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
In Sumpter, the lowest temperatures are generally noted in December, averaging a high of 30.7°F (-0.7°C) and a low of 18.5°F (-7.5°C).Humidity
The average relative humidity in December is 86%.Rainfall
December is the month with the most rainfall in Sumpter. Rain falls for 8.6 days and accumulates 1.77" (45mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. The month with the most snowfall in Sumpter is December, when snow falls for 14.7 days and typically aggregates up to 10.59" (269mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 54min of daylight.On the first day of December in Sumpter, sunrise is at 7:10 am and sunset at 4:13 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:22 pm PST.
Sunshine
In December, the average sunshine in Sumpter, Oregon, is 5.1h.UV index
In Sumpter, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 2 suggests this advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Around midday, solar radiation is most harmful; hence, exposure should be limited. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Frequently asked questions
What month is the coldest in Sumpter?
How cold is December in Sumpter?
What is the average humidity in December in Sumpter?
What is the wettest month in Sumpter?
How much does it rain in Sumpter in December?
What is the snowiest month in Sumpter?
How many days does it snow in December in Sumpter?
What is the month with the shortest days in Sumpter?
How many hours of daylight does Sumpter have in December?
When are sunrise and sunset in December in Sumpter?
How long on average sun shines in December in Sumpter?
What is the UV index reading in December in Sumpter?
Average temperature in December
Sumpter, OR
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (30.7°F).
- Average low temperature in December: 18.5°F
The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).
Average pressure in December
Sumpter, OR
- Average pressure in December: 30.19"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in December
Sumpter, OR
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (5.4mph).
Average humidity in December
Sumpter, OR
- Average humidity in December: 86%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (40%).
Average rainfall in December
Sumpter, OR
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in December
Sumpter, OR
- Average rainfall days in December: 8.6 days
The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is August (4.4 days).
Average snowfall in December
Sumpter, OR
- Average snowfall in December: 10.59"
The month with the highest snowfall is December (10.59").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sumpter, OR
- Average snowfall days in December: 14.7 days
The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Sumpter, 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: 5h and 1min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Sumpter, OR
- Average sunshine days in December: 13.9 days
The month with the most sunshine days is July (22.7 days).
The months with the least sunshine days are February and March (11.3 days).
Average UV index in December
Sumpter, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Sumpter, OR
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in December
Sumpter, OR
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Sumpter, Oregon, USA
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