Sullivan (IL) monthly weather averages

Contents

Average daytime temperature

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

Sullivan average temperature chart (Celsius) Sullivan average temperature chart (Fahrenheit)
Average monthly temperatures in Sullivan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 0.9 3.7 10.7 18 23.6 28.5 30.3 29.1 26 19.3 11.2 3.6
°F 33.6 38.6 51.2 64.3 74.5 83.3 86.6 84.3 78.8 66.7 52.1 38.5

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.

Sullivan monthly rainfall chart (mm) Sullivan monthly rainfall chart (inches)
Average monthly rainfall in Sullivan (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 52 50 82 97 101 100 105 84 81 71 85 77
inches 2 2 3.2 3.8 4 3.9 4.1 3.3 3.2 2.8 3.3 3
Rainy days 10 9 12 12 10 9 9 8 8 8 10 11

Average annual rainfall in Sullivan: 935.1mm (368.1 inches)

Average daily sunshine

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

Sullivan average daily sunshine chart
Average daily sunshine Sullivan
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.3 5.9 6.6 8 9.6 11 10.9 10 8.7 7.4 4.9 4.4

Day / night temperatures

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

Sullivan average minimum / maximum temperatures (Celsius) Sullivan average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Sullivan (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -8.3 -6.1 0 5.8 11.3 16.2 18.4 17.1 13.3 7.1 1.4 -5.1
Max °C 1.1 3.9 11 18.3 23.9 28.8 30.6 29.4 26.3 19.6 11.4 3.9
Min °F 17.1 21 32.1 42.4 52.3 61.2 65.1 62.7 55.9 44.7 34.5 22.9
Max °F 25.5 30 41.9 53.6 63.7 72.5 76.1 73.8 67.6 55.9 43.5 30.9

Sea temperature

The graph below shows the average sea temperature.

Sullivan average sea temperature chart (Celsius) Sullivan average sea temperature chart (Fahrenheit)
Average sea temperature around Sullivan in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.6 8 8.3 9.5 11.8 15.3 19.6 22.4 20.8 16.2 12.6 10.1
°F 47.5 46.4 46.9 49.1 53.2 59.6 67.2 72.3 69.4 61.2 54.6 50.2

Wind speed

The graph below shows the average wind speed.

Sullivan average winspeed by month (km/h) Sullivan average winspeed by month (mph)
Average wind speed in Sullivan (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 20 19 17 15 13 13 14 16 18 18
mph 12 12 13 12 10 9 8 8 9 10 11 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.

Sullivan relative humidity averages
Average relative humidity in Sullivan
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
74% 73% 70% 65% 66% 67% 71% 73% 72% 69% 74% 77%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Sullivan weather stats

Sullivan weather statistics
Hottest month: July 30.3°C 86.5°F
Driest month: February 50mm 2ins
Sunniest month: July 10.9hrs
Coldest month: January 0.9°C 33.6°F
Wettest month: July 105mm 4.1ins
Warmest sea: August 22.4°C 72.3°F
Map showing location of Sullivan (39.59948, -88.60784) Sullivan map pin © Google

Locations nearby

Top United States locations