Historical weather data, all-time temperature records, and monthly climate averages for Carol Stream, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Carol Stream runs mild but variable — expect a high around 54° and a low near 33°, based on 28 years of data. The date has swung wildly, from a balmy 76° back in 2005 to a bitter 23° low in 2013. There's about a 1-in-3 chance of rain, but snow is essentially off the table.
Carol Stream doesn't mess around at the extremes — the thermometer has touched 100° in July and cratered to -29° in January 2019, a brutal 129-degree spread between all-time records. The wettest single day on record dropped 6.02 inches on September 13, 2008, the kind of soaking that defines a Midwest storm.
Summer is the sweet spot here, with highs peaking around 84-85° in mid-July, while mid-January bottoms out at a frigid 28°. If you're planning around rain, avoid early May — that week averages 1.35 inches of precipitation, the wettest stretch of the year. Spring and fall offer a comfortable middle ground in the 60s and 70s.