30-year climate normals

Pettis County Climate and Weather Averages

Hottest month — July

87.3°

average daily high. The coldest month is January, averaging a low of 21.2°F.

Pettis County gets 36.2" of precipitation a year, and 38% 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	38.6°	21.2°	1.53"
February	43.8°	25.2°	1.68"
March	55.2°	34.5°	2.49"
April	65.4°	44.0°	3.78"
May	74.4°	54.2°	4.68"
June	83.2°	63.5°	4.46"
July	87.3°	67.4°	4.52"
August	86.5°	65.3°	2.84"
September	78.7°	56.9°	3.01"
October	67.1°	45.7°	3.09"
November	53.8°	34.9°	2.45"
December	42.8°	25.7°	1.67"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 38% falling in the wettest three months (May, Jun, Jul).

January 1.53"

February 1.68"

March 2.49"

April 3.78"

May 4.68"

June 4.46"

July 4.52"

August 2.84"

September 3.01"

October 3.09"

November 2.45"

December 1.67"

Annual total 36.2"

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 1,266

Heating degree days How much heating the climate demands 4,948

Approximate annual cooling cost At 13.68¢/kWh, Missouri average $173

Approximate annual electric heating cost Lower where heating is gas rather than electric $237

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 Pettis County, where electricity is one line of eight.

Common questions

What is the weather like in Pettis County?

Pettis County averages a high of 87.3°F in July and a low of 21.2°F in January. Annual precipitation is 36.2 inches, with essentially no snow.

When is the rainy season in Pettis County?

The wettest stretch is May, Jun, Jul, which accounts for 38% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Pettis County?

The average daily high in July, the hottest month, is 87.3°F. That drives 1,266 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Pettis County?

Effectively no. Measurable snowfall is rare in Pettis County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SEDALIA MEM AP, MO US (USW00003994), 5.7 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.