December weather forecast and climate
Perris, CA

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

Weather in December

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

Temperature

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

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

In Perris snow does not fall in January, March through December.

Daylight

December has the shortest days of the year in Perris, with an average of 9.9h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 6.7h of sunshine.

UV index

With an average maximum UV index of 3, December is the month with the lowest UV index in Perris. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. 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 Perris?

With an average high-temperature of 61°F (16.1°C) and an average low-temperature of 43°F (6.1°C), December is the coldest month in Perris.

What is the temperature in December in Perris?

In Perris, California, in December, the average high-temperature is 61°F (16.1°C), and the average low-temperature is 43°F (6.1°C).

What is the average humidity in December in Perris?

In December, the average relative humidity is 56%.

How much does it rain in Perris in December?

In Perris, California, in December, it is raining for 6.5 days, with typically 1.38" (35mm) of accumulated precipitation.

What is the rainiest month in Perris?

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

When it does not snow in Perris?

January, March through December are months without snowfall in Perris.

What is the month with the shortest days in Perris?

The month with the shortest days in Perris is December, with an average of 9.9h of daylight.

How many hours of daylight does Perris have in December?

The average length of the day in December in Perris is 9.9h.

What is the month with the least sunshine in Perris?

The month with the least sunshine in Perris is December, with an average of 6.7h of sunshine.

How many hours of sunshine does Perris have in December?

The average sunshine in December in Perris, California, is 6.7h.

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

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

What is the UV index intensity in December in Perris?

In Perris, California, the average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.

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).

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Average pressure in December
Perris, CA

Average pressure in December - Perris, CA
  • Average pressure in December: 30.07"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.85").

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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).

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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%).

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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").

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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).

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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").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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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).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in December / Average sunshine in December - Perris, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.7h

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

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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).

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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).

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Average cloud cover in December
Perris, CA

Average cloud cover in December - Perris, 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 5).

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Average visibility in December
Perris, CA

Average visibility in December - Perris, 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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