More counterexamples.
Here are a few of the highlights from the coldest month on record (since 1949) in Bridgeport. No, not this month, we’re talking about February 2015.
The average temperature for the month was 19.9°, making it not only the coldest February on record, but the coldest month of any month since 1949 by at least 2°! The second coldest month was January 2004.
Every single day was colder than normal, and nearly 2/3 of the days were at least 10° colder than normal. The month averaged a whopping 12.6° below normal!