Saint Charles (IL) monthly weather averages

Contents

Average daytime temperature

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

Saint Charles average temperature chart (Celsius) Saint Charles average temperature chart (Fahrenheit)
Average monthly temperatures in Saint Charles (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -2.3 0.3 7.1 14.7 21.2 26.6 28.5 27.4 23.5 17 8.5 0.5
°F 27.9 32.5 44.7 58.4 70.2 79.9 83.3 81.3 74.2 62.6 47.2 33

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.

Saint Charles monthly rainfall chart (mm) Saint Charles monthly rainfall chart (inches)
Average monthly rainfall in Saint Charles (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 42 35 66 98 90 106 104 98 92 65 70 62
inches 1.6 1.4 2.6 3.9 3.5 4.2 4.1 3.9 3.6 2.6 2.8 2.4
Rainy days 11 9 12 12 11 10 10 9 9 9 11 11

Average annual rainfall in Saint Charles: 881.967mm (347.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Saint Charles

Saint Charles average daily sunshine chart
Average daily sunshine Saint Charles
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5 5.5 6.5 7.7 9.6 11 10.9 9.8 8.1 6.8 4.3 3.9

Day / night temperatures

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

Saint Charles average minimum / maximum temperatures (Celsius) Saint Charles average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Saint Charles (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -11.8 -9.5 -2.9 3.1 8.5 13.9 16.6 15.6 11.3 4.9 -1.1 -8.2
Max °C -2.1 0.5 7.3 15 21.6 26.9 28.8 27.7 23.8 17.3 8.7 0.8
Min °F 10.9 14.9 26.8 37.5 47.2 57 61.9 60 52.3 40.8 30 17.3
Max °F 19.6 23.9 36 48.2 59 68.7 72.9 70.9 63.5 52 38.8 25.3

Sea temperature

The graph below shows the average sea temperature.

Saint Charles average sea temperature chart (Celsius) Saint Charles average sea temperature chart (Fahrenheit)
Average sea temperature around Saint Charles 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.

Saint Charles average winspeed by month (km/h) Saint Charles average winspeed by month (mph)
Average wind speed in Saint Charles (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 19 19
mph 12 12 13 13 11 10 9 9 9 11 12 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.

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

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Saint Charles weather stats

Saint Charles weather statistics
Hottest month: July 28.5°C 83.3°F
Driest month: February 35mm 1.4ins
Sunniest month: July 10.9hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: June 106mm 4.2ins
Warmest sea: August 21.2°C 70.2°F
Map showing location of Saint Charles (41.91419, -88.30869) Saint Charles map pin © Google

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