30-year climate normals

Lake County Climate and Weather Averages

Hottest month — July

94.0°

average daily high. The coldest month is December, averaging a low of 36.0°F.

Lake County gets 34.84" 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	58.3°	37.2°	6.70"
February	61.0°	38.8°	6.27"
March	64.8°	40.7°	5.32"
April	69.0°	42.9°	2.55"
May	77.7°	47.8°	1.18"
June	85.5°	52.4°	0.34"
July	94.0°	56.1°	0.01"
August	93.5°	54.8°	0.07"
September	88.9°	50.7°	0.16"
October	79.0°	45.1°	1.78"
November	64.6°	39.9°	3.54"
December	56.6°	36.0°	6.92"

Rainfall by month

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

January 6.70"

February 6.27"

March 5.32"

April 2.55"

May 1.18"

June 0.34"

July 0.01"

August 0.07"

September 0.16"

October 1.78"

November 3.54"

December 6.92"

Annual total 34.84"

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 1,005

Heating degree days How much heating the climate demands 2,879

Approximate annual cooling cost At 33.25¢/kWh, California average $334

Approximate annual electric heating cost Lower where heating is gas rather than electric $335

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 Lake County, where electricity is one line of eight.

Common questions

What is the weather like in Lake County?

Lake County averages a high of 94.0°F in July and a low of 36.0°F in December. Annual precipitation is 34.84 inches, with essentially no snow.

When is the rainy season in Lake 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 Lake County?

The average daily high in July, the hottest month, is 94.0°F. That drives 1,005 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Lake County?

Effectively no. Measurable snowfall is rare in Lake County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station UKIAH MUNI AP, CA US (USW00023275), 24.5 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.