Will Pierre Finally Reach 100F This Week?? (updated 8/13)

Temperatures this summer have remained well below normal over much of the Northern Plains -- including portions of South Dakota and west-central Minnesota. This is not a new trend -- as temperatures have generally been below normal since the winter of 2007-2008 (see Table 1 below).  A quick look at the temperature trends this year indicate that the number of calendar days when the high temperatures have exceeded 90F, 95F or 100F at Pierre, Aberdeen, and Watertown are still well below climatological averages (see listings below) and very much mimic the trends from the cool summer of 2008.  Recall that last summer Pierre failed to reach 100F for only the second time since 1933.   

Temperatures are expected to remain hot through the end of the week as a large ridge of high pressure develops over the central U.S.  In fact, abundant sunshine and a persistent southerly wind flow will lead to one of the hottest stretches of temperatures so far this summer. 

The big question is whether or not Pierre will finally reach that magic 100F temperature mark??  Current forecasts indicate high temperatures will likely rise near 100F in Pierre both Thursday and Friday.  Since 1933, Pierre has never experienced back to back summers when temperatures have failed to reach 100F.  

Listed below are the dates when the temperatures last reached 100F at selected cities in the NWS Aberdeen Forecast area:

  • Aberdeen (102F):  July 7, 2007 
  • Pierre (101F): - September 4, 2007
  • Watertown (100F): July 7, 2007  
  • Mobridge (100F): - August 13, 2007
  • Wheaton (100F): - July 8, 2007  

 


 

TABLE 1:  MONTHLY TEMPERATURE DEPARTURES SINCE NOVEMBER 2007:

 

Month/Year

Aberdeen

Watertown

Pierre

NOV07

+1.8

+3.2

+2.2

DEC07

-4.6

-2.6

-0.4

JAN08

-3.8

-1.0

+0.5

FEB08

-6.6

-4.6

-3.6

MAR08

-2.2

-2.2

-0.7

APR08

-3.5

-3.5

-2.8

MAY08

-3.5

-3.1

-5.0

JUN08

-2.7

-2.3

-4.3

JUL08

-0.6

+0.2

-2.6

AUG08

-0.5

+1.2

-0.3

SEP08

-0.1

+1.4

-1.4

OCT08

-0.8

+0.2

-1.7

NOV08

+2.6

+2.4

+1.5

DEC08

-7.4

-5.9

-6.8

JAN09

-4.8

-3.7

+0.7

FEB09

-3.4

-1.6

+0.1

MAR09

-3.3

-1.4

-3.3

APR09

-2.6

-1.3

-2.8

MAY09

-1.8

-0.3

-2.1

JUN09

-3.6

-2.4

-3.5

JUL09

-4.8

-4.7

-5.1

 


 

 

ABERDEEN (1893-2008) - AVG NUMBER OF DAYS IS BASED ON 30 YEAR NORMALS (1971-2000) 

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 100F:  2.3
2009….0

2008....0

2007....1
2006.....5
2005.....0
2004.....0

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 95F:  7.7
2009…..1

2008.....0
2007.....4
2006....10
2005.....3
2004.....0

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 90F: 20.5

2009…..6

2008.....10
2007.....13
2006.....17
2005.....14
2004.....2

RECORD HOTTEST TEMPERATURE:                            115 F (7/9/1936, 7/6/1936)
YEAR WITH THE MOST 100F TEMPERATURES:           1936 - 35 DAYS 
YEAR WITH THE MOST 95F TEMPERATURES:             1936 - 44 DAYS 
YEAR WITH THE MOST 90F TEMPERATURES:             1936 - 69 DAYS 
EARLIEST 90F TEMPERATURE:                                    4/4/1921
LATEST 90F TEMPERATURE:                                       10/16/1991
EARLIEST 100F TEMPERATURE:                                  5/1/1959
LATEST 100F TEMPERATURE:                                      9/22/1936

 

 


 

PIERRE (1933-2008)  - AVG NUMBER OF DAYS IS BASED ON 30 YEAR NORMALS (1971-2000) 

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 100F:  8.8
2009…...0

2008......0
2007.....10
2006.....14
2005.....14
2004.....4

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 95F:  21.6
2009…..7

2008.....5
2007.....20
2006.....37
2005.....32
2004.....16

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 90F: 42.7
2009…..17

2008.....19
2007.....44
2006.....60
2005.....53
2004.....32

RECORD HOTTEST TEMPERATURE:                            117 F (7/15/2006)
YEAR WITH THE MOST 100F TEMPERATURES:            1936 - 41 DAYS
YEAR WITH THE MOST 95F TEMPERATURES:              1936 - 58 DAYS
YEAR WITH THE MOST 90F TEMPERATURES:              1936 - 79 DAYS
EARLIEST 90F TEMPERATURE:                                    4/9/1976
LATEST 90F TEMPERATURE:                                       10/29/1933
EARLIEST 100F TEMPERATURE:                                  5/8/1934
LATEST 100F TEMPERATURE:                                       9/26/1974

 


 

WATERTOWN (1893-2008)  - AVG NUMBER OF DAYS IS BASED ON 30 YEAR NORMALS (1971-2000) 

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 100F:  0.8

2009….0

2008.....0
2007.....1
2006.....4
2005.....0
2004.....0

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 95F:  4.9
2009…..0

2008.....0
2007.....3
2006.....7
2005.....4
2004.....0

AVG NUMBER OF DAYS WITH TEMPERATURES AT OR ABOVE 90F: 14.9
2009…..3

2008.....4
2007.....13
2006.....17
2005.....14
2004.....2

RECORD HOTTEST TEMPERATURE:                            110 F (7/20/1934)
YEAR WITH THE MOST 100F TEMPERATURES:            1933 - 17 DAYS
YEAR WITH THE MOST 95F TEMPERATURES:              1936, 1933 - 34 DAYS
YEAR WITH THE MOST 90F TEMPERATURES:              1933 - 53 DAYS
EARLIEST 90F TEMPERATURE:                                    4/2/1910
LATEST 90F TEMPERATURE:                                       10/5/1963
EARLIEST 100F TEMPERATURE:                                  5/28/1934
LATEST 100F TEMPERATURE:                                      9/10/1931

 

 


Mike Fowle - Science and Operations Officer



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