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, on average, is the coldest month, registering a high temperature of 36.5°F (2.5°C) and a low of 24.8°F (-4°C).Humidity
December is the most humid month, with an average relative humidity of 84%.Rainfall
In Sisters, in December, during 13 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Sisters, during the entire year, the rain falls for 142.1 days and collects up to 22.87" (581mm) of precipitation.Snowfall
Months with snowfall in Sisters are January through May, September through December. In Sisters, during December, snow falls for 14.7 days and regularly aggregates up to 10.75" (273mm) of snow. In Sisters, Oregon, during the entire year, snow falls for 70.7 days and aggregates up to 60.04" (1525mm) of snow.Daylight
With an average of 8h and 54min of daylight, December has the shortest days of the year.On the first day of December in Sisters, sunrise is at 7:22 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 4:37 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.1h of sunshine.UV index
In Sisters, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
What month is the coldest in Sisters?
How cold is December in Sisters?
What is the most humid month in Sisters?
What is the average humidity in December in Sisters?
How many days does it rain in December in Sisters?
How many days does it snow in December in Sisters?
What is the month with the shortest days in Sisters?
How many hours of daylight does Sisters have in December?
When is the sunrise / sunset in December in Sisters?
What is the month with the least sunshine in Sisters?
How long on average sun shines in December in Sisters?
How high is the UV index in December in Sisters?
Average temperature in December
Sisters, OR
- Average high temperature in December: 36.5°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in December: 24.8°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).
Average pressure in December
Sisters, OR
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in December
Sisters, OR
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is February (6.1mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).
Average humidity in December
Sisters, OR
- Average humidity in December: 84%
The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in December
Sisters, OR
- Average rainfall in December: 3.15"
The wettest month (with the highest rainfall) is January (3.31").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Sisters, OR
- Average rainfall days in December: 13 days
The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is July (5 days).
Average snowfall in December
Sisters, OR
- Average snowfall in December: 10.75"
The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Sisters, 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
Sisters, 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 July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in December
Sisters, OR
- Average sunshine days in December: 11.1 days
The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is March (8.1 days).
Average UV index in December
Sisters, 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 February (UV index 1).
Average cloud cover in December
Sisters, OR
- Average cloud cover in December: 49
The months with the most cloud cover are January, February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in December
Sisters, OR
- Average visibility in December: 5mi
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, March and December (5mi).
Sisters, Oregon, USA
Weather forecast for your location
2. Allow the app to use your location
