December weather forecast and climate
Fontana, CA

Weather in December

December, the first month of the winter, in Fontana, is also an enjoyable month, with average temperature varying between 60.8°F (16°C) and 44.2°F (6.8°C).

Temperature

December is the coldest month, with an average high-temperature of 60.8°F (16°C) and an average low-temperature of 44.2°F (6.8°C).

Humidity

The average relative humidity in December is 51%.

Rainfall

In December, in Fontana, the rain falls for 5.9 days. Throughout December, 1.5" (38mm) of precipitation is accumulated. Throughout the year, there are 48.1 rainfall days, and 6.89" (175mm) of precipitation is accumulated.

Snowfall

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

Daylight

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

Sunshine

With an average of 6.9h of sunshine, December has the least sunshine of the year.

UV index

The month with the lowest UV index in Fontana is December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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 Fontana?

The coldest month in Fontana, California, is December, with an average high-temperature of 60.8°F (16°C) and an average low-temperature of 44.2°F (6.8°C).

What is the temperature in December in Fontana?

In December, in Fontana, California, the average high-temperature is 60.8°F (16°C), and the average low-temperature is 44.2°F (6.8°C).

What is the average humidity in December in Fontana?

In December, the average relative humidity is 51%.

How many days does it rain in December in Fontana?

In Fontana, during December, the rain falls for 5.9 days and regularly aggregates up to 1.5" (38mm) of precipitation.

When it does not snow in Fontana?

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

What is the month with the shortest days in Fontana?

With an average of 9.9h of daylight, December has the shortest days of the year.

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

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

What is the month with the least sunshine in Fontana?

December has the least sunshine of the year, with an average of 6.9h of sunshine.

How many hours of sunshine does Fontana have in December?

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

When is the lowest UV index in Fontana?

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

What is the UV index reading in December in Fontana?

The average daily maximum UV index in December in Fontana is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in December
Fontana, CA

Average temperature in December - Fontana, CA
  • Average high temperature in December: 60.8°F

The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is December (60.8°F).

  • Average low temperature in December: 44.2°F

The month with the highest average low temperature is August (67.3°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure in December
Fontana, CA

Average pressure in December - Fontana, 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
Fontana, CA

Average wind speed in December - Fontana, CA
  • Average wind speed in December: 5.3mph

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in December
Fontana, CA

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

Months with the highest relative humidity are February, March and May (52%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in December
Fontana, CA

Average rainfall in December - Fontana, CA
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is February (1.57").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
Fontana, CA

Average rainfall days in December - Fontana, CA
  • Average rainfall days in December: 5.9 days

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).

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Average snowfall days in December
Fontana, CA

Average snowfall days in December - Fontana, 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
Fontana, CA

Average daylight in December / Average sunshine in December - Fontana, 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

Months with the most sunshine are June, July and August (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.9h).

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Average sunshine days in December
Fontana, CA

Average sunshine days in December - Fontana, CA
  • Average sunshine days in December: 23.8 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in December
Fontana, CA

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

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

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Average cloud cover in December
Fontana, CA

Average cloud cover in December - Fontana, 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
Fontana, CA

Average visibility in December - Fontana, 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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