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 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 that records the lowest temperatures, with averages ranging from a high of 52.9°F (11.6°C) to a low of 40.1°F (4.5°C).Humidity
In December, the average relative humidity in Petrolia is 81%.Rainfall
The month with the most rainfall in Petrolia is December, when the rain falls for 14.8 days and typically aggregates up to 4.96" (126mm) of precipitation.Snowfall
January, March through December are months without snowfall.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:21 am and sunset at 4:51 pm. On the last day of December, sunrise is at 7:39 am and sunset at 5:01 pm PST.
Sunshine
December has the least sunshine of the year in Petrolia, with an average of 5h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Petrolia. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 3 during December leads to these advisories:
Heed the precautions - Suggestions to avoid sunburn are made. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. During bright days, sunglasses that offer UVA and UVB defense are recommended. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Petrolia?
What are the temperatures in Petrolia in December?
What is the average humidity in December in Petrolia?
What is the wettest month in Petrolia?
How many days does it rain in December in Petrolia?
When it does not snow in Petrolia?
What is the month with the shortest days in Petrolia?
What is the average length of the day in December in Petrolia?
When are sunrise and sunset in December in Petrolia?
What is the month with the least sunshine in Petrolia?
How many hours of sunshine does Petrolia have in December?
What are the months with the lowest UV index in Petrolia?
What is the UV index reading in December in Petrolia?
Average temperature in December
Petrolia, CA
- Average high temperature in December: 52.9°F
The warmest month (with the highest average high temperature) is August (74.1°F).
The month with the lowest average high temperature is December (52.9°F).
- Average low temperature in December: 40.1°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is February (39.7°F).
Average pressure in December
Petrolia, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are August and September (29.96"Hg).
Average wind speed in December
Petrolia, CA
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is June (7.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in December
Petrolia, CA
- Average humidity in December: 81%
The month with the highest relative humidity is March (83%).
The month with the lowest relative humidity is September (73%).
Average rainfall in December
Petrolia, CA
- Average rainfall in December: 4.96"
The wettest month (with the highest rainfall) is December (4.96").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in December
Petrolia, CA
- Average rainfall days in December: 14.8 days
The month with the highest number of rainy days is March (17.3 days).
The months with the least rainy days are July and August (1.8 days).
Average snowfall in December
Petrolia, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Petrolia, CA
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Petrolia, CA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 0min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in December
Petrolia, CA
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (11.9 days).
Average UV index in December
Petrolia, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in December
Petrolia, CA
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in December
Petrolia, CA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, September, October, November and December (6mi).
The months with the lowest visibility are May, July and August (5mi).
Petrolia, California, USA
Weather forecast for your location
2. Allow the app to use your location