December weather forecast and climate
Mission Viejo, CA

The calm waters on Lake Mission Viejo, California,
The calm waters on Lake Mission Viejo, California,

Weather in December

December, the first month of the winter, in Mission Viejo, is still a comfortable month, with average temperature fluctuating between 49.8°F (9.9°C) and 63°F (17.2°C).

Temperature

The coldest month is December, with an average high-temperature of 63°F (17.2°C) and an average low-temperature of 49.8°F (9.9°C).

Humidity

In December, the average relative humidity is 60%.

Rainfall

The month with the most rainfall is December when the rain falls for 6.7 days and typically aggregates up to 0.98" (25mm) of precipitation.

Daylight

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

Sunshine

The month with the least sunshine is December, with an average of 6.6h of sunshine.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Mission Viejo. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: In December, the average maximum UV index of 4 translate into the following recommendations:
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. 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.
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FAQ

What is the coldest month in Mission Viejo?

With an average high-temperature of 63°F (17.2°C) and an average low-temperature of 49.8°F (9.9°C), December is the coldest month in Mission Viejo, California.

What is the temperature in December in Mission Viejo?

The average high-temperature, in December, in Mission Viejo, is 63°F (17.2°C), while the average low-temperature is 49.8°F (9.9°C).

What is the average humidity in December in Mission Viejo?

In Mission Viejo, California, the average relative humidity in December is 60%.

How much does it rain in Mission Viejo in December?

In Mission Viejo, California, in December, it is raining for 6.7 days, with typically 0.98" (25mm) of accumulated precipitation.

What is the rainiest month in Mission Viejo?

The month with the most rainfall in Mission Viejo is December when the rain falls for 6.7 days and typically aggregates up to 0.98" (25mm) of precipitation.

What is the month with the shortest days in Mission Viejo?

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

What is the average length of the day in December in Mission Viejo?

The average length of the day in December in Mission Viejo is 10h.

What is the month with the least sunshine in Mission Viejo?

With an average of 6.6h of sunshine, December has the least sunshine of the year in Mission Viejo.

How long on average sun shines in December in Mission Viejo?

The average sunshine in December is 6.6h.

What is the month with the lowest UV index in Mission Viejo?

Months with the lowest UV index in Mission Viejo are January through March, November and December, with an average maximum UV index of 4.

How high is the UV index in December in Mission Viejo?

In December, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in December
Mission Viejo, CA

Average temperature in December - Mission Viejo, CA
  • Average high temperature in December: 63°F

The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (63°F).

  • Average low temperature in December: 49.8°F

The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is February (48.7°F).

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Average pressure in December
Mission Viejo, CA

Average pressure in December - Mission Viejo, CA
  • Average pressure in December: 30.07"

The month with the highest atmospheric pressure is January (30.1").
Months with the lowest atmospheric pressure are June and September (29.88").

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Average wind speed in December
Mission Viejo, CA

Average wind speed in December - Mission Viejo, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in December
Mission Viejo, CA

Average humidity in December - Mission Viejo, CA
  • Average humidity in December: 60%

Months with the highest relative humidity are May and June (70%).
The month with the lowest relative humidity is November (56%).

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Average rainfall in December
Mission Viejo, CA

Average rainfall in December - Mission Viejo, CA
  • Average rainfall in December: 0.98"

The wettest month (with the highest rainfall) is December (0.98").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in December
Mission Viejo, CA

Average rainfall days in December - Mission Viejo, CA
  • Average rainfall days in December: 6.7 days

The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is June (2.3 days).

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Average daylight in December /
Average sunshine in December
Mission Viejo, CA

Average daylight in December / Average sunshine in December - Mission Viejo, CA
  • Average daylight in December: 10h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 6.6h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.6h).

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Average sunshine days in December
Mission Viejo, CA

Average sunshine days in December - Mission Viejo, CA
  • Average sunshine days in December: 22.6 days

Months with the most sunshine days are January and August (24.4 days).
The month with the least sunshine days is May (19.5 days).

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Average UV index in December
Mission Viejo, CA

Average UV index in December - Mission Viejo, 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, March, November and December (UV index 4).

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Average cloud cover in December
Mission Viejo, CA

Average cloud cover in December - Mission Viejo, CA
  • Average cloud cover in December: 25

Months with the most cloud cover are March and December (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in December
Mission Viejo, CA

Average visibility in December - Mission Viejo, 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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