Historical weather data, all-time temperature records, and monthly climate averages for Roscoe, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Roscoe runs cool, with average highs of 53° and lows dipping to 33° — still jacket weather. The date has a wild range in the record books, from a balmy 80° back in 1929 to a bitter 16° in 1926. There's about a 1-in-3 chance of some precipitation today, though snow is unlikely at just 4%.
Roscoe's weather history is not for the faint of heart — this northern Illinois town has swung from a scorching 110° in July 1936 to a bone-crushing -29° in January 2019, a spread of 139 degrees. The wettest single day on record dropped 6.55 inches of rain in June 1898, and a February 2011 snowstorm buried the area under 15 inches in one shot.
Roscoe peaks in mid-July with average highs around 84-85°, making late summer the sweet spot for warm-weather visits. Winters are legitimately cold — late January averages just 28° for a high — so plan accordingly if you're heading there in the deep freeze. June is the wettest month on average, with the rainiest stretch typically falling around the 11th through 17th.