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 coldest month, with the temperature often reaching an average high of 44.2°F (6.8°C) and an average low of 34.2°F (1.2°C).Humidity
The months with the highest humidity are February and December, with an average relative humidity of 88%.Rainfall
The month with the most rainfall is December, when the rain falls for 16.5 days and typically aggregates up to 1.54" (39mm) of precipitation.Snowfall
January through March and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 0.6 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 4.5 snowfall days, and 0.91" (23mm) of snow is accumulated.Daylight
With an average of 8h and 54min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:31 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:42 pm PST.
Sunshine
The average sunshine in December is 4.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Monmouth. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
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 December?
What are the most humid months?
What is the average humidity in December?
What is the rainiest month?
How many days does it rain in December?
When does it start to snow?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Monmouth have in December?
When is the lowest UV index in Monmouth?
What is the UV index intensity in December?
Average temperature in December
Monmouth, OR
- Average high temperature in December: 44.2°F
The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in December
Monmouth, OR
- Average pressure in December: 30.09"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
Monmouth, OR
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in December
Monmouth, OR
- Average humidity in December: 88%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is August (68%).
Average rainfall in December
Monmouth, OR
- 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 July (0.12").
Average rainfall days in December
Monmouth, OR
- Average rainfall days in December: 16.5 days
The month with the highest number of rainy days is March (17.8 days).
The month with the least rainy days is August (4 days).
Average snowfall in December
Monmouth, OR
- Average snowfall in December: 0.12"
The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Monmouth, OR
- Average snowfall days in December: 0.6 days
The month with the highest number of snowfall days is February (1.8 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
Monmouth, OR
- Average daylight in December: 8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 4h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in December
Monmouth, OR
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is March (9.7 days).
Average UV index in December
Monmouth, OR
- Average UV index in December: 2
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, November and December (UV index 2).
Average cloud cover in December
Monmouth, OR
- Average cloud cover in December: 59
The months with the most cloud cover are February and March (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in December
Monmouth, OR
- Average visibility in December: 4mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
Monmouth, Oregon, USA
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