Historical weather data, all-time temperature records, and monthly climate averages for Carpentersville, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Carpentersville sits squarely in the temperamental heart of spring — expect a high near 55° and a low around 33°, with nearly a 4-in-10 chance of rain. The date has seen wild swings over 119 years of records, from a balmy 78° back in 1921 to a brutal 17° low in 1982.
Carpentersville weather doesn't mess around at the extremes — the thermometer has climbed as high as 103° (July 1, 1910) and plunged as low as -27° (January 20, 1985), a swing of 130 degrees. A single July day in 2010 dropped 6.47 inches of rain, and a January 1966 storm buried the area under 16.5 inches of snow.
Summer is the sweet spot here, with mid-July highs averaging 85° and the warmest stretch running July 16–22. Winter is legitimately cold — January highs average just 28°, bottoming out in the Jan 15–21 window. If you're trying to dodge rain, avoid mid-June, when weekly precipitation averages over an inch.