The weather of Halloween can be interesting! The change of seasons often brings a variety of weather to the plateau and, with Halloween falling on the cusp of fall’s transition into winter, it can mean anything can happen on Halloween!
Records for this date begin with 1954, which just so happened to be a very cold Halloween! We even recorded a bit of snow. Still, other Halloweens have been quite warm, with 1984 having the warmest high temperature of 80 degrees. The wettest Halloween appears to 1961, when 1.34 inches of rain fell at the airport.
As with any data, there appears to be at least one fluke. If you notice the years 1964-1966 having identical highs and lows. It’s very unlikely that data is correct. It is interesting how so many years have such similar data.