30-year climate normals

St. Clair County Climate and Weather Averages

Hottest month — July

90.0°

average daily high. The coldest month is January, averaging a low of 32.9°F.

St. Clair County gets 52.23" of precipitation a year, and 30% of it falls in Jan, Feb, Mar.

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	54.1°	32.9°	4.89"
February	59.2°	35.8°	5.13"
March	66.4°	42.8°	5.71"
April	74.6°	48.6°	4.41"
May	81.1°	57.6°	3.34"
June	87.5°	66.5°	4.09"
July	90.0°	70.0°	4.53"
August	89.6°	68.7°	3.64"
September	85.1°	62.5°	3.53"
October	75.8°	50.3°	3.06"
November	64.3°	39.0°	4.86"
December	56.8°	35.2°	5.04"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 30% falling in the wettest three months (Jan, Feb, Mar).

January 4.89"

February 5.13"

March 5.71"

April 4.41"

May 3.34"

June 4.09"

July 4.53"

August 3.64"

September 3.53"

October 3.06"

November 4.86"

December 5.04"

Annual total 52.23"

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 1,840

Heating degree days How much heating the climate demands 2,808

Approximate annual cooling cost At 16.77¢/kWh, Alabama average $309

Approximate annual electric heating cost Lower where heating is gas rather than electric $165

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 St. Clair County, where electricity is one line of eight.

Common questions

What is the weather like in St. Clair County?

St. Clair County averages a high of 90.0°F in July and a low of 32.9°F in January. Annual precipitation is 52.23 inches, with essentially no snow.

When is the rainy season in St. Clair County?

The wettest stretch is Jan, Feb, Mar, which accounts for 30% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in St. Clair County?

The average daily high in July, the hottest month, is 90.0°F. That drives 1,840 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in St. Clair County?

Effectively no. Measurable snowfall is rare in St. Clair County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station TALLADEGA 10 NNE, AL US (USW00073803), 17.8 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, Alabama residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.