30-year climate normals

Sumter County Climate and Weather Averages

Hottest month — August

91.7°

average daily high. The coldest month is January, averaging a low of 48.9°F.

Sumter County gets 43.78" of precipitation a year, and 45% of it falls in Jun, Jul, Aug.

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	69.9°	48.9°	2.51"
February	73.3°	52.0°	2.08"
March	77.3°	56.0°	3.22"
April	82.7°	61.7°	2.04"
May	88.1°	67.7°	2.68"
June	90.7°	73.1°	6.98"
July	91.1°	74.9°	5.88"
August	91.7°	75.0°	6.63"
September	89.7°	73.1°	5.21"
October	84.5°	66.1°	2.62"
November	77.3°	57.1°	1.76"
December	72.4°	52.0°	2.17"

Rainfall by month

Sumter County has a distinct wet season. 45% of the year's precipitation arrives in Jun, Jul, Aug.

January 2.51"

February 2.08"

March 3.22"

April 2.04"

May 2.68"

June 6.98"

July 5.88"

August 6.63"

September 5.21"

October 2.62"

November 1.76"

December 2.17"

Annual total 43.78"

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 3,481

Heating degree days How much heating the climate demands 630

Approximate annual cooling cost At 15.17¢/kWh, Florida average $528

Approximate annual electric heating cost Lower where heating is gas rather than electric $33

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 Sumter County, where electricity is one line of eight.

Common questions

What is the weather like in Sumter County?

Sumter County averages a high of 91.7°F in August and a low of 48.9°F in January. Annual precipitation is 43.78 inches, with essentially no snow.

When is the rainy season in Sumter County?

The wettest stretch is Jun, Jul, Aug, which accounts for 45% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Sumter County?

The average daily high in August, the hottest month, is 91.7°F. That drives 3,481 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sumter County?

Effectively no. Measurable snowfall is rare in Sumter County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station LEESBURG MUNI AP, FL US (USW00012819), 17.4 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, Florida residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.