Chester (IL) monthly weather averages

Contents

Average daytime temperature

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

Chester average temperature chart (Celsius) Chester average temperature chart (Fahrenheit)
Average monthly temperatures in Chester (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 4.1 7 13.3 19.8 24.9 29.6 31.7 30.6 26.7 20.9 13.2 6.2
°F 39.3 44.6 56 67.6 76.8 85.3 89.1 87.2 80.1 69.7 55.7 43.2

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.

Chester monthly rainfall chart (mm) Chester monthly rainfall chart (inches)
Average monthly rainfall in Chester (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 56 69 114 101 116 89 103 92 86 77 100 94
inches 2.2 2.7 4.5 4 4.6 3.5 4.1 3.6 3.4 3 3.9 3.7
Rainy days 9 9 11 11 10 9 8 8 8 8 10 10

Average annual rainfall in Chester: 1045.567mm (411.6 inches)

Average daily sunshine

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

Chester average daily sunshine chart
Average daily sunshine Chester
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.5 6 6.9 8.3 9.5 10.8 10.9 10 8.6 7.6 5.2 4.7

Day / night temperatures

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

Chester average minimum / maximum temperatures (Celsius) Chester average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Chester (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -6.1 -3.9 1.8 7.3 12.2 17.1 19.4 18.1 14.2 7.6 2.4 -3.3
Max °C 4.3 7.3 13.6 20.1 25.2 29.9 32.1 31 27.1 21.3 13.5 6.5
Min °F 21 25.1 35.2 45.1 54 62.8 66.8 64.5 57.5 45.6 36.2 26.2
Max °F 30.4 35.1 45.9 56.7 65.7 74.3 78.3 76.1 69.1 57.9 46.2 34.9

Sea temperature

The graph below shows the average sea temperature.

Chester average sea temperature chart (Celsius) Chester average sea temperature chart (Fahrenheit)
Average sea temperature around Chester in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 10.9 10.4 11 12.5 14.9 17.9 21.1 23.6 22.2 18 14.7 12.4
°F 51.6 50.8 51.7 54.5 58.9 64.2 69.9 74.5 71.9 64.4 58.4 54.3

Wind speed

The graph below shows the average wind speed.

Chester average winspeed by month (km/h) Chester average winspeed by month (mph)
Average wind speed in Chester (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 18 18 19 18 16 14 13 13 13 15 17 18
mph 11 11 12 11 10 9 8 8 8 9 10 11

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.

Chester relative humidity averages
Average relative humidity in Chester
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
72% 71% 67% 64% 67% 68% 69% 71% 72% 68% 71% 74%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Chester weather stats

Chester weather statistics
Hottest month: July 31.7°C 89.1°F
Driest month: January 56mm 2.2ins
Sunniest month: July 10.9hrs
Coldest month: January 4.1°C 39.4°F
Wettest month: May 116mm 4.6ins
Warmest sea: August 23.6°C 74.5°F
Map showing location of Chester (37.91366, -89.82205) Chester map pin © Google

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