Hillsboro (IL) monthly weather averages

Average daytime temperature

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

Hillsboro average temperature chart (Celsius) Hillsboro average temperature chart (Fahrenheit)
Average monthly temperatures in Hillsboro (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 2.3 5.1 11.9 19 24.2 29.1 31.1 29.8 26.4 20.1 12.1 4.8
°F 36.1 41.3 53.4 66.2 75.6 84.5 88.1 85.6 79.5 68.2 53.9 40.6

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.

Hillsboro monthly rainfall chart (mm) Hillsboro monthly rainfall chart (inches)
Average monthly rainfall in Hillsboro (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 49 51 89 99 111 101 97 81 86 72 88 83
inches 1.9 2 3.5 3.9 4.4 4 3.8 3.2 3.4 2.8 3.4 3.3
Rainy days 9 9 12 11 10 9 9 8 8 8 10 10

Average annual rainfall in Hillsboro: 954.966mm (376 inches)

Average daily sunshine

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

Hillsboro average daily sunshine chart
Average daily sunshine Hillsboro
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 5.6 6 6.7 8.1 9.5 10.8 10.9 9.9 8.8 7.5 5.1 4.6

Day / night temperatures

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

Hillsboro average minimum / maximum temperatures (Celsius) Hillsboro average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Hillsboro (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -7.7 -5.4 0.5 6.5 11.7 16.6 18.8 17.1 13.3 7.2 1.6 -4.6
Max °C 2.5 5.4 12.2 19.3 24.6 29.5 31.5 30.1 26.7 20.5 12.4 5
Min °F 18.1 22.3 32.8 43.7 53 61.8 65.8 62.8 55.9 44.9 34.9 23.7
Max °F 27.3 32 43.3 55.2 64.6 73.4 77.2 74.5 68 56.8 44.6 32.4

Sea temperature

The graph below shows the average sea temperature.

Hillsboro average sea temperature chart (Celsius) Hillsboro average sea temperature chart (Fahrenheit)
Average sea temperature around Hillsboro in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9 8.6 8.9 10.2 12.3 15.1 18.8 22 20.5 16.1 12.7 10.5
°F 48.3 47.4 48.1 50.3 54.1 59.3 65.8 71.6 68.8 60.9 54.8 50.8

Wind speed

The graph below shows the average wind speed.

Hillsboro average winspeed by month (km/h) Hillsboro average winspeed by month (mph)
Average wind speed in Hillsboro (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 21 20 17 15 13 13 14 16 18 19
mph 12 12 13 12 10 9 8 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.

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

Other monthly averages

UV index Best time to go?

Hillsboro weather stats

Hillsboro weather statistics
Hottest month: July 31.1°C 88°F
Driest month: January 49mm 1.9ins
Sunniest month: July 10.9hrs
Coldest month: January 2.3°C 36.1°F
Wettest month: May 111mm 4.4ins
Warmest sea: August 22°C 71.6°F
Map showing location of Hillsboro (39.16116, -89.4937) Hillsboro map pin © Google

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