Historical weather data, all-time temperature records, and monthly climate averages for Hanover Park, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Hanover Park sits right in that classic spring-in-flux zone — historically, highs have ranged from a pleasant 73° (1981) to a brutal 16° low the very next year in 1982. On average, expect a cool 53° high and a frosty 33° overnight. There's a coin-flip chance of rain today, though snow is nearly off the table at just 2%.
Hanover Park has seen the full extremes of Midwest weather, swinging from a scorching 103° in July 1974 to a jaw-dropping -28° on January 31, 2019. Summer storms can unleash serious rainfall — the wettest single day on record dumped 5.72 inches in July 2011, the same winter that also brought 17 inches of snow in a single day in February.
Summer is the clear sweet spot, with highs peaking around 82–83° in mid-July — also the wettest stretch of the year at over an inch of rain per week. Winters are genuinely cold, with January highs averaging just 27–29°, so plan accordingly. Spring and fall offer mild transitions, with April climbing to 58° and October holding at a comfortable 61°.