December weather forecast
Perris, CA

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Landscape in the State Recreation Area on Lake Perris, California
Landscape in the State Recreation Area on Lake Perris, California

Weather in December

The first month of the winter, December, is still a comfortable month in Perris, California, with an average temperature fluctuating between 43°F (6.1°C) and 61°F (16.1°C).

Temperature

December, characterized by an average high temperature of 61°F (16.1°C) and a low temperature of 43°F (6.1°C), is generally the coldest month.

Humidity

In December, the average relative humidity is 56%.

Rainfall

December is the month with the most rainfall. Rain falls for 6.5 days and accumulates 1.38" (35mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

December has the shortest days of the year, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 6:36 am and sunset at 4:40 pm. On the last day of December, sunrise is at 6:53 am and sunset at 4:50 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6.7h of sunshine.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 3 during December translates into the following guidance:
Undertake precautions - Guarding against sun damage is counselled. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Updated: Jun 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

December, with its high-temperature average of 61°F (16.1°C) and a low-temperature average of 43°F (6.1°C), is the coldest month.

What is the usual temperature for Perris in December?

In December, in Perris, the average high-temperature is 61°F (16.1°C), and the average low-temperature is 43°F (6.1°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is estimated at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 56%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 6.5 days and accumulates 1.38" (35mm) of precipitation.

How many days does it rain in December?

In Perris, in December, during 6.5 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

When it does not snow?

January, March through December are months without snowfall.

What is the month with the shortest days?

The month with the shortest days in Perris is December, with an average of 10h and 0min of daylight.

How many hours of daylight does Perris have in December?

The average day length in December is 9h and 57min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 6:36 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 4:50 pm PST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 6.7h of sunshine.

How many hours of sunshine does Perris have in December?

The average sunshine duration in December is 6.7h.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 3.

What is the UV index reading in December?

The average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Perris, CA

Average temperature in December - Perris, CA
  • Average high temperature in December: 61°F

The warmest month (with the highest average high temperature) is August (89.6°F).
The month with the lowest average high temperature is December (61°F).

  • Average low temperature in December: 43°F

The month with the highest average low temperature is August (63.3°F).
The coldest month (with the lowest average low temperature) is December (43°F).

Average pressure in December
Perris, CA

Average pressure in December - Perris, 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 (29.85"Hg).

Average wind speed in December
Perris, CA

Average wind speed in December - Perris, CA
  • Average wind speed in December: 4.8mph

The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest months (with the lowest average wind speed) are August and September (4.2mph).

Average humidity in December
Perris, CA

Average humidity in December - Perris, CA
  • Average humidity in December: 56%

The month with the highest relative humidity is May (60%).
The month with the lowest relative humidity is August (47%).

Average rainfall in December
Perris, CA

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

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

Average rainfall days in December
Perris, CA

Average rainfall days in December - Perris, CA
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.3 days).

Average snowfall in December
Perris, CA

Average snowfall in December - Perris, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in December
Perris, CA

Average snowfall days in December - Perris, CA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

Average sunshine days in December
Perris, CA

Average sunshine days in December - Perris, CA
  • Average sunshine days in December: 23.5 days

The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (21.6 days).

Average UV index in December
Perris, CA

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

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in December
Perris, CA

Average cloud cover in December - Perris, CA
  • Average cloud cover in December: 24

The months with the most cloud cover are March and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in December
Perris, CA

Average visibility in December - Perris, 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).

Perris, California, USA

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