Macomb (IL) Temperature by Month

The average annual maximum temperature in Macomb, Illinois, United States of America is 17°C (63°F), with daytime highs ranging from 1°C (34°F) in January to 29°C (84°F) in July. This page covers monthly averages, day-night differences, and how Macomb compares to cities worldwide.

Visitors to Macomb will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 18°C (64°F) in July to -9°C (16°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Macomb by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM.

The chart below shows the average temperature throughout the year:

Macomb's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Macomb this rarely lasts long on the ground.

For more on Macomb's weather, including monthly rainfall, sunshine hours, and humidity, visit our Macomb climate page.