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 brings the lowest temperatures, with an average high of 43.9°F (6.6°C) and an average low of 34°F (1.1°C).Humidity
January, February, November and December, with an average relative humidity of 85%, are the most humid months.Rainfall
In Cornelius, in December, during 18.8 rainfall days, 4.45" (113mm) of precipitation is typically accumulated. Throughout the year, in Cornelius, there are 173 rainfall days, and 29.49" (749mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In Cornelius, during December, snow falls for 0.7 days and regularly aggregates up to 0.35" (9mm) of snow. Throughout the year, there are 6.6 snowfall days, and 4.53" (115mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:32 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 4:38 pm PST.
Sunshine
In December, the average sunshine in Cornelius is 3.9h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
How cold is December?
What are the most humid months in Cornelius?
What is the average humidity in December?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Cornelius have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Cornelius have in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Cornelius, OR
- Average high temperature in December: 43.9°F
The warmest month (with the highest average high temperature) is August (81.5°F).
The month with the lowest average high temperature is December (43.9°F).
- Average low temperature in December: 34°F
The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is December (34°F).
Average pressure in December
Cornelius, OR
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in December
Cornelius, OR
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest months (with the lowest average wind speed) are June, August and September (4.3mph).
Average humidity in December
Cornelius, OR
- Average humidity in December: 85%
The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is August (64%).
Average rainfall in December
Cornelius, OR
- Average rainfall in December: 4.45"
The wettest month (with the highest rainfall) is January (4.57").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in December
Cornelius, OR
- Average rainfall days in December: 18.8 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (4.4 days).
Average snowfall in December
Cornelius, OR
- Average snowfall in December: 0.35"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Cornelius, OR
- Average snowfall days in December: 0.7 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Cornelius, OR
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in December
Cornelius, OR
- Average sunshine days in December: 10.5 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is March (8.5 days).
Average UV index in December
Cornelius, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Cornelius, OR
- Average cloud cover in December: 60
The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Cornelius, OR
- Average visibility in December: 5mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January and February (4mi).
Cornelius, Oregon, USA
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