Harrisburg (IL) monthly weather averages

Contents

Average daytime temperature

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

Harrisburg average temperature chart (Celsius) Harrisburg average temperature chart (Fahrenheit)
Average monthly temperatures in Harrisburg (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 4.7 7.4 13.9 20.3 25.6 30.4 32.2 31.3 27.6 21.4 13.9 7.1
°F 40.5 45.3 57.1 68.5 78 86.7 89.9 88.4 81.6 70.5 57.1 44.8

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.

Harrisburg monthly rainfall chart (mm) Harrisburg monthly rainfall chart (inches)
Average monthly rainfall in Harrisburg (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 76 81 123 111 129 100 102 85 77 74 103 103
inches 3 3.2 4.9 4.4 5.1 3.9 4 3.3 3 2.9 4 4.1
Rainy days 10 9 12 11 10 9 9 8 8 8 10 10

Average annual rainfall in Harrisburg: 1111.667mm (437.7 inches)

Average daily sunshine

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

Harrisburg average daily sunshine chart
Average daily sunshine Harrisburg
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.2 5.8 6.8 8.3 9.6 11 11 10.3 8.8 7.6 5.2 4.5

Day / night temperatures

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

Harrisburg average minimum / maximum temperatures (Celsius) Harrisburg average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Harrisburg (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -5.6 -3.5 2.4 7.8 12.5 17.3 19.5 18.2 14.3 7.5 2.8 -2.8
Max °C 5 7.7 14.2 20.6 25.9 30.7 32.5 31.7 27.9 21.7 14.2 7.4
Min °F 22 25.8 36.3 46 54.5 63.1 67.1 64.7 57.7 45.5 37 27.1
Max °F 31.5 35.8 46.9 57.6 66.6 75.2 78.8 76.8 70 58.3 47.3 36.1

Sea temperature

The graph below shows the average sea temperature.

Harrisburg average sea temperature chart (Celsius) Harrisburg average sea temperature chart (Fahrenheit)
Average sea temperature around Harrisburg in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 10.6 10.1 10.5 12 14.6 18.1 21.7 24 22.5 18.2 14.6 12.2
°F 51.2 50.1 50.9 53.6 58.3 64.7 71.1 75.2 72.4 64.8 58.4 54

Wind speed

The graph below shows the average wind speed.

Harrisburg average winspeed by month (km/h) Harrisburg average winspeed by month (mph)
Average wind speed in Harrisburg (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 17 17 18 17 15 13 12 12 12 13 16 17
mph 10 11 11 11 9 8 7 7 7 8 10 10

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.

Harrisburg relative humidity averages
Average relative humidity in Harrisburg
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
72% 71% 67% 64% 68% 68% 70% 72% 72% 68% 71% 74%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Harrisburg weather stats

Harrisburg weather statistics
Hottest month: July 32.2°C 90°F
Driest month: October 74mm 2.9ins
Sunniest month: July 11hrs
Coldest month: January 4.7°C 40.5°F
Wettest month: May 129mm 5.1ins
Warmest sea: August 24°C 75.2°F
Map showing location of Harrisburg (37.73838, -88.54061) Harrisburg map pin © Google

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