November stands out in my experience as one of the most changeable weather months. The Polar Jet Stream is getting stronger and pushing south while the leftover pockets of summer warmth still remain across the country. Cold fronts become more defined due to the sharp temperature differences along them. Wild swings of nearly 40 degrees in the span of 24 hours in not unheard of. For example, back in 2005, the high on November 16th was 67 degrees. The high the following day was.....29!
All of that said, are these 60+ degree days in November become more common?
Let's split up the month into two halves. The chart below shows the 60+ degree days from November 1st to the 15th since 1980. The average per year is 4.4 days.
The 60+ degree days for the last half of November is obviously much lower. A third of the time we don't even have temps above 60!