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 when Deer Island sees the lowest average temperatures, with a high of 42.6°F (5.9°C) and a low of 32.9°F (0.5°C).Humidity
In Deer Island, the average relative humidity in December is 86%.Rainfall
In Deer Island, during December, the rain falls for 19.5 days and regularly aggregates up to 5.24" (133mm) of precipitation. Throughout the year, in Deer Island, there are 180.2 rainfall days, and 36.77" (934mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In Deer Island, in December, during 0.8 snowfall days, 0.31" (8mm) of snow is typically accumulated. In Deer Island, Oregon, during the entire year, snow falls for 7.6 days and aggregates up to 5.79" (147mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:33 am and sunset at 4:28 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:36 pm PST.
Sunshine
The average sunshine in December is 3.8h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: An average maximum UV index of 2 in December leads to these recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How many hours of sunshine does Deer Island have in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Deer Island, OR
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in December
Deer Island, 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
Deer Island, OR
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in December
Deer Island, OR
- Average humidity in December: 86%
The months with the highest relative humidity are February and November (87%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall in December
Deer Island, OR
- Average rainfall in December: 5.24"
The wettest month (with the highest rainfall) is January (5.43").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Deer Island, OR
- Average rainfall days in December: 19.5 days
The month with the highest number of rainy days is March (21 days).
The month with the least rainy days is July (5.2 days).
Average snowfall in December
Deer Island, OR
- Average snowfall in December: 0.31"
The month with the highest snowfall is January (2.01").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Deer Island, OR
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is February (2.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Deer Island, OR
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).
Average sunshine days in December
Deer Island, OR
- Average sunshine days in December: 10.4 days
The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is February (8.3 days).
Average UV index in December
Deer Island, 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
Deer Island, OR
- Average cloud cover in December: 61
The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Deer Island, OR
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Deer Island, Oregon, USA
Weather forecast for your location
2. Allow the app to use your location