ILLINOIS — Although meteorological spring begins on March 1, historical weather data shows that measurable snowfall in Illinois during the month remains a well documented occurrence.
Due to the state’s location in the Midwest and its exposure to cold air masses from Canada, winter conditions can persist well into March.
Illinois sits within a region where large scale weather systems frequently move across the central United States during late winter and early spring. During this time of year, cold air from the north can still interact with moisture moving northward from the Gulf of Mexico. When these ingredients combine, conditions may support snowfall across portions of the state.
Long term climate records maintained by the National Weather Service show that many Illinois cities average measurable snowfall in March.
Chicago, for example, has a historical March snowfall average of around 2 to 3 inches based on decades of climate observations at O’Hare International Airport. Cities farther south in the state, such as Springfield and Carbondale, typically see lower averages, though measurable snow has still been recorded many times in March.
Several significant late season snowstorms have affected Illinois in the past. One notable example occurred during the March 1993 “Storm of the Century,” which brought heavy snowfall and blizzard conditions across parts of the Midwest and eastern United States. Other March systems in different years have produced widespread accumulations of several inches across portions of Illinois.
Meteorologists note that snowfall in March can vary widely depending on temperature profiles and storm tracks. Because temperatures often fluctuate above and below freezing during this time of year, precipitation can fall as rain, snow, or a mixture of both. Additionally, snow that does accumulate may melt quickly due to warmer ground temperatures and increasing daylight hours.
Despite the seasonal transition toward spring, Illinois’ historical climate data clearly shows that measurable snowfall in March remains a possibility. While the frequency and amount vary from year to year, the state’s weather records demonstrate that winter conditions can still occur during the early spring period.
