30-year climate normals

Washington County Climate and Weather Averages

Hottest month — August

95.0°

average daily high. The coldest month is January, averaging a low of 39.6°F.

Washington County gets 48.03" of precipitation a year, and 29% of it falls in Sep, Oct, Nov.

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	60.8°	39.6°	3.66"
February	64.4°	43.0°	3.36"
March	71.0°	49.2°	3.63"
April	78.1°	56.6°	3.56"
May	84.8°	65.0°	5.39"
June	90.9°	71.6°	4.46"
July	93.7°	73.8°	2.58"
August	95.0°	73.7°	3.83"
September	89.8°	68.4°	4.59"
October	81.4°	58.5°	5.07"
November	70.1°	48.2°	4.21"
December	62.5°	41.3°	3.69"

Rainfall by month

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

January 3.66"

February 3.36"

March 3.63"

April 3.56"

May 5.39"

June 4.46"

July 2.58"

August 3.83"

September 4.59"

October 5.07"

November 4.21"

December 3.69"

Annual total 48.03"

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 2,852

Heating degree days How much heating the climate demands 1,738

Approximate annual cooling cost At 16.44¢/kWh, Texas average $469

Approximate annual electric heating cost Lower where heating is gas rather than electric $100

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 Washington County, where electricity is one line of eight.

Common questions

What is the weather like in Washington County?

Washington County averages a high of 95.0°F in August and a low of 39.6°F in January. Annual precipitation is 48.03 inches, with essentially no snow.

When is the rainy season in Washington County?

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

How hot does it get in Washington County?

The average daily high in August, the hottest month, is 95.0°F. That drives 2,852 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Washington County?

Effectively no. Measurable snowfall is rare in Washington County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station BRENHAM, TX US (USC00411048), 3.9 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.