30-year climate normals

Delta County Climate and Weather Averages

Hottest month — August

94.1°

average daily high. The coldest month is January, averaging a low of 33.6°F.

Delta County gets 49.25" of precipitation a year, and 31% 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	54.4°	33.6°	3.32"
February	58.7°	37.8°	3.45"
March	66.4°	44.3°	4.31"
April	74.6°	52.5°	4.16"
May	81.7°	62.1°	4.91"
June	89.5°	70.3°	4.17"
July	93.8°	73.7°	3.42"
August	94.1°	72.5°	3.04"
September	88.1°	65.1°	3.25"
October	78.0°	54.2°	5.75"
November	66.2°	43.9°	5.01"
December	56.7°	36.9°	4.46"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 31% falling in the wettest three months (Oct, Nov, Dec).

January 3.32"

February 3.45"

March 4.31"

April 4.16"

May 4.91"

June 4.17"

July 3.42"

August 3.04"

September 3.25"

October 5.75"

November 5.01"

December 4.46"

Annual total 49.25"

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 2,425

Heating degree days How much heating the climate demands 2,558

Approximate annual cooling cost At 16.44¢/kWh, Texas average $399

Approximate annual electric heating cost Lower where heating is gas rather than electric $147

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 Delta County, where electricity is one line of eight.

Common questions

What is the weather like in Delta County?

Delta County averages a high of 94.1°F in August and a low of 33.6°F in January. Annual precipitation is 49.25 inches, with essentially no snow.

When is the rainy season in Delta County?

The wettest stretch is Oct, Nov, Dec, which accounts for 31% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Delta County?

The average daily high in August, the hottest month, is 94.1°F. That drives 2,425 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Delta County?

Effectively no. Measurable snowfall is rare in Delta County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station COOPER DAM, TX US (USC00411968), 6.1 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.