Historical weather data, all-time temperature records, and monthly climate averages for Northlake, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Northlake sits in that classic Chicago-area limbo — averages of 52° and 33° mean a light jacket is basically mandatory. The date has swung wildly over 67 years of records, from a balmy 76° in 2010 to a brutal 13° back in 1975. There's nearly a coin-flip chance of rain today, with a lingering 5% shot at snow.
Northlake's weather has real teeth — the thermometer has reached 104° in June and plunged to -27° in January, a 131-degree spread that defines Midwest extremes. A single July day in 2011 dumped 6.86 inches of rain, and a January storm in 1999 buried the area under 18.6 inches of snow.
Summer is the sweet spot, with mid-July highs averaging 85° — though that's also when the heaviest rain arrives, averaging over an inch a week. If you're cold-averse, avoid mid-January, when highs barely crack 29°. Spring and fall offer a comfortable middle ground, with April and October averaging 59° and 63° respectively.