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United States › Illinois › Jersey County › Climate Station JERSEYVILLE 2 SW, IL US Distance 1.8 mi Normals 1991–2020

30-year climate normals

Jersey County Climate and Weather Averages

Hottest month — July

86.5°

average daily high. The coldest month is January, averaging a low of 19.2°F.

Jersey County gets 42.22" of precipitation a year and 12.5" of snow, and 33% 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 PrecipSnow
January 36.3° 19.2° 2.45" 4.3"
February 41.5° 22.8° 2.31" 3.7"
March 52.5° 31.8° 3.17" 1.6"
April 64.8° 42.1° 4.55" 0.0"
May 74.3° 53.8° 5.29" 0.0"
June 82.9° 62.8° 4.12" 0.0"
July 86.5° 66.0° 3.56" 0.0"
August 85.2° 63.3° 3.72" 0.0"
September 79.2° 54.7° 3.44" 0.0"
October 67.2° 43.3° 3.29" 0.0"
November 52.8° 33.0° 3.67" 0.7"
December 41.2° 24.2° 2.65" 2.2"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 33% falling in the wettest three months (Apr, May, Jun).

January 2.45"
February 2.31"
March 3.17"
April 4.55"
May 5.29"
June 4.12"
July 3.56"
August 3.72"
September 3.44"
October 3.29"
November 3.67"
December 2.65"
Annual total 42.22"

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 1,152
Heating degree days How much heating the climate demands 5,347
Approximate annual cooling cost At 23.85¢/kWh, Illinois average $275
Approximate annual electric heating cost Lower where heating is gas rather than electric $446

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 Jersey County, where electricity is one line of eight.

Common questions

What is the weather like in Jersey County?

Jersey County averages a high of 86.5°F in July and a low of 19.2°F in January. Annual precipitation is 42.22 inches, including 12.5 inches of snow.

When is the rainy season in Jersey County?

The wettest stretch is Apr, May, Jun, which accounts for 33% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Jersey County?

The average daily high in July, the hottest month, is 86.5°F. That drives 1,152 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Jersey County?

Yes. Jersey County averages 12.5 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station JERSEYVILLE 2 SW, IL US (USC00114489), 1.8 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.