30-year climate normals

Siskiyou County Climate and Weather Averages

Hottest month — July

93.4°

average daily high. The coldest month is December, averaging a low of 25.9°F.

Siskiyou County gets 11.99" of precipitation a year, and 42% 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	47.2°	26.2°	1.43"
February	52.5°	27.1°	1.41"
March	58.2°	30.6°	1.25"
April	63.7°	34.1°	1.07"
May	73.7°	40.7°	1.05"
June	82.8°	47.0°	0.56"
July	93.4°	54.5°	0.16"
August	92.2°	52.6°	0.34"
September	84.4°	45.4°	0.27"
October	69.6°	36.0°	0.86"
November	54.2°	29.6°	1.34"
December	45.7°	25.9°	2.25"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 42% falling in the wettest three months (Dec, Jan, Feb).

January 1.43"

February 1.41"

March 1.25"

April 1.07"

May 1.05"

June 0.56"

July 0.16"

August 0.34"

September 0.27"

October 0.86"

November 1.34"

December 2.25"

Annual total 11.99"

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 704

Heating degree days How much heating the climate demands 5,127

Approximate annual cooling cost At 33.25¢/kWh, California average $234

Approximate annual electric heating cost Lower where heating is gas rather than electric $597

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 Siskiyou County, where electricity is one line of eight.

Common questions

What is the weather like in Siskiyou County?

Siskiyou County averages a high of 93.4°F in July and a low of 25.9°F in December. Annual precipitation is 11.99 inches, with essentially no snow.

When is the rainy season in Siskiyou County?

The wettest stretch is Dec, Jan, Feb, which accounts for 42% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Siskiyou County?

The average daily high in July, the hottest month, is 93.4°F. That drives 704 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Siskiyou County?

Effectively no. Measurable snowfall is rare in Siskiyou County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MONTAGUE SISKIYOU CO AP, CA US (USW00024259), 13.7 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.