Sparta (IL) Temperature by Month
Sparta in Illinois, United States of America sees significant seasonal temperature differences, with daytime highs between 5°C (41°F) in January and 31°C (88°F) in July, averaging 19°C (66°F) annually. Explore the full monthly breakdown below.
Sparta Monthly Temperatures
The weather in Sparta experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 20°C (68°F) in July to -5°C (23°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Sparta by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 311 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Sparta 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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Sparta vs World: Temperature Compared
Sparta's average annual maximum temperature is 19°C (66°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.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
What Does the Temperature Feel Like in Sparta?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Sparta, January is the coolest month, with average highs of 5°C (41°F) and humidity around 72% — considered high. In July, the warmest month, temperatures average 31°C (88°F) with 68% humidity — conditions that feel high. For a full picture, see our humidity page.
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.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Sparta's weather — including monthly rainfall, sunshine hours, and humidity — visit our Sparta climate page.
