Does precipitation fall more often on the weekends?

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Dear Tom,
You have stated in this column that rain or snow do not happen more often on weekends than on weekdays, but I disagree. It does rain or snow more often on weekends.
— Jared Pasicovil, Chicago
Dear Jared,
You have fallen victim to the belief that precipitation falls more often on weekends, but it’s just not true. A bad experience with weekend weather can dominate our remembrance of past events. A weekend get-together buried by a fierce snowstorm, for example, will stand out in our memory more vividly than a similar event that comes off without a weather hitch.
A scan of Chicago’s precipitation records shows that measurable precipitation (0.01 inch or more) falls on either 33 or 34 percent of all days of the week: Sunday 33 percent, Monday 33 percent, Tuesday 34 percent, Wednesday 33 percent, Thursday 33 percent, Friday 34 percent, Saturday 33 percent.

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