Pontiac (IL) monthly weather averages

Average daytime temperature

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

Pontiac average temperature chart (Celsius) Pontiac average temperature chart (Fahrenheit)
Average monthly temperatures in Pontiac (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -1.5 1.2 8.2 16.1 22.5 27.8 29.3 28 24.7 18.1 9.4 1.4
°F 29.2 34.1 46.8 60.9 72.5 82 84.8 82.3 76.5 64.6 48.8 34.5

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.

Pontiac monthly rainfall chart (mm) Pontiac monthly rainfall chart (inches)
Average monthly rainfall in Pontiac (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 39 34 65 93 95 100 106 81 85 63 67 59
inches 1.6 1.4 2.6 3.7 3.7 3.9 4.2 3.2 3.4 2.5 2.6 2.3
Rainy days 10 9 12 12 11 10 9 9 9 9 10 11

Average annual rainfall in Pontiac: 839.834mm (330.6 inches)

Average daily sunshine

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

Pontiac average daily sunshine chart
Average daily sunshine Pontiac
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.1 5.7 6.5 7.8 9.6 11 10.9 9.8 8.4 7.1 4.5 4.1

Day / night temperatures

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

Pontiac average minimum / maximum temperatures (Celsius) Pontiac average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Pontiac (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -10.9 -8.8 -2.1 4.3 10 15.5 17.6 16.4 12.2 5.6 -0.6 -7.2
Max °C -1.3 1.4 8.5 16.4 22.8 28.1 29.6 28.3 25.1 18.4 9.6 1.6
Min °F 12.4 16.2 28.3 39.7 50 59.9 63.7 61.4 53.9 42.1 30.9 19
Max °F 21 25.3 37.8 50.5 61.5 71.2 74.5 72.1 65.5 53.6 40.1 27

Sea temperature

The graph below shows the average sea temperature.

Pontiac average sea temperature chart (Celsius) Pontiac average sea temperature chart (Fahrenheit)
Average sea temperature around Pontiac in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.4 6.8 6.9 8 10.2 13.9 18.6 21.7 20 15.2 11.4 8.8
°F 45.2 44.2 44.5 46.4 50.3 57.1 65.5 71 68 59.4 52.5 47.9

Wind speed

The graph below shows the average wind speed.

Pontiac average winspeed by month (km/h) Pontiac average winspeed by month (mph)
Average wind speed in Pontiac (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 21 21 17 16 14 13 14 17 18 19
mph 12 12 13 13 11 10 9 8 9 10 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.

Pontiac relative humidity averages
Average relative humidity in Pontiac
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
74% 74% 71% 65% 65% 66% 71% 73% 72% 70% 74% 78%

Other monthly averages

UV index Best time to go?

Pontiac weather stats

Pontiac weather statistics
Hottest month: July 29.3°C 84.7°F
Driest month: February 34mm 1.3ins
Sunniest month: July 10.9hrs
Coldest month: January -1.5°C 29.3°F
Wettest month: July 106mm 4.2ins
Warmest sea: August 21.7°C 71.1°F
Map showing location of Pontiac (40.88087, -88.62978) Pontiac map pin © Google

Locations nearby

Top United States locations