Streamwood, IL Weather & Climate Normals
Streamwood's real weather, in one number
Streamwood, IL scores 44/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 5 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Streamwood's hottest and coldest months
Streamwood's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 23°F, a 51.2°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Streamwood
Streamwood averages 38.02in of precipitation a year across roughly 129 days with measurable rain or snow, and 34in of snow a year.
Where Streamwood ranks
Streamwood ranks 3708 of 4876 US cities in this dataset for comfort score, and 172 of 330 within IL. About 38,360 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from STREAMWOOD, IL US, 0.3 miles from Streamwood, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure