Princeton (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Princeton.
Climate overview of Princeton
Princeton, Illinois, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 29°C (84°F) in July, while winters cool to -1°C (30°F) in January.
The city has a wet climate, receiving around 1019 mm (40 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and very cold winters. June is the wettest month.
Princeton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Princeton - and find the best time to visit.
Monthly Temperature in Princeton
Depending on the time of the year, temperatures range from comfortable to very cold in Princeton. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -1°C (30°F) in January.
Nighttime temperatures range from 18°C (64°F) in July to -10°C (14°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Princeton
Princeton has a relatively rain/snowy climate with high precipitation levels, averaging 1019 mm (40 in) of rain/snowfall annually. The seasons in Princeton bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 133 mm (5.2 in) of precipitation. This rainfall is distributed across 13 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 41 mm (1.6 in) over 8 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Princeton Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Princeton
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and September
- Warmest weather: June, July and August
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -10°C (14°F).
Frequently asked questions about the climate in Princeton
What is the best time to visit Princeton?
July and September typically offer the most optimal weather in Princeton. In contrast, January, February, March, November and December tend to have less optimal conditions. Princeton has warm summers and very cold winters.
What temperatures can I expect in Princeton?
Daytime highs range from -1°C (30°F) in January to 29°C (84°F) in July. Nighttime lows range from -10°C (14°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Princeton get?
Annual rainfall is around 1019 mm (40 in). June is the wettest month with 133 mm (5.2 in), while January is the driest with 41 mm (1.6 in).
Princeton 3-Day Forecast
Princeton (IL) 3-Day Forecast
Princeton on the map
Princeton is highlighted - select any city to see its climate.
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