Mattoon (IL) Temperature by Month
Mattoon in Illinois, United States of America sees significant seasonal temperature differences, with daytime highs between 2°C (36°F) in January and 30°C (86°F) in July, averaging 17°C (63°F) annually. Explore the full monthly breakdown below.
Mattoon Monthly Temperatures
Depending on the time of the year, temperatures range from warm to cold in Mattoon. Nighttime lows follow the same pattern, ranging from 19°C (66°F) to -7°C (19°F).
The chart below illustrates the average maximum day and minimum night temperatures in Mattoon by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Mattoon vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Mattoon vs World: Temperature Compared
Mattoon'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:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Mattoon's weather — including monthly rainfall, sunshine hours, and humidity — visit our Mattoon climate page.
