December weather forecast and climate
Calpella, CA

Weather in December

December, the first month of the winter, in Calpella, is still a cool month, with average temperature varying between 53.6°F (12°C) and 37.4°F (3°C).

Temperature

December is the coldest month, with an average high-temperature of 53.6°F (12°C) and an average low-temperature of 37.4°F (3°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

Months with the most rainfall are February and December, with an average 3.11" (79mm) of precipitation.

Snowfall

In Calpella snow does not fall in January, March through December.

Daylight

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

Sunshine

The month with the least sunshine in Calpella is December, with an average of 5.3h of sunshine.

UV index

The average daily maximum UV index in Calpella is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 3 in December transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the coldest month in Calpella?

December is the coldest month, with an average high-temperature of 53.6°F (12°C) and an average low-temperature of 37.4°F (3°C).

What is the temperature in December in Calpella?

The average high-temperature, in December, is 53.6°F (12°C), while the average low-temperature is 37.4°F (3°C).

What is the average humidity in December in Calpella?

In Calpella, the average relative humidity in December is 76%.

How much does it rain in Calpella in December?

In Calpella, California, in December, it is raining for 12.5 days, with typically 3.11" (79mm) of accumulated precipitation.

What is the wettest month in Calpella?

Months with the most rainfall in Calpella, California, are February and December, with an average 3.11" (79mm) of precipitation.

When it does not snow in Calpella?

January, March through December are months without snowfall.

What is the month with the shortest days in Calpella?

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

How many hours of daylight does Calpella have in December?

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

What is the month with the least sunshine in Calpella?

With an average of 5.3h of sunshine, December has the least sunshine of the year in Calpella.

How long on average sun shines in December in Calpella?

The average sunshine in December in Calpella is 5.3h.

How high is the UV index in December in Calpella?

In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Calpella, CA

Average temperature in December - Calpella, CA
  • Average high temperature in December: 53.6°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (53.6°F).

  • Average low temperature in December: 37.4°F

The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is December (37.4°F).

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Average pressure in December
Calpella, CA

Average pressure in December - Calpella, 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 June, August and September (29.92").

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Average wind speed in December
Calpella, CA

Average wind speed in December - Calpella, CA
  • Average wind speed in December: 4.5mph

The windiest months (with the highest average wind speed) are April, May and June (5.5mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).

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Average humidity in December
Calpella, CA

Average humidity in December - Calpella, CA
  • Average humidity in December: 76%

The month with the highest relative humidity is March (79%).
Months with the lowest relative humidity are July and September (58%).

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Average rainfall in December
Calpella, CA

Average rainfall in December - Calpella, CA
  • Average rainfall in December: 3.11"

The wettest months (with the highest rainfall) are February and December (3.11").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in December
Calpella, CA

Average rainfall days in December - Calpella, CA
  • Average rainfall days in December: 12.5 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is August (1.3 days).

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Average snowfall in December
Calpella, CA

Average snowfall in December - Calpella, 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
Calpella, CA

Average snowfall days in December - Calpella, CA
  • Average snowfall days in December: 0 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, November and December (0 days).

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

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.3h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 5.3h).

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Average sunshine days in December
Calpella, CA

Average sunshine days in December - Calpella, CA
  • Average sunshine days in December: 17.6 days

The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (15.9 days).

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Average UV index in December
Calpella, CA

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

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are February and November (UV index 2).

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Average cloud cover in December
Calpella, CA

Average cloud cover in December - Calpella, CA
  • Average cloud cover in December: 42

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in December
Calpella, CA

Average visibility in December - Calpella, CA
  • Average visibility in December: 5mi

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

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