A. We tend to remember those Halloweens with bad weather. Slogging through rain or snow in costumes with trick-or-treat bags is tough. But according to Dr. Ed Hopkins of the Wisconsin State Climatology Office, in the last 30 years (1981-2010), Madison has had only 10 Halloween days when measurable precipitation (0.01 inches or greater) fell, which translates to a probability of 33 percent that rain falls on that date.
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