Issued 130 pm CDT Tue Sep 1 2009 Updated 415 pm CDT Wed Sep 2 2009 JPC
Summer 2009 in southern Wisconsin was rather cool. Madison set a record for the coolest July ever. For June, July, and August, the summer of 2009 came in tied for the 11th coolest average temperature.
Updated to add graphics
Weather charts for the period June 1 through August 31st revealed that the Jet Stream was unusually far south into the Great Lakes region during the summer. This caused lower than normal pressure over the East Coast and higher pressures over the northern Rocky Mountains. Thus, the flow over Wisconsin was stronger than normal from the north and northwest, bringing cooler and drier air down from Canada on a more frequent basis. On the following charts, H refers to higher than normal pressure and L to lower than normal pressure. W refers to warmer than normal and C to cooler than normal.
For additional background articles on the cool and dry summer, please check here:
Here is the table comparing this summer to the coolest ever summers in Madison.
Madison, Coolest June, July, August and year
Here is a summary of the departure from normal
Summer -2.1 -0.98
Jeff Craven, Science and Operations Officer
National Weather Service, Milwaukee/Sullivan WI