Sycamore, IL Weather & Climate Normals
Sycamore's real weather, in one number
Sycamore, IL scores 43/100 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.
Sycamore's hottest and coldest months
Sycamore's hottest month is Jul, averaging 73°F; its coldest is Jan, averaging 21°F, a 52.6°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Sycamore
Sycamore averages 37.25in of precipitation a year across roughly 121 days with measurable rain or snow, and 33.1in of snow a year.
Where Sycamore ranks
Sycamore ranks 4015 of 4876 US cities in this dataset for comfort score, and 248 of 330 within IL. About 18,968 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from DE KALB, IL US, 6.6 miles from Sycamore, 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