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 38.7°F (3.7°C) and an average low of 28.6°F (-1.9°C).Humidity
The average relative humidity in December in Umatilla, Oregon, is 77%.Rainfall
In Umatilla, during December, the rain falls for 11.5 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Umatilla, during the entire year, the rain falls for 106.1 days and collects up to 7.76" (197mm) of precipitation.Snowfall
Months with snowfall are January through March, September, November and December. In Umatilla, in December, snow falls for 3.2 days, with typically accumulated 1.22" (31mm) of snow. In Umatilla, Oregon, during the entire year, snow falls for 10.3 days and aggregates up to 6.02" (153mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:19 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 4:22 pm PST.
Sunshine
January and December, with an average of 5.4h of sunshine, are months with the least sunshine.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 minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. When the Sun is at its strongest around midday, find shade and limit exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
What is the coldest time of year in Umatilla?
How cold is it in Umatilla in December?
What is the average humidity in December in Umatilla?
How many days does it rain in December in Umatilla?
How many days does it snow in December in Umatilla?
What is the month with the shortest days in Umatilla?
What is the average length of the day in December in Umatilla?
When is the sunrise / sunset in December in Umatilla?
What is the month with the least sunshine in Umatilla?
How many hours of sunshine does Umatilla have in December?
What are the months with the lowest UV index in Umatilla?
How high is the UV index in December in Umatilla?
Average temperature in December
Umatilla, OR
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (38.7°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in December
Umatilla, OR
- Average pressure in December: 30.16"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Umatilla, OR
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is December (6.2mph).
Average humidity in December
Umatilla, OR
- Average humidity in December: 77%
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (36%).
Average rainfall in December
Umatilla, OR
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is March (1.02").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Umatilla, OR
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is March (13.1 days).
The month with the least rainy days is July (3.8 days).
Average snowfall in December
Umatilla, OR
- Average snowfall in December: 1.22"
The month with the highest snowfall is February (2.83").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in December
Umatilla, OR
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is December (3.2 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Umatilla, 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: 5h and 2min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in December
Umatilla, OR
- Average sunshine days in December: 15.8 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is February (14 days).
Average UV index in December
Umatilla, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Umatilla, OR
- Average cloud cover in December: 44
The months with the most cloud cover are January and December (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Umatilla, OR
- 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).
Umatilla, Oregon, USA
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