December weather forecast
Aliso Viejo, CA

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Weather in December

December, the first month of the winter in Aliso Viejo, is also an enjoyable month, with temperature in the range of an average high of 62.8°F (17.1°C) and an average low of 50°F (10°C).

Temperature

In Aliso Viejo, California, December records the lowest average temperatures, peaking at 62.8°F (17.1°C) and reaching a low of 50°F (10°C).

Humidity

In December, the average relative humidity is 60%.

Rainfall

The month with the most rainfall is December, when the rain falls for 7 days and typically aggregates up to 0.87" (22mm) of precipitation.

Daylight

With an average of 10h and 0min of daylight, December has the shortest days of the year in Aliso Viejo, California.
On the first day of December, sunrise is at 6:37 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:53 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6.6h of sunshine.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 4 in December, converts into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. To protect against the Sun's most potent rays, avoid direct exposure around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.

Frequently asked questions

What is the coldest time of year?

Temperature readings reach their annual highs in December, averaging 62.8°F (17.1°C) and a minimum average of 50°F (10°C).

What are the temperatures in December?

December temperatures vary between a high-temperature of 62.8°F (17.1°C) and a low-temperature of 50°F (10°C).

What is the average humidity in December?

In December, the average relative humidity is 60%.

What is the wettest month?

The month with the most rainfall is December, when the rain falls for 7 days and typically aggregates up to 0.87" (22mm) of precipitation.

How much does it rain in December?

In Aliso Viejo, in December, during 7 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 10h and 0min of daylight.

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

In Aliso Viejo, the average day length in December is 9h and 58min.

What time are sunrise and sunset in December in Aliso Viejo?

On the first day of December, sunrise is at 6:37 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:53 pm PST.

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

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

How long on average sun shines in December?

The average sunshine duration in December is 6.6h.

When is the lowest UV index?

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index.

What is the UV index reading in December?

In Aliso Viejo, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Aliso Viejo, CA

Average temperature in December - Aliso Viejo, CA
  • Average high temperature in December: 62.8°F

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (62.8°F).

  • Average low temperature in December: 50°F

The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).

Average pressure in December
Aliso Viejo, CA

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

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Aliso Viejo, CA

Average wind speed in December - Aliso Viejo, CA
  • Average wind speed in December: 5.1mph

The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September and October (4.7mph).

Average humidity in December
Aliso Viejo, CA

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

The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (56%).

Average rainfall in December
Aliso Viejo, CA

Average rainfall in December - Aliso Viejo, CA
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is June (0.08").

Average rainfall days in December
Aliso Viejo, CA

Average rainfall days in December - Aliso Viejo, CA
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is June (2.6 days).

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

Average daylight in December / Average sunshine in December - Aliso Viejo, CA
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 4min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

Average sunshine days in December
Aliso Viejo, CA

Average sunshine days in December - Aliso Viejo, CA
  • Average sunshine days in December: 22.1 days

The month with the most sunshine days is January (24.1 days).
The month with the least sunshine days is February (19.6 days).

Average UV index in December
Aliso Viejo, CA

Average UV index in December - Aliso Viejo, CA
  • Average UV index in December: 4

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

Average cloud cover in December
Aliso Viejo, CA

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

The 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).

Average visibility in December
Aliso Viejo, CA

Average visibility in December - Aliso Viejo, 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).

Aliso Viejo, California, USA

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