December weather forecast
Arnold, CA

Weather in December

The first month of the winter, December, is still a chilly month in Arnold, California, with temperature in the range of an average low of 32°F (0°C) and an average high of 48°F (8.9°C).

Temperature

With an average high-temperature of 48°F (8.9°C) and an average low-temperature of 32°F (0°C), December is the coldest month.

Humidity

The average relative humidity in December in Arnold is 67%.

Rainfall

In Arnold, during 8.2 rainfall days, 4.76" (121mm) of precipitation is typically accumulated. In Arnold, during the entire year, the rain falls for 69 days and collects up to 29.09" (739mm) of precipitation.

Snowfall

Months with snowfall in Arnold are January through May, October through December. In Arnold, during 6 snowfall days, 11.06" (281mm) of snow is typically accumulated. In Arnold, during the entire year, snow falls for 31 days and aggregates up to 79.92" (2030mm) of snow.

Daylight

December has the shortest days of the year in Arnold, with an average of 9h and 34min of daylight.
On the first day of the month, sunrise is at 6:59 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:51 pm PST.

Sunshine

The month with the least sunshine is December, with an average of 6h of sunshine.

UV index

The months with the lowest UV index are February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Arnold?

December is the coldest month in Arnold, with an average high-temperature of 48°F (8.9°C) and an average low-temperature of 32°F (0°C).

What is the average humidity in December in Arnold?

In Arnold, the average relative humidity in December is 67%.

How much does it rain in Arnold in December?

In Arnold, California, in December, it is raining for 8.2 days, with typically 4.76" (121mm) of accumulated precipitation.

How many days does it snow in December in Arnold?

In Arnold, during December, snow falls for 6 days and regularly aggregates up to 11.06" (281mm) of snow.

What is the month with the shortest days in Arnold?

The month with the shortest days in Arnold, California, is December, with an average of 9h and 34min of daylight.

How many hours of daylight does Arnold have in December?

The average day length in December in Arnold is 9h and 34min.

When are sunrise and sunset in December in Arnold?

On the first day of December, sunrise is at 6:59 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:51 pm PST.

What is the month with the least sunshine in Arnold?

With an average of 6h of sunshine, December has the least sunshine of the year in Arnold.

How long on average sun shines in December in Arnold?

In December, the average sunshine duration in Arnold is 6h.

When is the lowest UV index in Arnold?

The months with the lowest UV index in Arnold are February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Arnold?

In December, the average daily maximum UV index in Arnold is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Arnold, CA

Average temperature in December - Arnold, CA
  • Average high temperature in December: 48°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (48°F).

  • Average low temperature in December: 32°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (32°F).

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Average pressure in December
Arnold, CA

Average pressure in December - Arnold, CA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Arnold, CA

Average wind speed in December - Arnold, CA
  • Average wind speed in December: 5.3mph

The windiest month (with the highest average wind speed) is February (6.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in December
Arnold, CA

Average humidity in December - Arnold, CA
  • Average humidity in December: 67%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (36%).

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Average rainfall in December
Arnold, CA

Average rainfall in December - Arnold, CA
  • Average rainfall in December: 4.76"

The wettest month (with the highest rainfall) is March (5.98").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in December
Arnold, CA

Average rainfall days in December - Arnold, CA
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is March (11.3 days).
The month with the least rainy days is August (1.6 days).

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Average snowfall in December
Arnold, CA

Average snowfall in December - Arnold, CA
  • Average snowfall in December: 11.06"

The month with the highest snowfall is March (21.34").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Arnold, CA

Average snowfall days in December - Arnold, CA
  • Average snowfall days in December: 6 days

The month with the highest number of snowfall days is March (7.2 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Arnold, CA
  • Average daylight in December: 9h and 34min

The month with the longest days is June (Average daylight: 14h and 47min).
The month with the shortest days is December (Average daylight: 9h and 34min).

  • Average sunshine in December: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in December
Arnold, CA

Average sunshine days in December - Arnold, CA
  • Average sunshine days in December: 19.5 days

The month with the most sunshine days is August (27.9 days).
The month with the least sunshine days is March (14.5 days).

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Average UV index in December
Arnold, CA

Average UV index in December - Arnold, CA
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 2).

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Average cloud cover in December
Arnold, CA

Average cloud cover in December - Arnold, CA
  • Average cloud cover in December: 32

The month with the most cloud cover is March (Cloud cover 37).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Arnold, CA

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

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

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