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Enhanced Risk for Severe Thunderstorms Across the Upper Midwest; Flash Flooding Possible from the Upper Midwest to Southern Plains and Desert Southwest Through Friday

Portions of the Upper Midwest will see an increased threat for severe thunderstorms through this evening, with a few strong tornadoes possible. The same region remains on alert for additional flash flood concerns. Heavy rainfall may lead to flash flooding across the Desert Southwest today, and Southern Plains by Friday. Finally, Major-to-record river flooding continues across the Carolinas. Read More >

During the month of July, temperatures across much of the Northern Plains, including portions of South Dakota and west-central Minnesota were well below normal .  Aberdeen, Watertown and Pierre all ended up being in the top 10 for the coldest Julys on record.  

A few other interesting heat related tidbits from this “cool” July are listed below:
 
  • Aberdeen has failed to reach 90 F this July. This is only the third time this has occurred since 1893 (the other years were 1915, 1962, and 1996).
 
  • The highest temperature recorded in Watertown this July has been 83 F. This is the “coolest” monthly maximum temperature ever recorded in July. Records in Watertown date back to 1893.
 
  • Like the summer of 2008, Pierre has yet to record a 100 F temperature during the summer of 2009. In fact, the last time Pierre reached 100 F was on 4 September 2007. Since 1933, Pierre has never experienced back to back summers when the temperature failed to reach 100 F.
 
 
 
Top Ten Coldest Average July Temperatures in Aberdeen (1893-2009)
 
 

 

Value

Year(s)

1

64.2

1992

2

64.5

1915

3

67.1

1904

4

67.2

1950,1962

5 

67.4

2009 

6

67.5

1905

7

67.8

1958,1996

8

68.0

1895

9

68.1

1918

10 68.2 1971

 
 
 
 
Top Ten Coldest Average July Temperatures in Watertown (1893-2009)
 
 

 

Value

Year(s)

1

62.9

1992

2

64.1

1915

3

65.0

1906

4

65.7

2009 

5

65.8

1927

6

65.9

1905

7

66.7

1950

8

66.8

1918

9

67.1

1971

10

67.2

1913, 1925

 
 
 
Top Ten Coldest Average July Temperatures in Pierre (1933-2009)
 

 

Value

Year(s)

1

66.3

1992

2

69.8

1993

3

70.3

1972

4

70.4 2009

5

70.5

1950

6

70.7

1958

7

70.8

1971

8

71.5

1962

9

71.9

1994

10

72.4

1951, 1979

 


NWS Aberdeen SD