National Weather Service United States Department of Commerce

After a very cold November, December 2014 was much warmer than normal across all of central and northeast South Dakota as well as west central Minnesota.  Average monthly temperatures were anywhere from 2 to 7 degrees above normal.  The low temperature departures were impressive across the region being up to 8 to 9 degrees above normal across the east.  The big reason for the little fluctuation from daytime to nighttime temperatures was not only because of the milder and moist air mass over the region, but also because of the large number of days with fog and low clouds.  The clouds and fog kept the temperatures from falling off much at night with little rise in temperatures during the day.  In fact, all locations experienced many cloudy and foggy days throughout December with several of those days experiencing dense fog.  Mobridge and Pierre experienced 16 days with fog while Aberdeen experienced 19 days with fog. Watertown experienced the most days with fog with a total of 23 days.  In fact, Watertown showed some kind of fog from December 7th through the 28th. 

Precipitation for the month was varied across the region from a quarter of an inch below normal to almost a half inch above normal.  Snowfall amounts also varied from 7 inches below normal at Wheaton, Minnesota to 9 inches above normal at Kennebec.  Wheaton only received a little over an inch of snow for the month while Kennebec received almost 16 inches.  With the warmer temperatures, there were also a few rare days in December where the precipitation was all rain.

DECEMBER 2014

       

Temperature Data

Aberdeen

Sisseton

Wheaton

Watertown

Warmest Temperature / Date

51 / 13th

53 / 13th

46 /14th, 15th

49 / 13th, 14th

Coldest Temperature / Date

-16 / 1st

-12 / 1st

-11 / 2nd

-13 / 1st

Average High / Departure from Normal

29.7 / +4.2

28.6 / +2.5

26.9 / +4.0

28.5 / +3.7

Average Low / Departure from Normal

15.0 / +9.1

15.2 /  +7.3

13.9 / +7.9

15.1 / +7.9

Monthly Average / Departure from Normal

22.4 / +6.7

21.9 / +4.9

20.4 / +6.0

21.8 / +5.8

Precipitation Data

       

Monthly Precipitation / Departure from Normal

0.25 / -0.27

0.60 / +0.21

0.46 / -0.26

0.64 / +0.11

Monthly Snowfall / Departure from Normal

0.7 / -6.2

4.7 / -2.9

1.4 / -6.8

3.8 / -3.3

Most Precipitation in 24 hours / Date

0.25 / 22nd-23rd

0.31 / 22nd-23rd

0.18 / 23rd

0.29 / 25th

Most Snow in 24 hours / Date

0.5 / 23rd

3.0 / 15th

0.9 / 16th

2.6 / 25th

         

Temperature Data

Pierre

Kennebec

Mobridge

Timber Lake

Warmest Temperature / Date

60 / 12th

64 / 12th

55 / 7th

54 / 12th

Coldest Temperature / Date

-12 / 31st

-18 / 30th

-11 / 30th

-15 / 30th

Average High / Departure from Normal

33.3 / +2.0

36.1 / +3.4

32.3 / +3.6

32.5 / +3.0

Average Low / Departure from Normal

14.1 / +2.0

14.3 / +3.0

14.4 / +6.7

14.4 / +4.5

Monthly Average / Departure from Normal

23.7 / +2.0

25.2 / +3.2

23.3 / +5.1

23.5 / +3.8

Precipitation Data

       

Monthly Precipitation / Departure from Normal

0.82 / +0.27

0.84 /  +0.46

0.42 / -0.02

0.46 / -0.02

Monthly Snowfall / Departure from Normal

10.2 / +5.3

15.5 / +8.9

2.8 / -2.9

5.6 / -1.9

Most Precipitation in 24 hours / Date

0.35 / 15th

0.37 / 15th

.41/22nd23rd

0.38 / 23rd

Most Snow in 24 hours / Date

4.0 / 15th

5.0 / 15th, 23rd

2.5 / 22nd

4.0 / 23rd