Cold First Half of October...Updated Oct 19th

As probably most people in Southern Wisconsin and across other areas of the United States have noticed, temperatures so far this month have been unseasonably cold.  For the most part, a persistent cold air mass settled over the Northern United States during the first half of October bringing below average temperatures for the majority of the United States.  For Southern Wisconsin, temperatures have been below average for 21 consecutive days dating back to September 28th.  Let's take a look at how cold it's been and how this cold stretch compares to past years at Milwaukee and Madison.

The first 18 days in October at Milwaukee has seen an average high of 52.0°F and an average low of 40.6°F.  This equates to an average temperature of 46.3°F or 7.8°F below average for the time period.  Comparing it to past years, this has been the 4th coldest first 18 days of October at Milwaukee.

Here's the top 10 coldest first 18 days of October for Milwaukee:

Rank Avg Temp Year
1 42.4 1876
2 43.5 1875
3 46.2 1952
4 46.3 2009
5 46.5 1917
6 47.6 1977
7 47.9 1872
8 48.5 1981
9 48.8 1987
10 48.9 1925

The first 18 days in October at Madison has seen an average high of 50.3°F and an average low of 36.6°F.  This equates to an average temperature of 43.5°F or 8.6°F below average for the time period.  Comparing it to past years, this ties for 2nd coldest first 18 days of October at Madison.

Here's the top 10 coldest first 18 days of October for Madison:

Rank Avg Temp Year
1 42.4 1876
2 43.5 2009
3 43.6 1875
4 43.9 1952
5 45.1 1979
6 45.3 1917
7 45.8 1977
8 46.2 1987
9 47.0 1891
10 47.2 1978

 



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