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Humboldt County Weather

Humboldt County experiences many different changes in weather and climate- mainly because of their location. As a whole, they experience cool, dry summers, rainy winters, with an average yearly temperature of 55 degrees Fahrenheit. Temperatures rarely drop below freezing.

These conditions (32 degrees or lower) are usually only experienced throughout the winter but colder temperatures can easily reach more centrally located areas. The maximum readings you will find on the coast do exceed 80 degree Fahrenheit while readings of 100 degrees or more can very often be found in the mountain valleys.


Humboldt County experiences a lot of coastal fog all year long. The annual amount of precipitation tends to average out around 38.1 inches. Precipitation generally falls just over 119 days every year. 1983 was the wettest year and accumulated a staggering 67.21 inches of rain while the driest year (1976) only collected 21.71 inches of rain.

As for the greatest monthly precipitation, the largest recorded number happened in December of 2002 and was 23.21 inches. Within a 24-hour cycle, precipitation has reached 6.79 inches (December 27th, 2002) which was almost 1/3 of the monthly amount of rain fall.


Finding any amount of snowfall on the coast is extremely rare. The average of there only reads at about .04 inches (for the year), but the median is 0; meaning that some years don’t receive an ounce of snow. However, there was a day (February 4th, 1989) when 2-inches of snow fell in Eureka and even more cam in throughout the month, measuring at a whopping 3.5 inches.

Arcata, California

Arcata usually experiences most of its warmer months in the summer (July and August). The highest recorded temperature they experienced was way back in 1993; and that only hit 87 degree Fahrenheit. Needless to say, they are a much cooler section of Humboldt. The coldest months are usually in January and the lowest ever recorded temperature happened in 1988 (only 20 degrees). Finally, the maximum amount of precipitation generally occurs around December. If you are looking for a cooler area with then Arcata is the place to find it.

Redwood, California

The coast of Redwood exudes a rather mild, year-around climate. Day time temperatures from the low 50’s in the winter to the high 60’s in the summer. On few occasions you might find it hitting the mid-70’s (very rare though). Greater ranges are generally found more inland, towards the center of Redwood.

The Humboldt Bay gets less than 35-inches of rain every year. Most of this precipitation falls between March and December and dies down heavily during the winter months. Warm, sunny days are common for Humboldt Bay and can usually get very foggy. Bring a light jacket or a rain coat if you plan on spending an extended amount of time in or around Humboldt Bay.

Willowcreek, California

Willowcreek experiences warm summers with temperatures averaging at about 70-degrees; winters hover around the lower 40’s. The warmest month of the year is July with a maximum temperature being around 97 degrees Fahrenheit. The coldest month of the year is January where it can reach as low as 34.5 degrees. The largest gap in temperatures tends to be during the summer with a total difference of 42 degrees; winter with about a 19 degree spread. The annual precipitation is about 55-inches. Ironically, winter months tend to produce the most amount of rain (about 10-inches worth).


As a whole, Humboldt County’s climate is very different depending on what area you are talking about. As a general rule of thumb, expect days which are hot but breezy, and winters which are cold (but not freezing).

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