December weather forecast
Placentia, CA

Weather in December

The first month of the winter, December, is still a comfortable month in Placentia, California, with an average temperature ranging between min 50.2°F (10.1°C) and max 64.2°F (17.9°C).

Temperature

With an average high-temperature of 64.2°F (17.9°C) and an average low-temperature of 50.2°F (10.1°C), December is the coldest month.

Humidity

In December, the average relative humidity in Placentia, California, is 54%.

Rainfall

December is the month with the most rainfall. Rain falls for 6.8 days and accumulates 1.65" (42mm) of precipitation.

Daylight

With an average of 9h and 56min of daylight, December has the shortest days of the year in Placentia, California.
On the first day of the month, sunrise is at 6:38 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:56 am and sunset at 4:52 pm PST.

Sunshine

The months with the least sunshine are February and December, with an average of 6.8h of sunshine.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 4 in December transform into the following instructions:
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 the 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.
[Resources]

FAQ

What is the coldest month in Placentia?

The coldest month is December, with an average high-temperature of 64.2°F (17.9°C) and an average low-temperature of 50.2°F (10.1°C).

What is the temperature in December in Placentia?

In December, in Placentia, California, the average high-temperature is 64.2°F (17.9°C), and the average low-temperature is 50.2°F (10.1°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, in September is estimated at 86°F (30°C).

What is the average humidity in December in Placentia?

In Placentia, California, the average relative humidity in December is 54%.

What is the rainiest month in Placentia?

The month with the most rainfall in Placentia is December, when the rain falls for 6.8 days and typically aggregates up to 1.65" (42mm) of precipitation.

How many days does it rain in December in Placentia?

In December, in Placentia, California, the rain falls for 6.8 days. Throughout December, 1.65" (42mm) of precipitation is accumulated.

What is the month with the shortest days in Placentia?

With an average of 9h and 56min of daylight, December has the shortest days of the year in Placentia, California.

How many hours of daylight does Placentia have in December?

In Placentia, the average day length in December is 9h and 56min.

What time are sunrise and sunset in December in Placentia?

On the first day of December in Placentia, California, sunrise is at 6:38 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 4:52 pm PST.

What are the months with the least sunshine in Placentia?

The months with the least sunshine are February and December, with an average of 6.8h of sunshine.

How many hours of sunshine does Placentia have in December?

In Placentia, the average sunshine duration in December is 6.8h.

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

The months with the lowest UV index in Placentia are January, February, November and December, with an average maximum UV index of 4.

What is the UV index reading in December in Placentia?

The average daily maximum UV index in December in Placentia is 4. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Placentia, CA

Average temperature in December - Placentia, CA
  • Average high temperature in December: 64.2°F

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is December (64.2°F).

  • Average low temperature in December: 50.2°F

The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (49.6°F).

[Resources]

Average pressure in December
Placentia, CA

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

[Resources]

Average wind speed in December
Placentia, CA

Average wind speed in December - Placentia, 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 September (4.5mph).

[Resources]

Average humidity in December
Placentia, CA

Average humidity in December - Placentia, CA
  • Average humidity in December: 54%

The month with the highest relative humidity is June (63%).
The month with the lowest relative humidity is November (50%).

[Resources]

Average rainfall in December
Placentia, CA

Average rainfall in December - Placentia, CA
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.04").

[Resources]

Average rainfall days in December
Placentia, CA

Average rainfall days in December - Placentia, CA
  • Average rainfall days in December: 6.8 days

The month with the highest number of rainy days is March (7.4 days).
The month with the least rainy days is June (1.4 days).

[Resources]

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

Average daylight in December / Average sunshine in December - Placentia, CA
  • Average daylight in December: 9h and 56min

The month with the longest days is June (Average daylight: 14h and 22min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in December: 6h and 48min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 48min).

[Resources]

Average sunshine days in December
Placentia, CA

Average sunshine days in December - Placentia, CA
  • Average sunshine days in December: 23.4 days

The month with the most sunshine days is August (26.7 days).
The month with the least sunshine days is February (20.7 days).

[Resources]

Average UV index in December
Placentia, CA

Average UV index in December - Placentia, 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, November and December (UV index 4).

[Resources]

Average cloud cover in December
Placentia, CA

Average cloud cover in December - Placentia, CA
  • Average cloud cover in December: 22

The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

[Resources]

Average visibility in December
Placentia, CA

Average visibility in December - Placentia, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location