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 month when Montclair sees the lowest average temperatures, with a high of 62.1°F (16.7°C) and a low of 45.5°F (7.5°C).Humidity
In Montclair, the average relative humidity in December is 51%.Rainfall
In Montclair, in December, during 6.4 rainfall days, 1.69" (43mm) of precipitation is typically accumulated. Throughout the year, there are 49.6 rainfall days, and 7.8" (198mm) of precipitation is accumulated.Snowfall
In Montclair, snow does not fall in January, March through December.Daylight
With an average of 9h and 54min of daylight, December has the shortest days of the year in Montclair.On the first day of the month, sunrise is at 6:38 am and sunset at 4:41 pm. On the last day of December, sunrise is at 6:56 am and sunset at 4:52 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 estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 3 during December, leads to the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Frequently asked questions
What part of the year is the coldest in Montclair?
What is the average December temperature in Montclair?
What is the average humidity in December in Montclair?
How many days does it rain in December in Montclair?
When it does not snow in Montclair?
What is the month with the shortest days in Montclair?
How many hours of daylight does Montclair have in December?
What time are sunrise and sunset in December in Montclair?
What are the months with the least sunshine in Montclair?
How many hours of sunshine does Montclair have in December?
What is the month with the lowest UV index in Montclair?
What is the UV index intensity in December in Montclair?
Average temperature in December
Montclair, CA
- Average high temperature in December: 62.1°F
The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is December (62.1°F).
- Average low temperature in December: 45.5°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 (45.5°F).
Average pressure in December
Montclair, 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
Montclair, CA
- Average wind speed in December: 5.2mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in December
Montclair, CA
- Average humidity in December: 51%
The months with the highest relative humidity are March and May (54%).
The month with the lowest relative humidity is August (42%).
Average rainfall in December
Montclair, CA
- Average rainfall in December: 1.69"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Montclair, CA
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.2 days).
Average snowfall days in December
Montclair, 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
Montclair, 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
Montclair, CA
- Average sunshine days in December: 23.2 days
The month with the most sunshine days is June (28.2 days).
The month with the least sunshine days is February (21.5 days).
Average UV index in December
Montclair, 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
Montclair, CA
- Average cloud cover in December: 21
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Montclair, 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).
Montclair, California, USA
Weather forecast for your location
2. Allow the app to use your location
