Romeoville (IL) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Romeoville

Romeoville average temperature chart (Celsius) Romeoville average temperature chart (Fahrenheit)
Average monthly temperatures in Romeoville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -1.8 0.9 7.7 15.1 21.6 27 28.9 27.6 23.9 17.4 9 1
°F 28.8 33.6 45.9 59.2 71 80.6 84 81.6 75 63.2 48.1 33.8

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Romeoville monthly rainfall chart (mm) Romeoville monthly rainfall chart (inches)
Average monthly rainfall in Romeoville (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 41 36 68 99 92 103 103 94 91 65 71 63
inches 1.6 1.4 2.7 3.9 3.6 4.1 4.1 3.7 3.6 2.5 2.8 2.5
Rainy days 11 9 12 12 11 10 10 9 9 9 11 12

Average annual rainfall in Romeoville: 879.9mm (346.4 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Romeoville

Romeoville average daily sunshine chart
Average daily sunshine Romeoville
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5 5.5 6.5 7.8 9.6 11.1 11 9.8 8.2 6.9 4.3 3.9

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Romeoville average minimum / maximum temperatures (Celsius) Romeoville average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Romeoville (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -11.1 -8.7 -2.2 3.6 9.1 14.5 17.1 16 11.8 5.4 -0.4 -7.4
Max °C -1.6 1.1 8 15.4 22 27.3 29.2 27.9 24.2 17.7 9.2 1.2
Min °F 12.1 16.3 28.1 38.5 48.3 58.1 62.7 60.7 53.2 41.6 31.3 18.7
Max °F 20.7 25.2 37.2 49.1 59.9 69.6 73.6 71.4 64.4 52.7 39.9 26.4

Sea temperature

The graph below shows the average sea temperature.

Romeoville average sea temperature chart (Celsius) Romeoville average sea temperature chart (Fahrenheit)
Average sea temperature around Romeoville in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5.7 5 5.1 6 8.1 12.5 18.1 21.2 19.4 14.3 10 7.2
°F 42.2 41.1 41.1 42.8 46.6 54.5 64.6 70.2 66.8 57.7 50.1 45

Wind speed

The graph below shows the average wind speed.

Romeoville average winspeed by month (km/h) Romeoville average winspeed by month (mph)
Average wind speed in Romeoville (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 20 19 21 21 18 16 14 14 15 17 18 19
mph 12 12 13 13 11 10 9 9 9 11 11 12

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Romeoville relative humidity averages
Average relative humidity in Romeoville
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
73% 73% 70% 65% 65% 66% 70% 72% 72% 70% 74% 77%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Romeoville weather stats

Romeoville weather statistics
Hottest month: July 28.9°C 84°F
Driest month: February 36mm 1.4ins
Sunniest month: July 11hrs
Coldest month: January -1.8°C 28.8°F
Wettest month: July 103mm 4.1ins
Warmest sea: August 21.2°C 70.2°F
Map showing location of Romeoville (41.64753, -88.08951) Romeoville map pin © Google

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