30-year climate normals

Grundy County Climate and Weather Averages

Hottest month — July

83.2°

average daily high. The coldest month is January, averaging a low of 25.6°F.

Grundy County gets 63.18" of precipitation a year, 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.

Month	Avg high	Avg low	Precip
January	45.3°	25.6°	5.76"
February	48.7°	28.1°	5.54"
March	57.4°	34.5°	6.13"
April	66.4°	42.4°	6.15"
May	73.5°	51.7°	5.08"
June	80.0°	59.7°	5.26"
July	83.2°	63.2°	6.09"
August	82.8°	61.6°	4.27"
September	78.1°	55.1°	4.24"
October	68.3°	43.3°	3.45"
November	57.4°	34.2°	4.83"
December	48.1°	28.7°	6.38"

Rainfall by month

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

January 5.76"

February 5.54"

March 6.13"

April 6.15"

May 5.08"

June 5.26"

July 6.09"

August 4.27"

September 4.24"

October 3.45"

November 4.83"

December 6.38"

Annual total 63.18"

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 818

Heating degree days How much heating the climate demands 4,477

Approximate annual cooling cost At 14.47¢/kWh, Tennessee average $118

Approximate annual electric heating cost Lower where heating is gas rather than electric $227

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 Grundy County, where electricity is one line of eight.

Common questions

What is the weather like in Grundy County?

Grundy County averages a high of 83.2°F in July and a low of 25.6°F in January. Annual precipitation is 63.18 inches, with essentially no snow.

When is the rainy season in Grundy 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 Grundy County?

The average daily high in July, the hottest month, is 83.2°F. That drives 818 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Grundy County?

Effectively no. Measurable snowfall is rare in Grundy County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station COALMONT, TN US (USC00401887), 1.8 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, Tennessee residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.