Weather Forecast and Radar for McHenry, Illinois

Weather in McHenry, IL

McHenry, Illinois experiences all four seasons throughout the year. During the winter months, temperatures typically range from the low-to-mid twenties and can occasionally dip below zero. The coldest month is usually January, with an average temperature of 24°F (-4°C). Snowfall can vary greatly from year to year, but the average amount of snowfall over the course of a winter is around 28 inches (71 cm).

As the winter weather begins to wane and spring approaches, temperatures start to warm. April and May see average temperatures in the mid-fifties, with lows still in the thirties. The spring months can also bring some rain, with a total average of 5.1 inches (13 cm) over the course of the two months.

Summer in McHenry is warm and humid. Temperatures usually reach the mid-eighties, with lows rarely dipping below the mid-sixties. The highest temperature ever recorded in McHenry was 104°F (40°C) in July of 1936. The average amount of rain in the summer months is around 4.5 inches (11 cm).

Fall brings cooler temperatures and beautiful foliage. The average temperature in October is around 51°F (11°C), with lows in the mid-thirties. November temperatures are similarly mild, with average highs in the mid-forties and lows in the mid-twenties. Snowfall in the fall months is quite rare, with only about 2.5 inches (6 cm) of snowfall per year.

Fast Facts About McHenry, IL

As of 2020, the city population is 26889.

Major Cities Nearby McHenry, IL

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for McHenry, Illinois.