December weather forecast and climate
North Cucamonga, CA

Weather in December

The first month of the winter, December, is still a comfortable month in North Cucamonga, California, with average temperature varying between 45.3°F (7.4°C) and 61.7°F (16.5°C).

Temperature

December is the coldest month, with an average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 45.3°F (7.4°C).

Humidity

In December, the average relative humidity in North Cucamonga, California, is 51%.

Rainfall

In North Cucamonga, California, in December, during 5.5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In North Cucamonga, California, during the entire year, the rain falls for 42.3 days and collects up to 4.53" (115mm) of precipitation.

Snowfall

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

Daylight

December has the shortest days of the year, 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

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 threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 North Cucamonga?

The coldest month in North Cucamonga is December, with an average high-temperature of 61.7°F (16.5°C) and an average low-temperature of 45.3°F (7.4°C).

What is the temperature in December in North Cucamonga?

In December, the average high-temperature is 61.7°F (16.5°C), and the average low-temperature is 45.3°F (7.4°C).

What is the average humidity in December in North Cucamonga?

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

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

In North Cucamonga, in December, it is raining for 5.5 days, with typically 0.91" (23mm) of accumulated precipitation.

When it does not snow in North Cucamonga?

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

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

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

How many hours of daylight does North Cucamonga have in December?

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

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

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

How long on average sun shines in December in North Cucamonga?

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

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

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

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

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

Average temperature in December
North Cucamonga, CA

Average temperature in December - North Cucamonga, CA
  • Average high temperature in December: 61.7°F

The warmest month (with the highest average high temperature) is August (91.8°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in December: 45.3°F

The month with the highest average low temperature is August (66.6°F).
The coldest months (with the lowest average low temperature) are February and December (45.3°F).

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Average pressure in December
North Cucamonga, CA

Average pressure in December - North Cucamonga, 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 (29.86").

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Average wind speed in December
North Cucamonga, CA

Average wind speed in December - North Cucamonga, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is May (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

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Average humidity in December
North Cucamonga, CA

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

Months with the highest relative humidity are February, March and May (53%).
The month with the lowest relative humidity is August (41%).

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Average rainfall in December
North Cucamonga, CA

Average rainfall in December - North Cucamonga, CA
  • Average rainfall in December: 0.91"

The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in December
North Cucamonga, CA

Average rainfall days in December - North Cucamonga, CA
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (0.9 days).

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Average snowfall days in December
North Cucamonga, CA

Average snowfall days in December - North Cucamonga, 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
North Cucamonga, CA

Average daylight in December / Average sunshine in December - North Cucamonga, 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: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.9).

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Average sunshine days in December
North Cucamonga, CA

Average sunshine days in December - North Cucamonga, CA
  • Average sunshine days in December: 24.4 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (22.8 days).

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Average UV index in December
North Cucamonga, CA

Average UV index in December - North Cucamonga, 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
North Cucamonga, CA

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

Months with the most cloud cover are February and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in December
North Cucamonga, CA

Average visibility in December - North Cucamonga, 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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