December weather forecastSiletz, OR
December
Weather in December
December, the first month of the winter in Siletz, is still a chilly month, with temperature in the range of an average high of 47.7°F (8.7°C) and an average low of 40.6°F (4.8°C).Temperature
Siletz reaches its lowest average temperatures in December, measuring 47.7°F (8.7°C) at the peak and 40.6°F (4.8°C) at the lowest.Humidity
The months with the highest humidity are February, March, November and December, with an average relative humidity of 83%.Rainfall
December is the month with the most rainfall. Rain falls for 16.5 days and accumulates 3.07" (78mm) of precipitation.Snowfall
March through October and December are months without snowfall in Siletz.Daylight
The month with the shortest days is December, with an average of 8h and 54min of daylight.On the first day of the month, sunrise is at 7:33 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:45 pm PST.
Sunshine
In Siletz, the average sunshine in December is 4.2h.UV index
The months with the lowest UV index in Siletz are February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, an average UV index of 2 transforms 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. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Siletz, OR
- Average high temperature in December: 47.7°F
The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (47.7°F).
- Average low temperature in December: 40.6°F
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (40.6°F).
Average pressure in December
Siletz, OR
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is September (30.02"Hg).
Average wind speed in December
Siletz, OR
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Siletz, OR
- Average humidity in December: 83%
The months with the highest relative humidity are February, March, November and December (83%).
The months with the lowest relative humidity are April, May, July, September and October (81%).
Average rainfall in December
Siletz, OR
- Average rainfall in December: 3.07"
The wettest month (with the highest rainfall) is December (3.07").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in December
Siletz, OR
- Average rainfall days in December: 16.5 days
The month with the highest number of rainy days is March (18.2 days).
The month with the least rainy days is August (3.7 days).
Average snowfall in December
Siletz, OR
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.28").
The months with the least snowfall are March, April, May, June, July, August, September, October and December (0").
Average snowfall days in December
Siletz, OR
- Average snowfall days in December: 0.1 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are March, April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Siletz, OR
- Average daylight in December: 8h and 54min
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 12min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 4h and 0min).
Average sunshine days in December
Siletz, OR
- Average sunshine days in December: 11.8 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is March (10.9 days).
Average UV index in December
Siletz, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in December
Siletz, OR
- Average cloud cover in December: 56
The months with the most cloud cover are February and March (Cloud cover 59).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in December
Siletz, OR
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are August and September (5mi).
