Monmouth, IL Weather & Climate Normals
Monmouth's real weather, in one number
Monmouth, IL scores 45/100 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.
Monmouth's hottest and coldest months
Monmouth's hottest month is Jul, averaging 74°F; its coldest is Jan, averaging 23°F, a 50.9°F swing across the year, one of the widest gaps in this dataset.
Rain and snow in Monmouth
Monmouth averages 39.42in of precipitation a year across roughly 99 days with measurable rain or snow, and 25.6in of snow a year.
Where Monmouth ranks
Monmouth ranks 3512 of 4876 US cities in this dataset for comfort score, and 149 of 330 within IL. About 8,639 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from MONMOUTH, IL US, 2.1 miles from Monmouth, 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