30-year climate normals

Alexander County Climate and Weather Averages

Hottest month — July

89.2°

average daily high. The coldest month is January, averaging a low of 26.2°F.

Alexander County gets 47.91" of precipitation a year, and 32% of it falls in Mar, Apr, May.

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	43.0°	26.2°	3.51"
February	48.2°	29.7°	3.31"
March	58.1°	37.3°	4.69"
April	69.0°	46.8°	5.18"
May	78.1°	57.5°	5.27"
June	86.6°	65.9°	3.80"
July	89.2°	69.3°	3.87"
August	88.3°	66.4°	3.23"
September	81.8°	57.7°	3.61"
October	70.9°	46.3°	3.57"
November	56.8°	36.7°	4.25"
December	46.3°	29.8°	3.62"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (Mar, Apr, May).

January 3.51"

February 3.31"

March 4.69"

April 5.18"

May 5.27"

June 3.80"

July 3.87"

August 3.23"

September 3.61"

October 3.57"

November 4.25"

December 3.62"

Annual total 47.91"

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 1,566

Heating degree days How much heating the climate demands 4,177

Approximate annual cooling cost At 23.85¢/kWh, Illinois average $373

Approximate annual electric heating cost Lower where heating is gas rather than electric $349

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 Alexander County, where electricity is one line of eight.

Common questions

What is the weather like in Alexander County?

Alexander County averages a high of 89.2°F in July and a low of 26.2°F in January. Annual precipitation is 47.91 inches, with essentially no snow.

When is the rainy season in Alexander County?

The wettest stretch is Mar, Apr, May, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Alexander County?

The average daily high in July, the hottest month, is 89.2°F. That drives 1,566 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Alexander County?

Effectively no. Measurable snowfall is rare in Alexander County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CAPE GIRARDEAU MUNI AP, MO US (USW00003935), 12.5 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.