30-year climate normals

Cooper County Climate and Weather Averages

Hottest month — July

87.7°

average daily high. The coldest month is January, averaging a low of 19.8°F.

Cooper County gets 42.57" of precipitation a year, and 34% of it falls in May, Jun, Jul.

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	37.7°	19.8°	2.11"
February	42.6°	22.9°	2.26"
March	54.6°	33.4°	2.92"
April	65.0°	42.8°	4.21"
May	75.0°	54.6°	5.16"
June	83.6°	64.1°	4.95"
July	87.7°	68.2°	4.49"
August	86.9°	66.2°	4.05"
September	79.5°	56.9°	3.94"
October	67.8°	45.5°	3.63"
November	53.8°	33.7°	2.85"
December	42.8°	25.3°	2.00"

Rainfall by month

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

January 2.11"

February 2.26"

March 2.92"

April 4.21"

May 5.16"

June 4.95"

July 4.49"

August 4.05"

September 3.94"

October 3.63"

November 2.85"

December 2.00"

Annual total 42.57"

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 1,344

Heating degree days How much heating the climate demands 5,095

Approximate annual cooling cost At 13.68¢/kWh, Missouri average $184

Approximate annual electric heating cost Lower where heating is gas rather than electric $244

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 Cooper County, where electricity is one line of eight.

Common questions

What is the weather like in Cooper County?

Cooper County averages a high of 87.7°F in July and a low of 19.8°F in January. Annual precipitation is 42.57 inches, with essentially no snow.

When is the rainy season in Cooper County?

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

How hot does it get in Cooper County?

The average daily high in July, the hottest month, is 87.7°F. That drives 1,344 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Cooper County?

Effectively no. Measurable snowfall is rare in Cooper County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BOONVILLE, MO US (USC00230824), 8.8 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, Missouri residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.