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United States › Illinois › Champaign County › Climate Station CHAMPAIGN WILLARD AP, IL US Distance 8.1 mi Normals 1991–2020

30-year climate normals

Champaign County Climate and Weather Averages

Hottest month — July

85.0°

average daily high. The coldest month is January, averaging a low of 17.9°F.

Champaign County gets 36.97" of precipitation a year, and 34% of it falls in May, Jun, Jul.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 34.1° 17.9° 2.07"
February 38.9° 21.7° 1.80"
March 51.5° 31.1° 2.57"
April 64.7° 40.9° 3.68"
May 75.5° 52.4° 4.39"
June 83.5° 61.7° 4.35"
July 85.0° 64.4° 3.87"
August 83.5° 62.1° 3.12"
September 79.4° 54.5° 3.05"
October 66.9° 43.1° 3.03"
November 51.5° 32.2° 2.90"
December 39.1° 23.6° 2.14"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 34% falling in the wettest three months (May, Jun, Jul).

January 2.07"
February 1.80"
March 2.57"
April 3.68"
May 4.39"
June 4.35"
July 3.87"
August 3.12"
September 3.05"
October 3.03"
November 2.90"
December 2.14"
Annual total 36.97"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 1,054
Heating degree days How much heating the climate demands 5,586
Approximate annual cooling cost At 23.85¢/kWh, Illinois average $251
Approximate annual electric heating cost Lower where heating is gas rather than electric $466

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Champaign County, where electricity is one line of eight.

Common questions

What is the weather like in Champaign County?

Champaign County averages a high of 85.0°F in July and a low of 17.9°F in January. Annual precipitation is 36.97 inches, with essentially no snow.

When is the rainy season in Champaign County?

The wettest stretch is May, Jun, Jul, which accounts for 34% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Champaign County?

The average daily high in July, the hottest month, is 85.0°F. That drives 1,054 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Champaign County?

Effectively no. Measurable snowfall is rare in Champaign County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CHAMPAIGN WILLARD AP, IL US (USW00094870), 8.1 miles from the county centroid.
  • Heating and cooling degree days — NOAA, same station and period.
  • Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Illinois residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.