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United States › California › Humboldt County › Climate Station EUREKA WFO WOODLEY ISLAND, CA US Distance 14.2 mi Normals 1991–2020

30-year climate normals

Humboldt County Climate and Weather Averages

Hottest month — August

64.0°

average daily high. The coldest month is December, averaging a low of 40.0°F.

Humboldt County gets 40.4" of precipitation a year, and 51% 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.

40° 60° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 55.1° 40.8° 6.67"
February 55.4° 41.3° 5.64"
March 56.1° 42.4° 5.75"
April 57.4° 44.2° 3.64"
May 59.6° 47.7° 1.66"
June 61.9° 50.1° 0.70"
July 63.1° 52.4° 0.18"
August 64.0° 53.0° 0.18"
September 63.9° 50.5° 0.68"
October 61.9° 46.8° 2.31"
November 57.8° 43.2° 4.89"
December 54.7° 40.0° 8.10"

Rainfall by month

Humboldt County has a distinct wet season. 51% of the year's precipitation arrives in Dec, Jan, Feb.

January 6.67"
February 5.64"
March 5.75"
April 3.64"
May 1.66"
June 0.70"
July 0.18"
August 0.18"
September 0.68"
October 2.31"
November 4.89"
December 8.10"
Annual total 40.4"

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 2
Heating degree days How much heating the climate demands 4,506
Approximate annual cooling cost At 33.25¢/kWh, California average $1
Approximate annual electric heating cost Lower where heating is gas rather than electric $524

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 Humboldt County, where electricity is one line of eight.

Common questions

What is the weather like in Humboldt County?

Humboldt County averages a high of 64.0°F in August and a low of 40.0°F in December. Annual precipitation is 40.4 inches, with essentially no snow.

When is the rainy season in Humboldt County?

The wettest stretch is Dec, Jan, Feb, which accounts for 51% 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 Humboldt County?

The average daily high in August, the hottest month, is 64.0°F. That drives 2 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Humboldt County?

Effectively no. Measurable snowfall is rare in Humboldt County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station EUREKA WFO WOODLEY ISLAND, CA US (USW00024213), 14.2 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.