Rock Island, IL Weather & Climate Normals
Rock Island's real weather, in one number
Rock Island, IL scores 38/100 on this site's reading of NOAA's own 30-year normals: weather-driven. Heat, cold, snow, or rainfall here are heavy enough that they shape daily life for a large part of the year. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Rock Island's hottest and coldest months
Rock Island's hottest month is Jul, averaging 76°F; its coldest is Jan, averaging 23°F, a 52.2°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Rock Island
Rock Island averages 38.27in of precipitation a year across roughly 117 days with measurable rain or snow, and 36.1in of snow a year.
Where Rock Island ranks
Rock Island ranks 4694 of 4876 US cities in this dataset for comfort score, and 300 of 330 within IL. About 36,434 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from MOLINE QUAD CITY INTL AP, IL US, 3.2 miles from Rock Island, not a prediction for any specific day.
More on how this is worked out
What a 30-year climate normal actually is · Why this uses the nearest NOAA station