30-year climate normals

Knox County Climate and Weather Averages

Hottest month — July

85.8°

average daily high. The coldest month is January, averaging a low of 17.2°F.

Knox County gets 39.27" of precipitation a year, and 37% 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	34.4°	17.2°	1.60"
February	39.5°	20.6°	1.77"
March	51.8°	30.6°	2.62"
April	63.3°	41.0°	3.93"
May	72.4°	51.7°	5.02"
June	81.9°	61.3°	5.07"
July	85.8°	65.0°	4.35"
August	84.4°	62.8°	3.94"
September	77.1°	53.9°	3.65"
October	64.5°	43.2°	3.24"
November	50.9°	31.2°	2.41"
December	39.1°	22.1°	1.67"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 37% falling in the wettest three months (May, Jun, Jul).

January 1.60"

February 1.77"

March 2.62"

April 3.93"

May 5.02"

June 5.07"

July 4.35"

August 3.94"

September 3.65"

October 3.24"

November 2.41"

December 1.67"

Annual total 39.27"

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 1,009

Heating degree days How much heating the climate demands 5,746

Approximate annual cooling cost At 13.68¢/kWh, Missouri average $138

Approximate annual electric heating cost Lower where heating is gas rather than electric $275

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 Knox County, where electricity is one line of eight.

Common questions

What is the weather like in Knox County?

Knox County averages a high of 85.8°F in July and a low of 17.2°F in January. Annual precipitation is 39.27 inches, with essentially no snow.

When is the rainy season in Knox County?

The wettest stretch is May, Jun, Jul, which accounts for 37% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Knox County?

The average daily high in July, the hottest month, is 85.8°F. That drives 1,009 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Knox County?

Effectively no. Measurable snowfall is rare in Knox County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station KIRKSVILLE RGNL AP, MO US (USW00014938), 21.1 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.