December weather forecast
North Fontana, CA

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Weather in December

December, the first month of the winter in North Fontana, is still a refreshing month, with an average temperature fluctuating between 60.8°F (16°C) and 44.2°F (6.8°C).

Temperature

December is North Fontana's coldest month, registering average high temperatures of 60.8°F (16°C) and lows of 44.2°F (6.8°C).

Humidity

In December, the average relative humidity is 51%.

Rainfall

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

Snowfall

January, March through December are months without snowfall.

Daylight

With an average of 9h and 54min of daylight, December has the shortest days of the year in North Fontana.
On the first day of December in North Fontana, sunrise is at 6:38 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:50 pm PST.

Sunshine

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

UV index

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 3 in December translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months in North Fontana?

In North Fontana, December is the coldest month, with temperatures averaging a high of 60.8°F (16°C) and a low of 44.2°F (6.8°C).

What are the temperatures in North Fontana in December?

North Fontana in December has an average high-temperature of 60.8°F (16°C) and an average low-temperature of 44.2°F (6.8°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in September is calculated to be 89.6°F (32°C).

What is the average humidity in December in North Fontana?

The average relative humidity in December in North Fontana, California, is 51%.

How many days does it rain in December in North Fontana?

In North Fontana, in December, it is raining for 5.9 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow in North Fontana?

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

What is the month with the shortest days in North Fontana?

With an average of 9h and 54min of daylight, December has the shortest days of the year.

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

The average day length in December in North Fontana, California, is 9h and 55min.

When are sunrise and sunset in December in North Fontana?

In December, on the first day of the month, sunrise is at 6:38 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:50 pm PST.

What is the month with the least sunshine in North Fontana?

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

How many hours of sunshine does North Fontana have in December?

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

What is the month with the lowest UV index in North Fontana?

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

What is the UV index intensity in December in North Fontana?

In North Fontana, California, the average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
North Fontana, CA

Average temperature in December - North 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).

Average pressure in December
North Fontana, CA

Average pressure in December - North Fontana, 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
North Fontana, CA

Average wind speed in December - North 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).

Average humidity in December
North Fontana, CA

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

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

Average rainfall in December
North Fontana, CA

Average rainfall in December - North 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").

Average rainfall days in December
North Fontana, CA

Average rainfall days in December - North 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).

Average snowfall days in December
North Fontana, CA

Average snowfall days in December - North Fontana, CA
  • Average snowfall days in December: 0 days

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

Average daylight in December / Average sunshine in December - North Fontana, CA
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 6h and 5min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

Average sunshine days in December
North Fontana, CA

Average sunshine days in December - North 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).

Average UV index in December
North Fontana, CA

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

The 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).

Average cloud cover in December
North Fontana, CA

Average cloud cover in December - North Fontana, CA
  • Average cloud cover in December: 21

The 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).

Average visibility in December
North Fontana, CA

Average visibility in December - North Fontana, 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).

North Fontana, California, USA

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