30-year climate normals

Stanislaus County Climate and Weather Averages

Hottest month — July

95.0°

average daily high. The coldest month is December, averaging a low of 38.6°F.

Stanislaus County gets 12.27" of precipitation a year, and 57% of it falls in Dec, Jan, Feb.

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	56.1°	38.8°	2.57"
February	62.2°	41.8°	2.22"
March	68.1°	45.2°	1.78"
April	73.8°	48.4°	1.00"
May	82.0°	53.7°	0.65"
June	89.7°	59.2°	0.15"
July	95.0°	62.7°	0.00"
August	93.5°	62.0°	0.01"
September	89.1°	58.6°	0.06"
October	79.0°	51.5°	0.55"
November	65.7°	43.2°	1.07"
December	56.2°	38.6°	2.21"

Rainfall by month

Stanislaus County has a distinct wet season. 57% of the year's precipitation arrives in Dec, Jan, Feb.

January 2.57"

February 2.22"

March 1.78"

April 1.00"

May 0.65"

June 0.15"

July 0.00"

August 0.01"

September 0.06"

October 0.55"

November 1.07"

December 2.21"

Annual total 12.27"

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 1,624

Heating degree days How much heating the climate demands 2,300

Approximate annual cooling cost At 33.25¢/kWh, California average $540

Approximate annual electric heating cost Lower where heating is gas rather than electric $268

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 Stanislaus County, where electricity is one line of eight.

Common questions

What is the weather like in Stanislaus County?

Stanislaus County averages a high of 95.0°F in July and a low of 38.6°F in December. Annual precipitation is 12.27 inches, with essentially no snow.

When is the rainy season in Stanislaus County?

The wettest stretch is Dec, Jan, Feb, which accounts for 57% of the year's precipitation. That is a pronounced wet season rather than rain spread evenly through the year.

How hot does it get in Stanislaus County?

The average daily high in July, the hottest month, is 95.0°F. That drives 1,624 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Stanislaus County?

Effectively no. Measurable snowfall is rare in Stanislaus County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MODESTO CITY CO AP, CA US (USW00023258), 5.1 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, California residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.