Effingham (IL) Temperature by Month
Effingham in Illinois, United States of America sees significant seasonal temperature differences, with daytime highs between 3°C (37°F) in January and 30°C (86°F) in July, averaging 18°C (64°F) annually. Explore the full monthly breakdown below.
Effingham Monthly Temperatures
In Effingham, temperatures can shift dramatically between very warm in summer and cold in winter. Nights follow the same pattern, with lows ranging from 19°C (66°F) in July to -7°C (19°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Effingham by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest.
The chart below shows the average temperature throughout the year:
Temperature: Effingham 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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Effingham vs World: Temperature Compared
Effingham's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
Beijing, China averages 20°C (68°F) annually, but with big seasonal swings — very cold winters and hot summers.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
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 Effingham this rarely lasts long on the ground.
For more on Effingham's weather — including monthly rainfall, sunshine hours, and humidity — visit our Effingham climate page.
