30-year climate normals

Tom Green County Climate and Weather Averages

Hottest month — July

97.4°

average daily high. The coldest month is January, averaging a low of 33.7°F.

Tom Green County gets 20.93" of precipitation a year, and 35% of it falls in Aug, Sep, Oct.

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	61.1°	33.7°	0.92"
February	65.4°	37.6°	1.20"
March	73.1°	45.6°	1.48"
April	81.7°	52.5°	1.47"
May	88.7°	62.3°	3.05"
June	94.4°	70.0°	2.31"
July	97.4°	72.3°	1.10"
August	96.7°	71.6°	2.42"
September	89.4°	64.6°	2.51"
October	80.5°	53.8°	2.42"
November	69.2°	42.6°	1.16"
December	62.0°	34.9°	0.89"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 35% falling in the wettest three months (Aug, Sep, Oct).

January 0.92"

February 1.20"

March 1.48"

April 1.47"

May 3.05"

June 2.31"

July 1.10"

August 2.42"

September 2.51"

October 2.42"

November 1.16"

December 0.89"

Annual total 20.93"

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 2,786

Heating degree days How much heating the climate demands 2,130

Approximate annual cooling cost At 16.44¢/kWh, Texas average $458

Approximate annual electric heating cost Lower where heating is gas rather than electric $123

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 Tom Green County, where electricity is one line of eight.

Common questions

What is the weather like in Tom Green County?

Tom Green County averages a high of 97.4°F in July and a low of 33.7°F in January. Annual precipitation is 20.93 inches, with essentially no snow.

When is the rainy season in Tom Green County?

The wettest stretch is Aug, Sep, Oct, which accounts for 35% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Tom Green County?

The average daily high in July, the hottest month, is 97.4°F. That drives 2,786 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Tom Green County?

Effectively no. Measurable snowfall is rare in Tom Green County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SAN ANGELO, TX US (USW00023034), 2.5 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.