Record Cool July for Madison

Madison, WI: Coldest July in Recorded History           

July 2009 was remarkably cool from the Northern Plains to New England, including dry and cool conditions in southern Wisconsin. The overall large scale weather pattern has generally kept an upper level ridge over the western portion of the United States and an upper level trough over the eastern portion of the United States. This trough has brought cooler air from central Canada south and has kept much of the warm and moist air across southern portions of the United States.

Madison July Temperature Statistics:

The average temperature at Truax Field in Madison for July 2009 was a record 65.7 degrees or 5.9 degrees below normal.  The previous record was 66.7 degrees in 1891. Records go back to 1869.  It was also a dry month with 1.94" of rainfall.  This makes July 2009 the 7th driest on record for Madison.  The driest July was in 1909 when only 0.29" of rain fell.     

Here is a list of the top ten coolest July monthly temperatures for Madison:

 

Year

Average Temp

1

2009

65.7 °F

2

1891

66.7 °F

3

1967

67.1 °F

4

1992

67.2 °F

5

1962

67.3 °F

6

1996

67.5 °F

7

1915

67.7 °F

8

1960

67.8 °F

9

1972

68.3 °F

9

1965

68.3 °F

 

The average normal high temperature during the month of July is 82.1 degrees; this July it was 75.8 degrees or 6.3 degrees below normal.  The average normal low temperature during the month of July is 61.0 degrees; this July it was 55.5 degrees or 5.5 degrees below normal.

High temperatures only reached 80 degrees or more 7 different days during July with the highest temperature of 82 degrees reached on July 5th, 6th, and 27th. There has never been a July on record where the highest temperature for the month didn't reach at least 84 degrees.  The previous record was 84 degrees in 1869.

To give you a prospective of how cool this July's high temperatures have been, here is a list of the number of days Madison has reached a high of 83 degrees or higher during the month of July since 1995.

Year

 # Days 83 °F or above

2009

0

2008

13

2007

19

2006

20

2005

17

2004

5

2003

12

2002

22

2001

20

2000

6

1999

19

1998

12

1997

11

1996

5

1995

23

This graphic shows the high and low temperatures from May 1st through July.  Note how the blue bars representing the high and low temperature for each day does not reach above the average high (top of yellow shading) during the entire month of July.  Another interesting pattern is that high and low temperatures in July have varied very little compared to May and June of this year.  Click on the graphic for a larger image.


 


 Milwaukee July Temperatures:

The average temperature at Mitchell Field in Milwaukee for July 2009 was 68.6 degrees or 3.5 degrees below normal. This is not cool enough to be in the top 10 coolest on record.  However, it was dry and the 0.71" of rain that fell during July 2009 at Mitchell was the 4th driest on record.  The driest July was in 1936 when only 0.28" of rain fell.

Here is a list of the top ten coolest July monthly temperatures for Milwaukee:

 

Year

Average Temp

1

1891

65.5 °F

2

1875

66.0 °F

3

1882

66.5 °F

4

1962

66.7 °F

4

1884

66.7 °F

6

1915

66.8 °F

7

1960

67.1 °F

8

1981

67.3 °F

9

1992

67.7 °F

9

1924

67.7 °F

9

1920

67.7 °F

This graphic shows the high and low temperatures from May 1st through July.  Note how the blue bars representing the high and low temperature for each day during July are skewed toward the lower end of the normal temperature area indicating the below normal temperatures for this month.  As with Madison, a pattern is seen in the high and low temperatures for July varying less than during May and June. Click on the graphic for a larger image.  




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