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, with an average high of 62.1°F (16.7°C) and a low of 46.2°F (7.9°C), signifies the coldest month of the year.Humidity
The average relative humidity in December is 52%.Rainfall
The month with the most rainfall is December, when the rain falls for 5.8 days and typically aggregates up to 1.54" (39mm) of precipitation.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 6:40 am and sunset at 4:42 pm. On the last day of December, sunrise is at 6:57 am and sunset at 4:53 pm PST.
Sunshine
January, February and December, with an average of 6.9h of sunshine, are months with the least sunshine.UV index
December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 3 during December translates into the following directions:
Exercise prevention - Precautions against solar damage are endorsed. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. 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 time of the year is the coldest?
What is the average December temperature?
What is the average humidity in December?
What is the rainiest month?
How many days does it rain in December?
What is the month with the shortest days?
How many hours of daylight does Sierra Madre have in December?
When are sunrise and sunset in December?
What are the months with the least sunshine?
How many hours of sunshine does Sierra Madre have in December?
What is the month with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Sierra Madre, CA
- Average high temperature in December: 62.1°F
The warmest month (with the highest average high temperature) is August (88.2°F).
The month with the lowest average high temperature is December (62.1°F).
- Average low temperature in December: 46.2°F
The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (46.2°F).
Average pressure in December
Sierra Madre, CA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Sierra Madre, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in December
Sierra Madre, CA
- Average humidity in December: 52%
The months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).
Average rainfall in December
Sierra Madre, CA
- Average rainfall in December: 1.54"
The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Sierra Madre, CA
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.3 days).
Average daylight in December /
Average sunshine in December
Sierra Madre, 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 January, February and December (Average sunshine: 6h and 54min).
Average sunshine days in December
Sierra Madre, CA
- Average sunshine days in December: 23.8 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is February (22 days).
Average UV index in December
Sierra Madre, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Sierra Madre, CA
- Average cloud cover in December: 22
The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in December
Sierra Madre, 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).
Sierra Madre, California, USA
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