December weather forecast and climate
Healdsburg, CA

Neat rows of plants in a farm with a view of a red farmhouse up the hill in Healdsburg, California
Neat rows of plants in a farm with a view of a red farmhouse up the hill in Healdsburg, California

Weather in December

December, the first month of the winter, in Healdsburg, is also a fresh month, with average temperature ranging between max 55°F (12.8°C) and min 40.1°F (4.5°C).

Temperature

With an average high-temperature of 55°F (12.8°C) and an average low-temperature of 40.1°F (4.5°C), December is the coldest month.

Humidity

In December, the average relative humidity is 74%.

Rainfall

In Healdsburg, it is raining for 11.5 days, with typically 3.43" (87mm) of accumulated precipitation. In Healdsburg, California, during the entire year, the rain falls for 81.2 days and collects up to 19.84" (504mm) of precipitation.

Snowfall

January, March through December are months without snowfall in Healdsburg.

Daylight

December has the shortest days of the year, with an average of 9.5h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 5.6h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in Healdsburg?

With an average high-temperature of 55°F (12.8°C) and an average low-temperature of 40.1°F (4.5°C), December is the coldest month in Healdsburg, California.

What is the temperature in December in Healdsburg?

In Healdsburg, in December, the average high-temperature is 55°F (12.8°C), and the average low-temperature is 40.1°F (4.5°C).

What is the average humidity in December in Healdsburg?

In Healdsburg, the average relative humidity in December is 74%.

How much does it rain in Healdsburg in December?

In Healdsburg, during December, the rain falls for 11.5 days and regularly aggregates up to 3.43" (87mm) of precipitation.

When it does not snow in Healdsburg?

January, March through December are months without snowfall.

What is the month with the shortest days in Healdsburg?

The month with the shortest days is December, with an average of 9.5h of daylight.

What is the average length of the day in December in Healdsburg?

In December, the average length of the day is 9.5h.

What is the month with the least sunshine in Healdsburg?

With an average of 5.6h of sunshine, December has the least sunshine of the year in Healdsburg.

How many hours of sunshine does Healdsburg have in December?

In December, the average sunshine in Healdsburg is 5.6h.

What is the month with the lowest UV index in Healdsburg?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3.

What is the UV index intensity in December in Healdsburg?

In Healdsburg, the average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in December
Healdsburg, CA

Average temperature in December - Healdsburg, CA
  • Average high temperature in December: 55°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in December: 40.1°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (40.1°F).

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Average pressure in December
Healdsburg, CA

Average pressure in December - Healdsburg, CA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in December
Healdsburg, CA

Average wind speed in December - Healdsburg, CA
  • Average wind speed in December: 4.7mph

The windiest months (with the highest average wind speed) are April and May (6.2mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity in December
Healdsburg, CA

Average humidity in December - Healdsburg, CA
  • Average humidity in December: 74%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (57%).

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Average rainfall in December
Healdsburg, CA

Average rainfall in December - Healdsburg, CA
  • Average rainfall in December: 3.43"

The wettest month (with the highest rainfall) is February (4.33").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Healdsburg, CA

Average rainfall days in December - Healdsburg, CA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is March (14.2 days).
The month with the least rainy days is August (0.8 days).

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Average snowfall in December
Healdsburg, CA

Average snowfall in December - Healdsburg, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.04").
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
Healdsburg, CA

Average snowfall days in December - Healdsburg, CA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in December /
Average sunshine in December
Healdsburg, CA

Average daylight in December / Average sunshine in December - Healdsburg, CA
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.6h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.6h).

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Average sunshine days in December
Healdsburg, CA

Average sunshine days in December - Healdsburg, CA
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).

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Average UV index in December
Healdsburg, CA

Average UV index in December - Healdsburg, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Healdsburg, CA

Average cloud cover in December - Healdsburg, CA
  • Average cloud cover in December: 38

The month with the most cloud cover is March (Cloud cover 41).
Months with the least cloud cover are July and August (Cloud cover 6).

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Average visibility in December
Healdsburg, CA

Average visibility in December - Healdsburg, CA
  • Average visibility in December: 6mi

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

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