Departure from Normal

56.2 / -1.7

56.7 / -1.5

57.0 / -2.7

55.4 / -0.4

Precipitation Data

       

Monthly Precipitation / Departure from Normal

4.46 / +1.77

2.12 / -0.64

1.81 / -0.73

3.02 / +0.41

Most Precipitation in 24 hours / Date

1.23 / 22nd

0.56 / 22nd

0.44 / 11th

0.99 / 22nd

         

Temperature Data

Pierre

Kennebec

Mobridge

Timber Lake

Warmest Temperature / Date

90 / 28th

94 / 22nd

90 / 28th

92 / 28th

Coldest Temperature / Date

27/ 8th

24 / 8th

29 / 8th

26 / 8th

Average High / Departure from Normal

65.9 / -5.5

69.6 / -4.4

64.6 / -5.0

65.2 / -4.4

Average Low / Departure from Normal

44.2 / -2.1

44.9 / -1.2

44.4 / -1.2

42.5 / -2.0

Monthly Average / Departure from Normal

55.0 / -3.9

57.3 / -2.8

54.5 / -3.1

53.8 / -3.2

Precipitation Data

       

Monthly Precipitation / Departure from Normal

3.72 / +0.58

3.23 / +0.21

3.45 / +0.82

4.77 / +1.87

Most Precipitation in 24 hours / Date

0.92 / 10th

0.88 / 30th

   1.34/ 21st-22nd

1.74 / 22nd



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