ILLINOIS — While April typically marks a transition to milder spring weather across Illinois, historical records show that substantial snowfall—including totals approaching or exceeding one foot—has occurred in the state during the month.
According to data from the National Weather Service and the National Oceanic and Atmospheric Administration, Illinois has experienced several notable late-season snow events. These storms, though infrequent, demonstrate that winter conditions can persist or briefly return even well into spring.
One of the most significant examples occurred during the April 1–3, 1975 Midwest snowstorm, when parts of Illinois—particularly northern and central regions—received heavy snowfall.
Some areas reported totals near or above one foot, with widespread disruptions due to the timing of the storm after the traditional winter season.
Another notable event took place in April 1926, when a powerful late-season system brought double-digit snowfall totals to portions of the state. More recently, measurable April snow has been recorded in multiple years, though most modern events have produced lighter accumulations.
Such events require a precise alignment of atmospheric conditions.
Cold air must be present across the region, often driven southward from Canada, while a strong low-pressure system provides moisture. When temperatures remain low enough throughout the atmosphere, precipitation can fall as heavy, wet snow instead of rain—even in April.
Geography also plays a role. Northern Illinois, including cities like Chicago and Rockford, is more likely to experience accumulating April snowfall due to its proximity to colder air masses and, at times, lake-influenced weather patterns from Lake Michigan. Central Illinois, including Springfield, has also recorded April snow, though typically with less frequency and lower totals.
Climatological averages indicate that measurable snowfall in April is relatively uncommon across Illinois, and the likelihood of a single storm producing a foot of snow is low. However, historical precedent confirms that such an outcome is possible under the right conditions.
Experts also note that late-season snow can have greater impacts than winter storms, as trees and vegetation are often in early stages of growth. The weight of heavy, wet snow can lead to downed branches and power outages.
In summary, while rare, a foot of snow from a single April system in Illinois is supported by historical weather data. Records show that significant late-season snowstorms have occurred in the past and remain within the range of possibility.
