DeKalb (IL) monthly weather averages

Contents

Average daytime temperature

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

DeKalb average temperature chart (Celsius) DeKalb average temperature chart (Fahrenheit)
Average monthly temperatures in DeKalb (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -2.7 -0 6.9 14.8 21.5 26.9 28.7 27.4 23.5 17 8.2 0
°F 27.1 31.9 44.5 58.6 70.7 80.4 83.7 81.3 74.3 62.6 46.8 32.1

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.

DeKalb monthly rainfall chart (mm) DeKalb monthly rainfall chart (inches)
Average monthly rainfall in DeKalb (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 37 30 63 92 91 110 100 101 96 67 68 54
inches 1.4 1.2 2.5 3.6 3.6 4.3 3.9 4 3.8 2.6 2.7 2.1
Rainy days 10 9 12 12 11 10 10 9 9 9 10 11

Average annual rainfall in DeKalb: 861.967mm (339.4 inches)

Average daily sunshine

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

DeKalb average daily sunshine chart
Average daily sunshine DeKalb
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.1 5.8 6.5 7.7 9.5 10.9 10.8 9.7 8.1 6.8 4.4 4

Day / night temperatures

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

DeKalb average minimum / maximum temperatures (Celsius) DeKalb average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in DeKalb (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -12.5 -10.2 -3.4 2.7 8.4 14 16.6 15.3 10.8 4.5 -1.7 -8.9
Max °C -2.5 0.2 7.2 15.1 21.8 27.2 29 27.7 23.8 17.3 8.5 0.3
Min °F 9.5 13.6 25.9 36.9 47.1 57.2 61.9 59.5 51.4 40.1 29 16.1
Max °F 18.5 23 35.4 48 59.2 69.1 73 70.7 63.1 51.6 38.1 24.3

Sea temperature

The graph below shows the average sea temperature.

DeKalb average sea temperature chart (Celsius) DeKalb average sea temperature chart (Fahrenheit)
Average sea temperature around DeKalb 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.

DeKalb average winspeed by month (km/h) DeKalb average winspeed by month (mph)
Average wind speed in DeKalb (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 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.

DeKalb relative humidity averages
Average relative humidity in DeKalb
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
74% 73% 71% 66% 65% 66% 71% 73% 73% 70% 75% 77%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

DeKalb weather stats

DeKalb weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 30mm 1.2ins
Sunniest month: July 10.8hrs
Coldest month: January -2.7°C 27.1°F
Wettest month: June 110mm 4.3ins
Warmest sea: August 21.2°C 70.2°F
Map showing location of DeKalb (41.92947, -88.75036) DeKalb map pin © Google

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