December weather forecast
Rancho Cucamonga, CA

Weather in December

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

Temperature

The coldest month 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).

Humidity

In December, the average relative humidity is 51%.

Rainfall

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

Daylight

With an average of 9h and 56min of daylight, December has the shortest days of the year in Rancho Cucamonga.
On the first day of the month, sunrise is at 6:38 am and sunset at 4:40 pm. On the last day of December, sunrise is at 6:55 am and sunset at 4:51 pm PST.

Sunshine

February and December, with an average of 6.9h of sunshine, are months with the least sunshine in Rancho Cucamonga, California.

UV index

December is the month with the lowest UV index in Rancho Cucamonga, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 3 in December transform into the following instructions:
Take precautions - Protection against 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 Rancho Cucamonga?

The coldest month in Rancho Cucamonga, California, 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 average humidity in December in Rancho Cucamonga?

The average relative humidity in December in Rancho Cucamonga, California, is 51%.

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

In December, in Rancho Cucamonga, California, the rain falls for 5.5 days. Throughout December, 0.91" (23mm) of precipitation is accumulated.

When it does not snow in Rancho Cucamonga?

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

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

December has the shortest days of the year in Rancho Cucamonga, California, with an average of 9h and 56min of daylight.

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

In December, the average day length in Rancho Cucamonga is 9h and 56min.

When are sunrise and sunset in December in Rancho Cucamonga?

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, in Rancho Cucamonga, California, sunrise is at 6:55 am and sunset at 4:51 pm PST.

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

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

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

In Rancho Cucamonga, California, the average sunshine duration in December is 6.9h.

When is the lowest UV index in Rancho Cucamonga?

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

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

The average daily maximum UV index in December in Rancho Cucamonga is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Rancho Cucamonga, CA

Average temperature in December - Rancho 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
Rancho Cucamonga, CA

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

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Average wind speed in December
Rancho Cucamonga, CA

Average wind speed in December - Rancho 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
Rancho Cucamonga, CA

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

The 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
Rancho Cucamonga, CA

Average rainfall in December - Rancho 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
Rancho Cucamonga, CA

Average rainfall days in December - Rancho 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
Rancho Cucamonga, CA

Average snowfall days in December - Rancho Cucamonga, 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).

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Average daylight in December /
Average sunshine in December
Rancho Cucamonga, CA

Average daylight in December / Average sunshine in December - Rancho Cucamonga, CA
  • Average daylight in December: 9h and 56min

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in December: 6h and 54min

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

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Average sunshine days in December
Rancho Cucamonga, CA

Average sunshine days in December - Rancho 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
Rancho Cucamonga, CA

Average UV index in December - Rancho Cucamonga, 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).

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Average cloud cover in December
Rancho Cucamonga, CA

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

The 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
Rancho Cucamonga, CA

Average visibility in December - Rancho Cucamonga, 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).

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