December weather forecast and climate
Spring Valley, CA

Weather in December

The first month of the winter, December, is also an enjoyable month in Spring Valley, California, with average temperature varying between 49.3°F (9.6°C) and 64.4°F (18°C).

Temperature

The coldest month is December, with an average high-temperature of 64.4°F (18°C) and an average low-temperature of 49.3°F (9.6°C).

Humidity

In December, the average relative humidity is 59%.

Rainfall

In December, in Spring Valley, the rain falls for 3.5 days. Throughout December, 0.51" (13mm) of precipitation is accumulated. Throughout the year, there are 33 rainfall days, and 2.52" (64mm) of precipitation is accumulated.

Daylight

The month with the shortest days in Spring Valley, California, is December, with an average of 10h of daylight.

Sunshine

Months with the least sunshine are February and December, with an average of 6.7h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Spring Valley. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 Spring Valley?

With an average high-temperature of 64.4°F (18°C) and an average low-temperature of 49.3°F (9.6°C), December is the coldest month.

What is the temperature in December in Spring Valley?

In December, in Spring Valley, the average high-temperature is 64.4°F (18°C), and the average low-temperature is 49.3°F (9.6°C).

What is the average humidity in December in Spring Valley?

In December, the average relative humidity in Spring Valley, California, is 59%.

How many days does it rain in December in Spring Valley?

In Spring Valley, in December, during 3.5 rainfall days, 0.51" (13mm) of precipitation is typically accumulated.

What is the month with the shortest days in Spring Valley?

December has the shortest days of the year, with an average of 10h of daylight.

How many hours of daylight does Spring Valley have in December?

The average length of the day in December in Spring Valley is 10h.

What is the month with the least sunshine in Spring Valley?

February and December, with an average of 6.7h of sunshine, are months with the least sunshine in Spring Valley.

How many hours of sunshine does Spring Valley have in December?

In December, the average sunshine in Spring Valley is 6.7h.

When is the lowest UV index in Spring Valley?

Months with the lowest UV index in Spring Valley, California, are January, February, November and December, with an average maximum UV index of 4.

What is the UV index intensity in December in Spring Valley?

The average daily maximum UV index in December is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Spring Valley, CA

Average temperature in December - Spring Valley, CA
  • Average high temperature in December: 64.4°F

The warmest month (with the highest average high temperature) is August (82.9°F).
The month with the lowest average high temperature is December (64.4°F).

  • Average low temperature in December: 49.3°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).

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Average pressure in December
Spring Valley, CA

Average pressure in December - Spring Valley, CA
  • Average pressure in December: 30.06"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in December
Spring Valley, CA

Average wind speed in December - Spring Valley, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).

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Average humidity in December
Spring Valley, CA

Average humidity in December - Spring Valley, CA
  • Average humidity in December: 59%

The month with the highest relative humidity is May (67%).
The month with the lowest relative humidity is November (54%).

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Average rainfall in December
Spring Valley, CA

Average rainfall in December - Spring Valley, CA
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is February (0.55").
The driest months (with the least rainfall) are June, July and October (0.04").

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Average rainfall days in December
Spring Valley, CA

Average rainfall days in December - Spring Valley, CA
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is March (5.3 days).
The month with the least rainy days is June (0.8 days).

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Average daylight in December /
Average sunshine in December
Spring Valley, CA

Average daylight in December / Average sunshine in December - Spring Valley, CA
  • Average daylight in December: 10h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 6.7h

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.7).

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Average sunshine days in December
Spring Valley, CA

Average sunshine days in December - Spring Valley, CA
  • Average sunshine days in December: 26.7 days

The month with the most sunshine days is October (28.9 days).
The month with the least sunshine days is February (23.4 days).

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Average UV index in December
Spring Valley, CA

Average UV index in December - Spring Valley, CA
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in December
Spring Valley, CA

Average cloud cover in December - Spring Valley, CA
  • Average cloud cover in December: 24

Months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in December
Spring Valley, CA

Average visibility in December - Spring Valley, 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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