30-year climate normals

Saline County Climate and Weather Averages

Hottest month — July

89.1°

average daily high. The coldest month is January, averaging a low of 24.0°F.

Saline County gets 47.59" of precipitation a year, and 30% 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	42.9°	24.0°	3.79"
February	47.7°	28.3°	3.13"
March	58.1°	36.1°	4.90"
April	69.4°	45.7°	5.26"
May	78.2°	56.5°	4.31"
June	86.0°	65.1°	4.92"
July	89.1°	68.4°	3.49"
August	88.2°	65.6°	3.58"
September	82.4°	57.3°	3.10"
October	71.2°	45.4°	3.76"
November	57.4°	36.3°	3.97"
December	46.8°	28.9°	3.38"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 30% falling in the wettest three months (Apr, May, Jun).

January 3.79"

February 3.13"

March 4.90"

April 5.26"

May 4.31"

June 4.92"

July 3.49"

August 3.58"

September 3.10"

October 3.76"

November 3.97"

December 3.38"

Annual total 47.59"

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 1,522

Heating degree days How much heating the climate demands 4,299

Approximate annual cooling cost At 23.85¢/kWh, Illinois average $363

Approximate annual electric heating cost Lower where heating is gas rather than electric $359

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 Saline County, where electricity is one line of eight.

Common questions

What is the weather like in Saline County?

Saline County averages a high of 89.1°F in July and a low of 24.0°F in January. Annual precipitation is 47.59 inches, with essentially no snow.

When is the rainy season in Saline County?

The wettest stretch is Apr, May, Jun, which accounts for 30% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Saline County?

The average daily high in July, the hottest month, is 89.1°F. That drives 1,522 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Saline County?

Effectively no. Measurable snowfall is rare in Saline County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station HARRISBURG, IL US (USC00113879), 1.3 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.