The average high and low for October 31 is 48 and 29 degrees. Given that, a rough estimate of an average temperature when most kids are trick or treating would be approximately 40 degrees. Of course with a temperature that cold (or often colder), it is no wonder that designing a costume around hats, mittens and jackets is often a requirement.
But every once in a while we get treated to mild Halloween temperatures. On four occasions since 1881 the high temperature has reached 70 degrees or higher. Many of you may still remember the 74 degree high recorded in 1999, or the 72 degree high in 1990. Although 70 degree Halloweens have been rare, 60 degree or higher days are a bit more common as the high has been in the 60s on 19 occasions.
If everything works out well, Monday in fact, could be our 20th such occurrence and our first in 10 years. Meaning Halloween 2011 could be the warmest Halloween that most of the kids out tonight have ever experienced. We will find out on Monday. But it is looking promising at the moment.