What’s the climate like in Romeoville?
The current climate of Romeoville features average monthly temperatures ranging from highs of 28°C during the day to lows of 0°C. 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.
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.
On average, Romeoville gets 856 mm of precipitation each year. Of this, about 103 cm is snowfall. For comparison, London gets 701 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 good 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.
Climate Table of Romeoville
The climate table of Romeoville shows the average temperatures, precipitation, snow, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Precipitation |  |
|
|
|
|
|
|
|
|
|
|
|
| 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.
- Average yearly temperature: 16°C
- Highest temperature: 28°C in June, July and August
- Lowest temperature: 0°C in January
- Precipitation*: 856 mm per year, averaging 71 mm per month
- Snowfall: 103 cm per year
- Driest months: 26 mm in January, 36 mm in February and 39 mm in November
- Wettest months: 142 mm in June, 112 mm in July and 106 mm in May
*Precipitation is measured as a combination of rain, snow, and hail
Plan your next holiday
Don’t miss the best holiday deals for Romeoville and see what our partners have for you.
Table of Contents
Average Temperature per Month in Romeoville
This graph shows the average maximum temperatures per month in Romeoville, Illinois. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Romeoville
This graph shows how much precipitation Romeoville, Illinois, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average Snowfall per Month in Romeoville
This graph shows how much snow Romeoville, Illinois, gets on average per month. The amount of snowfall is measured in centimetres and the average is calculated based on the recorded snowfall per month from past years.
Average UV Index per Month in Romeoville
This graph 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.
Yearly Temperature in Romeoville
This graph shows the average yearly temperature in Romeoville, Illinois. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Romeoville
This chart shows the total yearly precipitation in Romeoville, Illinois, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Total Yearly Snowfall in Romeoville
This chart shows the total yearly snowfall in Romeoville, Illinois, over the past few years. The total yearly snowfall, measured in centimetres, is the sum of all the snow that fell in the twelve months of that year.
Weather experiences in Romeoville
Have you been to Romeoville?
Share your weather experiences in Romeoville.
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.
