December weather forecast and climate
Rio Dell, CA

Weather in December

The first month of the winter, December, is also a fresh month in Rio Dell, California, with temperature in the range of an average high of 52.9°F (11.6°C) and an average low of 40.1°F (4.5°C).

Temperature

December is the coldest month, with an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 40.1°F (4.5°C).

Humidity

The average relative humidity in December is 81%.

Rainfall

The month with the most rainfall is December when the rain falls for 14.8 days and typically aggregates up to 4.96" (126mm) of precipitation.

Snowfall

January, March through December are months without snowfall in Rio Dell.

Daylight

The month with the shortest days in Rio Dell is December, with an average of 9.3h of daylight.

Sunshine

December has the least sunshine of the year, with an average of 5h of sunshine.

UV index

January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Rio Dell?

December is the coldest month in Rio Dell, California, with an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 40.1°F (4.5°C).

What is the temperature in December in Rio Dell?

In December, in Rio Dell, California, the average high-temperature is 52.9°F (11.6°C), and the average low-temperature is 40.1°F (4.5°C).

What is the average humidity in December in Rio Dell?

In December, the average relative humidity is 81%.

How many days does it rain in December in Rio Dell?

In December, in Rio Dell, California, the rain falls for 14.8 days. Throughout December, 4.96" (126mm) of precipitation is accumulated.

What is the rainiest month in Rio Dell?

The month with the most rainfall in Rio Dell, California, is December when the rain falls for 14.8 days and typically aggregates up to 4.96" (126mm) of precipitation.

When it does not snow in Rio Dell?

In Rio Dell, California, snow does not fall in January, March through December.

What is the month with the shortest days in Rio Dell?

December has the shortest days of the year, with an average of 9.3h of daylight.

How many hours of daylight does Rio Dell have in December?

The average length of the day in December in Rio Dell, California, is 9.3h.

What is the month with the least sunshine in Rio Dell?

With an average of 5h of sunshine, December has the least sunshine of the year in Rio Dell, California.

How many hours of sunshine does Rio Dell have in December?

In December, the average sunshine is 5h.

What are the months with the lowest UV index in Rio Dell?

Months with the lowest UV index in Rio Dell are January through March, November and December, with an average maximum UV index of 3.

How high is the UV index in December in Rio Dell?

In December, the average daily maximum UV index in Rio Dell, California, is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in December
Rio Dell, CA

Average temperature in December - Rio Dell, CA
  • Average high temperature in December: 52.9°F

The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in December: 40.1°F

The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is February (39.7°F).

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Average pressure in December
Rio Dell, CA

Average pressure in December - Rio Dell, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are August and September (29.96").

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Average wind speed in December
Rio Dell, CA

Average wind speed in December - Rio Dell, CA
  • Average wind speed in December: 7mph

The windiest month (with the highest average wind speed) is June (7.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average humidity in December
Rio Dell, CA

Average humidity in December - Rio Dell, CA
  • Average humidity in December: 81%

The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is September (73%).

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Average rainfall in December
Rio Dell, CA

Average rainfall in December - Rio Dell, CA
  • Average rainfall in December: 4.96"

The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days in December
Rio Dell, CA

Average rainfall days in December - Rio Dell, CA
  • Average rainfall days in December: 14.8 days

The month with the highest number of rainy days is March (17.3 days).
Months with the least rainy days are July and August (1.8 days).

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Average snowfall in December
Rio Dell, CA

Average snowfall in December - Rio Dell, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.59").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in December
Rio Dell, CA

Average snowfall days in December - Rio Dell, CA
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is February (0.3 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in December /
Average sunshine in December
Rio Dell, CA

Average daylight in December / Average sunshine in December - Rio Dell, CA
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 5h

Months with the most sunshine are July and August (Average sunshine: 11.6h).
The month with the least sunshine is December (Average sunshine: 5h).

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Average sunshine days in December
Rio Dell, CA

Average sunshine days in December - Rio Dell, CA
  • Average sunshine days in December: 15.1 days

The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (11.9 days).

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Average UV index in December
Rio Dell, CA

Average UV index in December - Rio Dell, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 3).

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Average cloud cover in December
Rio Dell, CA

Average cloud cover in December - Rio Dell, CA
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in December
Rio Dell, CA

Average visibility in December - Rio Dell, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, June, September, October, November and December (6mi).
Months with the lowest visibility are May, July and August (5mi).

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