30-year climate normals

Karnes County Climate and Weather Averages

Hottest month — August

97.6°

average daily high. The coldest month is January, averaging a low of 39.0°F.

Karnes County gets 31.63" of precipitation a year, and 31% 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	64.8°	39.0°	1.64"
February	69.0°	42.8°	1.61"
March	75.9°	50.5°	2.28"
April	82.0°	56.4°	2.41"
May	88.0°	65.9°	4.38"
June	93.5°	71.4°	2.95"
July	96.1°	73.6°	2.32"
August	97.6°	73.0°	2.66"
September	91.8°	67.8°	4.06"
October	84.4°	58.0°	3.16"
November	73.8°	48.1°	2.32"
December	66.1°	40.9°	1.84"

Rainfall by month

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

January 1.64"

February 1.61"

March 2.28"

April 2.41"

May 4.38"

June 2.95"

July 2.32"

August 2.66"

September 4.06"

October 3.16"

November 2.32"

December 1.84"

Annual total 31.63"

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 3,178

Heating degree days How much heating the climate demands 1,472

Approximate annual cooling cost At 16.44¢/kWh, Texas average $522

Approximate annual electric heating cost Lower where heating is gas rather than electric $85

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 Karnes County, where electricity is one line of eight.

Common questions

What is the weather like in Karnes County?

Karnes County averages a high of 97.6°F in August and a low of 39.0°F in January. Annual precipitation is 31.63 inches, with essentially no snow.

When is the rainy season in Karnes County?

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

How hot does it get in Karnes County?

The average daily high in August, the hottest month, is 97.6°F. That drives 3,178 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Karnes County?

Effectively no. Measurable snowfall is rare in Karnes County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station FLORESVILLE, TX US (USC00413201), 24.3 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.