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, known for its average high temperature of 61.7°F (16.5°C) and an average low temperature of 45.3°F (7.4°C), is the coldest month.Humidity
The average relative humidity in December is 51%.Rainfall
In Rancho Cucamonga, during December, the rain falls for 5.5 days and regularly aggregates up to 0.91" (23mm) of precipitation. Throughout the year, there are 42.3 rainfall days, and 4.53" (115mm) 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.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
The months with the least sunshine are February and December, with an average of 6.9h of sunshine.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 3 during December translates into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. It's recommended to limit sun exposure when its radiation is at its peak during midday. Opt for tightly woven and loose clothing to enhance protection from the Sun.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
What is the average December temperature?
What is the average humidity in December?
How much does it rain in December?
When it does not snow?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What are the months with the least sunshine?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
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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