Historical weather data, all-time temperature records, and monthly climate averages for Markham, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Markham runs cool, with an average high of 54° and a low of 34° across 72 years of records. The date has swung wildly though — from a balmy 76° in 2005 to a teeth-chattering 18° back in 1995. There's about a one-in-three chance of some rain, but snow is off the table.
Markham earns its Midwest stripes with a 130-degree spread between its all-time extremes — a scorching 103° in August 1988 and a brutal -27° in January 1985. A single July day in 1996 dropped 6.55 inches of rain, and a February 2011 snowstorm buried the town under 19 inches in one shot.
Summer is the sweet spot, with late July averaging highs of 85° and also bringing the heaviest rain — about 1.29 inches per week. Winter bites hard, with mid-January highs averaging just 29°. Spring and fall offer mild transitions, with April climbing to a 59° average and October holding at 64° before the cold sets in.