Historical weather data, all-time temperature records, and monthly climate averages for Galesburg, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Galesburg lands in that in-between stretch of spring — average highs of 56° and lows of 34° mean you're not out of coat territory yet. The date has seen a 47-degree spread in recorded history, from a bitter 17° in 1977 to a shirt-sleeve 81° in 1988. There's a 32% chance of rain today, but snow is essentially off the table.
Galesburg knows weather extremes — the thermometer has swung a staggering 140 degrees between its all-time records, from a scorching 112° in July 1936 to a brutal -28° in February 1905. A single storm dropped 7.7 inches of rain on September 8, 1927, and the February 2011 blizzard buried the city under 15 inches of snow in one day.
Summer is the main event here, with highs peaking around 85° the week of July 9–15 before gradually easing into a golden fall. Winters are legitimately cold — late January through early February averages just 30° for a high — so plan accordingly. If you're hoping to avoid rain, steer clear of late June, the wettest stretch of the year.