Historical weather data, all-time temperature records, and monthly climate averages for Douglas, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Douglas runs mild but unpredictable — the historical average high is 55° with a low around 37°, but this date has swung from a balmy 78° in 2021 down to a teeth-chattering 24° in 2018. There's about a one-in-three chance of rain today, though snow is essentially off the table.
Douglas doesn't mess around at the extremes — the thermometer has hit 104° in the dead of summer (July 1999) and plunged to -22° in January 2019, a swing of 126 degrees. A single October day in 2017 dropped 5.2 inches of rain, and December 2000 buried the area under 14.3 inches of snow.
Summer is the headliner here, with highs averaging 85-86° in mid-July and comfortable mid-80s stretching through August. If you're cold-averse, January and February are brutal — highs barely crack the mid-30s during the coldest stretch of the year. Plan rain gear for May, which is the wettest month and anchors the soggiest week of the calendar.