Southern Wisconsin has experienced high temperatures of 5 to nearly 20 degrees above normal for over a week. While high temperatures are typically in the lower to middle 60s this time of year, they've managed to climb to 70 degrees or higher for the past 9 days in Milwaukee, and the past 10 days in Madison, through and including Wednesday, October 12th.
The only times that Milwaukee experienced 9 or more consecutive days in October with maximum temperatures of 70 degree or higher occurred in both 1953 and 1947. In both years, high temperatures reached or exceeded 70 degrees for a 9-day stretch, from October 14th through October 22nd. We could find no 10-day stretches of maximum temperatures 70 degrees or higher in Milwaukee for the month of October, going back to 1871. Maximum temperatures in the lower to mid 60s are expected in Milwaukee today, Thursday, October 13th. So, a new 10 consecutive-day record will not be set.
The 10-day stretch of maximum temperatures reaching 70 degrees or higher in Madison this October is the second longest strech on record, dating back to 1869. Madison's longest October stretch with maximum temperatures of 70 degrees or higher occurred in 1879. In that year, the run reached an incredible 17 days, from October 1st through October 17th! For your information, Madison had 9-day stretches in 1963 and 1946. Madison's current streak of 10 days will not be extended, since today's maximum temperature is expected to be in the mid 60s.
A strong upper level disturbance will move into the Upper Midwest today, and will move eastward through the western Great Lakes region tonight and Friday.
This disturbance will be accopanied by a cold front, which will move through southern Wisconsin today. The combination of all these weather features will continue to bring showers to southern Wisconsin. Showers will continue over mainly eastern Wisconsin tonight, with showers tapering off across western Wisconsin. Slight chances for showers will linger Friday, a result of the upper level disturbance combining with weakly unstable conditions in the low levels of the atmosphere. Brisk west northwest winds will develop tonight and Friday, allowing temperatures to cool off into the 50s by Friday.