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United States › Illinois › Adams County › Climate Station QUINCY RGNL AP, IL US Distance 3.4 mi Normals 1991–2020

30-year climate normals

Adams County Climate and Weather Averages

Hottest month — July

86.0°

average daily high. The coldest month is January, averaging a low of 18.6°F.

Adams County gets 36.43" of precipitation a year, and 36% of it falls in Apr, May, Jun.

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 34.6° 18.6° 1.57"
February 39.7° 22.7° 1.77"
March 51.7° 32.4° 2.29"
April 63.7° 42.8° 3.98"
May 73.3° 53.9° 4.55"
June 82.4° 63.1° 4.50"
July 86.0° 66.5° 3.49"
August 84.5° 64.5° 3.93"
September 77.9° 56.1° 3.09"
October 65.3° 44.8° 3.05"
November 51.2° 33.4° 2.41"
December 39.3° 23.9° 1.80"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 36% falling in the wettest three months (Apr, May, Jun).

January 1.57"
February 1.77"
March 2.29"
April 3.98"
May 4.55"
June 4.50"
July 3.49"
August 3.93"
September 3.09"
October 3.05"
November 2.41"
December 1.80"
Annual total 36.43"

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 1,153
Heating degree days How much heating the climate demands 5,486
Approximate annual cooling cost At 23.85¢/kWh, Illinois average $275
Approximate annual electric heating cost Lower where heating is gas rather than electric $458

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 Adams County, where electricity is one line of eight.

Common questions

What is the weather like in Adams County?

Adams County averages a high of 86.0°F in July and a low of 18.6°F in January. Annual precipitation is 36.43 inches, with essentially no snow.

When is the rainy season in Adams County?

The wettest stretch is Apr, May, Jun, which accounts for 36% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Adams County?

The average daily high in July, the hottest month, is 86.0°F. That drives 1,153 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Adams County?

Effectively no. Measurable snowfall is rare in Adams County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station QUINCY RGNL AP, IL US (USW00093989), 3.4 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.