Historical weather data, all-time temperature records, and monthly climate averages for Darien, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Darien sits right in the heart of spring's unpredictability — nearly half of all years on record have seen precipitation, and temperatures have swung from a brutal 16° in 1975 to a shirt-sleeve 80° back in 1929. Today's expected range of 36° to 53° is solidly average for the date, though 'average' here means anything can happen.
Darien's weather has real teeth at both extremes — the thermometer has touched 107° in June 1934 and plunged to -25° in January 1985, a swing of 132 degrees. A single July day in 1957 dropped 6.16 inches of rain, and a January 1999 storm buried the area under 17.6 inches of snow.
Summer is the main event, with highs peaking around 85° the second week of July and a wet stretch in late July averaging over an inch of rain per week. Winter bottoms out mid-January with average highs of just 31°, making December through February a hard pass for anyone who minds the cold. Spring and fall offer a brief sweet spot — May hits 71° and September holds at 76° before the chill returns.