30-year climate normals

Fayette County Climate and Weather Averages

Hottest month — July

86.7°

average daily high. The coldest month is January, averaging a low of 21.3°F.

Fayette County gets 41.2" of precipitation a year, and 34% 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.

Month	Avg high	Avg low	Precip
January	37.0°	21.3°	2.82"
February	42.1°	25.3°	2.41"
March	52.4°	34.7°	3.17"
April	64.9°	45.4°	4.39"
May	74.7°	55.1°	5.34"
June	83.6°	65.1°	4.13"
July	86.7°	67.0°	3.74"
August	85.5°	64.1°	3.15"
September	80.0°	56.4°	3.38"
October	66.6°	44.9°	2.89"
November	52.8°	35.5°	3.63"
December	41.6°	26.7°	2.15"

Rainfall by month

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

January 2.82"

February 2.41"

March 3.17"

April 4.39"

May 5.34"

June 4.13"

July 3.74"

August 3.15"

September 3.38"

October 2.89"

November 3.63"

December 2.15"

Annual total 41.2"

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 1,274

Heating degree days How much heating the climate demands 5,046

Approximate annual cooling cost At 23.85¢/kWh, Illinois average $304

Approximate annual electric heating cost Lower where heating is gas rather than electric $421

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 Fayette County, where electricity is one line of eight.

Common questions

What is the weather like in Fayette County?

Fayette County averages a high of 86.7°F in July and a low of 21.3°F in January. Annual precipitation is 41.2 inches, with essentially no snow.

When is the rainy season in Fayette County?

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

How hot does it get in Fayette County?

The average daily high in July, the hottest month, is 86.7°F. That drives 1,274 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Fayette County?

Effectively no. Measurable snowfall is rare in Fayette County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BROWNSTOWN 4 SW, IL US (USC00111020), 4.5 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.