December weather forecast and climate
Pomona, CA

Trails in the rural mountainous region of Pomona, California, with scenic slopes and dense population down below
Trails in the rural mountainous region of Pomona, California, with scenic slopes and dense population down below

Weather in December

The first month of the winter, December, is also an enjoyable month in Pomona, California, with average temperature fluctuating between 63.1°F (17.3°C) and 46.8°F (8.2°C).

Temperature

December is the coldest month, with an average high-temperature of 63.1°F (17.3°C) and an average low-temperature of 46.8°F (8.2°C).

Humidity

In December, the average relative humidity is 51%.

Rainfall

Months with the most rainfall are February and December, with an average 1.65" (42mm) of precipitation.

Snowfall

January, March through December are months without snowfall.

Daylight

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

Sunshine

Months with the least sunshine are February and December, with an average of 6.9h of sunshine.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 4 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 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.
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FAQ

What is the coldest month in Pomona?

The coldest month is December, with an average high-temperature of 63.1°F (17.3°C) and an average low-temperature of 46.8°F (8.2°C).

What is the average humidity in December in Pomona?

In December, the average relative humidity in Pomona is 51%.

What is the wettest month in Pomona?

Months with the most rainfall in Pomona, California, are February and December, with an average 1.65" (42mm) of precipitation.

How many days does it rain in December in Pomona?

In Pomona, in December, during 5.8 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

When it does not snow in Pomona?

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

What is the month with the shortest days in Pomona?

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

What is the average length of the day in December in Pomona?

In Pomona, the average length of the day in December is 9.9h.

What is the month with the least sunshine in Pomona?

Months with the least sunshine in Pomona, California, are February and December, with an average of 6.9h of sunshine.

How long on average sun shines in December in Pomona?

In Pomona, California, the average sunshine in December is 6.9h.

What are the months with the lowest UV index in Pomona?

Months with the lowest UV index in Pomona, California, are January, February, November and December, with an average maximum UV index of 4.

What is the UV index intensity in December in Pomona?

In December, the average daily maximum UV index in Pomona, California, is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in December
Pomona, CA

Average temperature in December - Pomona, CA
  • Average high temperature in December: 63.1°F

The warmest month (with the highest average high temperature) is August (90.1°F).
The month with the lowest average high temperature is December (63.1°F).

  • Average low temperature in December: 46.8°F

The month with the highest average low temperature is August (65.7°F).
The coldest months (with the lowest average low temperature) are February and December (46.8°F).

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Average pressure in December
Pomona, CA

Average pressure in December - Pomona, 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 (29.87").

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Average wind speed in December
Pomona, CA

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

The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in December
Pomona, CA

Average humidity in December - Pomona, CA
  • Average humidity in December: 51%

The month with the highest relative humidity is May (56%).
Months with the lowest relative humidity are August and November (45%).

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Average rainfall in December
Pomona, CA

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

The wettest months (with the highest rainfall) are February and December (1.65").
The driest months (with the least rainfall) are June and August (0.04").

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Average rainfall days in December
Pomona, CA

Average rainfall days in December - Pomona, CA
  • Average rainfall days in December: 5.8 days

The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (0.8 days).

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Average snowfall days in December
Pomona, CA

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

The month with the highest number of snowfall days is February (0.1 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
Pomona, CA

Average daylight in December / Average sunshine in December - Pomona, 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: 6.9h

The month with the most sunshine is July (Average sunshine: 12.2h).
Months with the least sunshine are February and December (Average sunshine: 6.9).

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Average sunshine days in December
Pomona, CA

Average sunshine days in December - Pomona, CA
  • Average sunshine days in December: 23.7 days

The month with the most sunshine days is June (28.7 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in December
Pomona, CA

Average UV index in December - Pomona, CA
  • Average UV index in December: 4

The month with the highest UV index is August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in December
Pomona, CA

Average cloud cover in December - Pomona, CA
  • Average cloud cover in December: 21

Months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).

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Average visibility in December
Pomona, CA

Average visibility in December - Pomona, 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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