Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December is the coldest month, with the temperature often reaching an average high of 61.7°F (16.5°C) and an average low of 45.3°F (7.4°C).Humidity
In Rancho Cucamonga, California, the average relative humidity in December is 51%.Rainfall
In Rancho Cucamonga, in December, during 5.5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In Rancho Cucamonga, during the entire year, the rain falls for 42.3 days and collects up to 4.53" (115mm) of precipitation.Snowfall
In Rancho Cucamonga, snow does not fall in January, March through December.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.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, in Rancho Cucamonga, 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, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The daily maximum UV index of 3 in December interprets into the following advice:
Undertake precautions - Guarding against sun damage is counselled. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What is the coldest month in Rancho Cucamonga?
What is the usual temperature for Rancho Cucamonga in December?
What is the average humidity in December in Rancho Cucamonga?
How many days does it rain in December in Rancho Cucamonga?
When it does not snow in Rancho Cucamonga?
What is the month with the shortest days in Rancho Cucamonga?
What is the average length of the day in December in Rancho Cucamonga?
When are sunrise and sunset in December in Rancho Cucamonga?
What is the month with the least sunshine in Rancho Cucamonga?
How many hours of sunshine does Rancho Cucamonga have in December?
When is the lowest UV index in Rancho Cucamonga?
What is the UV index intensity in December in Rancho Cucamonga?
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).
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).
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).
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%).
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").
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).
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).
Average daylight in December /
Average sunshine in December
Rancho Cucamonga, 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 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).
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).
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).
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).
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).
Rancho Cucamonga, California, USA
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