30-year climate normals

Henderson County Climate and Weather Averages

Hottest month — August

95.1°

average daily high. The coldest month is January, averaging a low of 34.5°F.

Henderson County gets 44.75" of precipitation a year, and 29% of it falls in Oct, Nov, Dec.

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	57.9°	34.5°	3.54"
February	62.0°	38.5°	3.88"
March	69.0°	45.2°	4.08"
April	76.4°	53.1°	3.82"
May	83.2°	62.6°	4.30"
June	90.1°	70.3°	4.09"
July	94.1°	72.6°	2.53"
August	95.1°	72.3°	2.64"
September	89.2°	65.7°	2.97"
October	79.1°	54.6°	5.09"
November	67.6°	44.1°	3.49"
December	59.3°	36.5°	4.32"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Oct, Nov, Dec).

January 3.54"

February 3.88"

March 4.08"

April 3.82"

May 4.30"

June 4.09"

July 2.53"

August 2.64"

September 2.97"

October 5.09"

November 3.49"

December 4.32"

Annual total 44.75"

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 2,529

Heating degree days How much heating the climate demands 2,301

Approximate annual cooling cost At 16.44¢/kWh, Texas average $416

Approximate annual electric heating cost Lower where heating is gas rather than electric $132

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 Henderson County, where electricity is one line of eight.

Common questions

What is the weather like in Henderson County?

Henderson County averages a high of 95.1°F in August and a low of 34.5°F in January. Annual precipitation is 44.75 inches, with essentially no snow.

When is the rainy season in Henderson County?

The wettest stretch is Oct, Nov, Dec, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Henderson County?

The average daily high in August, the hottest month, is 95.1°F. That drives 2,529 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Henderson County?

Effectively no. Measurable snowfall is rare in Henderson County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ATHENS, TX US (USC00410404), 3.6 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, Texas residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.