Typical crowd level each month (relative), averaged over the attractions of each city. Shorter bar = fewer people.
Chicago and San Francisco have broadly similar crowd levels overall.
Based on historical visitor patterns, January is usually the quietest month in Chicago.
Based on historical visitor patterns, January is usually the quietest month in San Francisco.
In Chicago the quietest day is usually Monday; in San Francisco, Monday. Weekdays early in the morning are the safest bet in both.
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