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United StatesThe climate of Romeoville
The current climate in Romeoville features temperatures ranging from a high of 28°C to a low of 0°C throughout the year. The average yearly temperature is around 16°C. At night, temperatures in the colder months average around -8°C and in the warmer months around 18°C.
Average temperatures and precipitation
This chart shows the average monthly maximum and minimum temperatures (in degrees Celsius) and average monthly rainfall (in millimeters) for Romeoville, Illinois.
Temperature records
The highest temperature recorded in Romeoville in recent years was 37°C in June 2022. The lowest daytime temperature recorded was -24°C in January 2019.
Precipitation and snowfall
On average, Romeoville gets 856 mm of precipitation each year. Of this, about 103 cm is snowfall. For comparison, New York gets 1142 mm of precipitation each year.
Best time to visit Romeoville?
The best time to visit Romeoville for sunny weather is May and July through October. During this period, you'll have nice temperatures and not too much rain, making it a great time to visit Romeoville. In the other months of the year, there's too much rain or the temperature isn't ideal for a visit if you want sunny and pleasant weather.
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Climate Table of Romeoville
The climate table of Romeoville shows the average temperatures, rainfall, snow, and UV index per month. The table provides an overview of the average day and night temperatures in degrees Celsius, the total amount of rainfall in millimeters, the total snowfall in centimeters, and the UV index for each month. Rainfall is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 0 | 1 | 8 | 16 | 22 | 28 | 28 | 28 | 25 | 18 | 10 | 4 |
| Temp. min (°C) | -8 | -8 | -1 | 5 | 11 | 16 | 18 | 18 | 15 | 8 | 1 | -3 |
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| Precipitation (mm) | 26 | 36 | 49 | 62 | 106 | 142 | 112 | 92 | 58 | 86 | 39 | 48 |
| Snow (cm) | 42 | 31 | 9,4 | 1,1 | 0 | 0 | 0 | 0 | 0 | 0,5 | 4,8 | 14 |
| UV Index | 2 | 2 | 4 | 4 | 6 | 6 | 7 | 6 | 4 | 4 | 2 | 2 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
Temperature charts
These charts display the average temperatures in Romeoville, Illinois. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Average Temperature per Month in Romeoville
Yearly Temperature in Romeoville
Precipitation charts
These charts show the average amount of precipitation in Romeoville, Illinois. Precipitation is always measured as water, even when it falls as snow or hail. The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Average Precipitation per Month in Romeoville
Total Yearly Precipitation in Romeoville
Average Snowfall per Month in Romeoville
Total Yearly Snowfall in Romeoville
UV index chart
This chart shows the average UV index per month in Romeoville, Illinois. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Average UV Index per Month in Romeoville
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Average weather in Romeoville by month
Click on a month below to see detailed weather info for Romeoville. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.