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United States › Missouri › Sullivan County › Climate Station CHILLICOTHE 22 ENE, MO US Distance 23.8 mi Normals 1991–2020

30-year climate normals

Sullivan County Climate and Weather Averages

Hottest month — July

85.2°

average daily high. The coldest month is January, averaging a low of 17.8°F.

Sullivan County gets 40.07" 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.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 35.0° 17.8° 1.40"
February 40.3° 22.0° 1.62"
March 52.9° 32.1° 2.80"
April 63.5° 42.4° 3.59"
May 72.5° 52.6° 5.23"
June 81.7° 62.3° 5.09"
July 85.2° 65.6° 4.99"
August 84.3° 63.8° 4.09"
September 77.3° 55.4° 4.19"
October 65.1° 43.5° 3.07"
November 51.4° 32.2° 2.35"
December 39.3° 22.6° 1.65"

Rainfall by month

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

January 1.40"
February 1.62"
March 2.80"
April 3.59"
May 5.23"
June 5.09"
July 4.99"
August 4.09"
September 4.19"
October 3.07"
November 2.35"
December 1.65"
Annual total 40.07"

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 1,053
Heating degree days How much heating the climate demands 5,562
Approximate annual cooling cost At 13.68¢/kWh, Missouri average $144
Approximate annual electric heating cost Lower where heating is gas rather than electric $266

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 Sullivan County, where electricity is one line of eight.

Common questions

What is the weather like in Sullivan County?

Sullivan County averages a high of 85.2°F in July and a low of 17.8°F in January. Annual precipitation is 40.07 inches, with essentially no snow.

When is the rainy season in Sullivan 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 Sullivan County?

The average daily high in July, the hottest month, is 85.2°F. That drives 1,053 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sullivan County?

Effectively no. Measurable snowfall is rare in Sullivan County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station CHILLICOTHE 22 ENE, MO US (USW00013301), 23.8 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.