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 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 of the year, registering average temperatures as high as 63.5°F (17.5°C) and as low as 46.9°F (8.3°C).Humidity
In Norco, the average relative humidity in December is 53%.Rainfall
The month with the most rainfall is December, when the rain falls for 6.5 days and typically aggregates up to 1.89" (48mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of December in Norco, sunrise is at 6:37 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:51 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 6.7h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 4 in December transforms into this advice:
Guard yourself - An obligation to protect skin and eyes from harm exists. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
What are the temperatures in December?
What is the average humidity in December?
What is the wettest month?
How many days does it rain in December?
What is the month with the shortest days?
How many hours of daylight does Norco have in December?
When is the sunrise / sunset in December in Norco?
What is the month with the least sunshine in Norco?
How long on average sun shines in December in Norco?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Norco, CA
- Average high temperature in December: 63.5°F
The warmest month (with the highest average high temperature) is August (89.4°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in December: 46.9°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).
Average pressure in December
Norco, 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 (29.87"Hg).
Average wind speed in December
Norco, CA
- Average wind speed in December: 4.9mph
The windiest months (with the highest average wind speed) are April and May (5.4mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).
Average humidity in December
Norco, CA
- Average humidity in December: 53%
The month with the highest relative humidity is May (60%).
The month with the lowest relative humidity is November (48%).
Average rainfall in December
Norco, CA
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is December (1.89").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Norco, CA
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is March (8.2 days).
The month with the least rainy days is June (1.3 days).
Average daylight in December /
Average sunshine in December
Norco, 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 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Norco, CA
- Average sunshine days in December: 23 days
The month with the most sunshine days is June (27.1 days).
The month with the least sunshine days is February (20.8 days).
Average UV index in December
Norco, CA
- Average UV index in December: 4
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Norco, CA
- Average cloud cover in December: 23
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Norco, 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).
Norco, California, USA
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