Where did this record occur? Certainly not where I live in Wisconsin, nor in major cities south and southwest.
 
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Milwaukee/Sullivan, WI
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Very Warm September 2015 (Updated 10/1)
Weather.gov > Milwaukee/Sullivan, WI > Very Warm September 2015 (Updated 10/1)
What do you think of when you think of September? The beginning of Autumn? Fall colors? Cooler temperatures? If you thought of the cooler temperatures, then the temperatures this month might come as a little bit of a shock to you. A large ridge pattern over the central United States has helped to bring in much warmer than normal temperatures to southern Wisconsin. However, a cold front moved through the morning of September 29th, bringing more seasonal temperatures to southern Wisconsin.
Below are the top 10 warmest Septembers on record for Milwaukee:
Milwaukee:
| Rank | Average Temp (°F) | Year | | 1 | 69.6 | 1931 | | 2 | 68.6 | 2005 | | 3 | 68.5 | 1933 | | 4 | 67.8 | 1908 | | 5 | 67.6 | 2015 | | T6 | 67.5 | 1906,1939,1994 | | 9 | 67.3 | 1897 | | T10 | 67.2 | 1891,1921 |
For September 2015, the average temperature in Milwaukee was 67.6 degrees F. This was the 5th warmest September on record. The month was 4.5 degrees above average.
Below are the top 10 warmest Septembers on record for Madison:
Madison:
| Rank | Average Temp (°F) | Year | | 1 | 68.4 | 1931 | | 2 | 67.9 | 1897 | | T3 | 67.2 | 1933,1895,1891 | | T6 | 67.1 | 2015, 1908 | | 8 | 67.0 | 1881 | | T9 | 66.8 | 2005,1939 |
For September 2015, the average temperature at Madison was 67.7 degrees F. This was a tie for 6th warmest on record. The month was 6.1 degrees above average.
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