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United States › Tennessee › Grainger County › Climate Station MORRISTOWN WFO, TN US Distance 9.6 mi Normals 1991–2020

30-year climate normals

Grainger County Climate and Weather Averages

Hottest month — July

85.5°

average daily high. The coldest month is January, averaging a low of 29.0°F.

Grainger County gets 47.39" of precipitation a year and 10.2" of snow, and 28% of it falls in Feb, Mar, Apr.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 45.9° 29.0° 4.40" 3.5"
February 50.4° 32.4° 4.47" 3.3"
March 59.1° 39.7° 4.43" 1.2"
April 68.9° 48.0° 4.49" 0.0"
May 76.3° 56.4° 3.58" 0.0"
June 82.6° 64.4° 4.28" 0.0"
July 85.5° 67.6° 4.98" 0.0"
August 85.1° 66.8° 2.97" 0.0"
September 80.0° 60.8° 3.12" 0.0"
October 69.6° 49.5° 2.70" 0.0"
November 57.9° 38.9° 3.57" 0.3"
December 48.8° 32.6° 4.40" 1.9"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 28% falling in the wettest three months (Feb, Mar, Apr).

January 4.40"
February 4.47"
March 4.43"
April 4.49"
May 3.58"
June 4.28"
July 4.98"
August 2.97"
September 3.12"
October 2.70"
November 3.57"
December 4.40"
Annual total 47.39"

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 1,314
Heating degree days How much heating the climate demands 3,773
Approximate annual cooling cost At 14.47¢/kWh, Tennessee average $190
Approximate annual electric heating cost Lower where heating is gas rather than electric $191

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 Grainger County, where electricity is one line of eight.

Common questions

What is the weather like in Grainger County?

Grainger County averages a high of 85.5°F in July and a low of 29.0°F in January. Annual precipitation is 47.39 inches, including 10.2 inches of snow.

When is the rainy season in Grainger County?

The wettest stretch is Feb, Mar, Apr, which accounts for 28% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Grainger County?

The average daily high in July, the hottest month, is 85.5°F. That drives 1,314 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Grainger County?

Yes. Grainger County averages 10.2 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MORRISTOWN WFO, TN US (USC00406272), 9.6 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, Tennessee residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.