Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. 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

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Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Cool July Temperatures