December weather forecast and climate
Spreckels, CA

Weather in December

December, the first month of the winter, in Spreckels, is still a mild month, with average temperature ranging between min 44.1°F (6.7°C) and max 57.6°F (14.2°C).

Temperature

December is the coldest month, with an average high-temperature of 57.6°F (14.2°C) and an average low-temperature of 44.1°F (6.7°C).

Humidity

The average relative humidity is 71%.

Rainfall

December is the month with the most rainfall in Spreckels. Rain falls for 8.5 days and accumulates 1.38" (35mm) of precipitation.

Daylight

December has the shortest days of the year, with an average of 9.7h of daylight.

Sunshine

December has the least sunshine of the year in Spreckels, with an average of 6h of sunshine.

UV index

February, 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 threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Spreckels?

December is the coldest month in Spreckels, California, with an average high-temperature of 57.6°F (14.2°C) and an average low-temperature of 44.1°F (6.7°C).

What is the temperature in December in Spreckels?

The average high-temperature, in December, in Spreckels, is 57.6°F (14.2°C), while the average low-temperature is 44.1°F (6.7°C).

What is the average humidity in December in Spreckels?

The average relative humidity in December in Spreckels, California, is 71%.

How many days does it rain in December in Spreckels?

In Spreckels, in December, during 8.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

What is the rainiest month in Spreckels?

December is the month with the most rainfall in Spreckels. Rain falls for 8.5 days and accumulates 1.38" (35mm) of precipitation.

What is the month with the shortest days in Spreckels?

The month with the shortest days is December, with an average of 9.7h of daylight.

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

In December, the average length of the day is 9.7h.

What is the month with the least sunshine in Spreckels?

December has the least sunshine of the year in Spreckels, California, with an average of 6h of sunshine.

How long on average sun shines in December in Spreckels?

The average sunshine in December in Spreckels is 6h.

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

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

How high is the UV index in December in Spreckels?

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

Average temperature in December
Spreckels, CA

Average temperature in December - Spreckels, CA
  • Average high temperature in December: 57.6°F

The warmest months (with the highest average high temperature) are August and September (76.1°F).
The month with the lowest average high temperature is December (57.6°F).

  • Average low temperature in December: 44.1°F

Months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (44.1°F).

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Average pressure in December
Spreckels, CA

Average pressure in December - Spreckels, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is September (29.92").

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Average wind speed in December
Spreckels, CA

Average wind speed in December - Spreckels, CA
  • Average wind speed in December: 5.5mph

The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).

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Average humidity in December
Spreckels, CA

Average humidity in December - Spreckels, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in December
Spreckels, CA

Average rainfall in December - Spreckels, CA
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is December (1.38").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in December
Spreckels, CA

Average rainfall days in December - Spreckels, CA
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.8 days).

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

Average daylight in December / Average sunshine in December - Spreckels, CA
  • Average daylight in December: 9.7h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in December: 6h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in December
Spreckels, CA

Average sunshine days in December - Spreckels, CA
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is August (28.6 days).
The month with the least sunshine days is March (19.2 days).

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Average UV index in December
Spreckels, CA

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

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

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Average cloud cover in December
Spreckels, CA

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

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in December
Spreckels, CA

Average visibility in December - Spreckels, 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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