National Weather Service United States Department of Commerce

May was a very wet month across the region along with cooler than normal temperatures.  Rainfall amounts were generally from 3 to over 9 inches or from 2 to over 6 inches above normal.  Kennebec was the only location with just below normal rainfall.  Pierre, Mobridge, Wheaton, and Aberdeen all had one of their top ten wettest Mays on record. In fact, the 9.32 inches at Mobridge was not only their wettest May on record, but also their wettest month of all-time.  The previous wettest month on record for Mobridge was June 1915 when they received 8.85 inches of precipitation. The monthly rankings for the top ten are located in parentheses by the monthly precipitation amounts.  The most interesting fact for the region was that drought covered much of the area at the beginning of the month with most of the area in moderate to severe drought.  It is quite amazing how a drought can be eliminated or nearly eliminated over a short period of time. The unusual weather in May was the heavy snow that occurred across north central South Dakota with 6 to 12 inches of snow from May 9th into the 11th.

After several above normal temperature months, average temperatures for May were from 1 to 4 degrees below normal across the region.  Later than average freezing temperatures also occurred across central and north central South Dakota when temperatures fell into the upper 20s at several locations.

MAY 2015

       

Temperature Data

Aberdeen

Sisseton

Wheaton

Watertown

Warmest Temperature / Date

88 / 2nd

87 / 2nd

87 / 3rd

84 / 2nd

Coldest Temperature / Date

28 / 4th

32 / 19th, 20th

31 /9th, 10th

31 / 9th

Average High / Departure from Normal

67.2 / -1.5

 66.3 / -3.1

65.3 / -3.2

65.1 / -2.5

Average Low / Departure from Normal

43.4 / -0.7

43.4 / -1.7

43.9 / -1.8

44.3 / -0.3

Monthly Average / Departure from Normal

55.3 / -1.1

54.8 / -2.5

54.6 / -2.5

54.7 / -1.4

Precipitation Data

       

Monthly Precipitation / Departure from Normal

6.39 (7)/ +3.28

5.19/ +2.40

6.04 (5)/+3.36

4.61 / +1.97

Most Precipitation in 24 hours / Date

2.44 / 10 -11th

1.79 / 10-11th

2.22 / 11th

1.39 / 9-10th

Monthly Snowfall / Departure from Normal

Trace / 0.0

Trace / 0.0

0.0 / 0.0

Trace / 0.0

         

Temperature Data

Pierre

Kennebec

Mobridge

Timber Lake

Warmest Temperature / Date

89 / 2nd

87 / 2nd

90 / 2nd

86 / 2nd

Coldest Temperature / Date

29 / 19th

28 / 19th

31 / 19th

29 / 19th

Average High / Departure from Normal

66.8 / -3.4

70.1 / -2.8

67.4 / -1.0

66.6 / -3.1

Average Low / Departure from Normal

43.7 / -2.0

43.7 / -2.2

43.3 / -0.6

41.6 / -2.4

Monthly Average / Departure from Normal

55.2 / -2.7

56.9 / -3.7

55.3 / -0.9

54.1 / -2.8

Precipitation Data

       

Monthly Precipitation / Departure from Normal

6.18 (3) / +3.03

2.94 / -0.22

9.32 (1)/ +6.50

5.18 /+2.34

Most Precipitation in 24 hours / Date

2.37 / 28-29th

0.95 / 10th

3.21 / 17th

0.86 / 6th

Monthly Snowfall / Departure from Normal

Trace / 0.0

0.0 / 0.0

Trace / -0.3

8.8 / +8.6

 

Current Climate Summary Map

The map above is the precipitation amounts for the month of May.  This map is courtesy of the High Plains Regional Climate Center.

Here are some additional precipitation amounts with monthly rank in parentheses.

Artichoke Lake, MN  -  7.22 (2nd)

Faulkton  -  6.09 (7th)

Gettysburg  -  6.37 (1st)

Ipswich  -  7.93 (3rd)

McIntosh  -  4.29 (14th)

Murdo  -  6.40 (4th)

Pollock  -  5.20 (5th)

Roscoe  -  7.81 (1st)

Selby  -  5.59 (4th)

Victory -  7.23 (4th)

Webster  -  5.46 (8th)

 

This was the Drought Conditions on May 5th

https://droughtmonitor.unl.edu/data/jpg/20150505/20150505_sd_trd.jpg

This was the Drought Conditions on May 26th

https://droughtmonitor.unl.edu/data/jpg/20150526/20150526_sd_trd.jpg