December weather forecastOnion Creek, WA
December
Weather in December
December, the first month of the winter in Onion Creek, is also a subzero cold month, with an average temperature ranging between max 28.9°F (-1.7°C) and min 16.9°F (-8.4°C).Temperature
Onion Creek records the coldest temperatures in December, averaging a high of 28.9°F (-1.7°C) and a low of 16.9°F (-8.4°C).Humidity
In Onion Creek, the average relative humidity in December is 91%.Rainfall
In Onion Creek, in December, during 11.7 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. Throughout the year, in Onion Creek, Washington, there are 156.3 rainfall days, and 16.18" (411mm) of precipitation is accumulated.Snowfall
January through April, September through December are months with snowfall. In Onion Creek, during December, snow falls for 13.7 days and regularly aggregates up to 6.5" (165mm) of snow. In Onion Creek, during the entire year, snow falls for 53.2 days and aggregates up to 25.16" (639mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 18min of daylight.On the first day of the month, sunrise is at 7:23 am and sunset at 3:57 pm. On the last day of December, sunrise is at 7:44 am and sunset at 4:05 pm PST.
Sunshine
In December, the average sunshine in Onion Creek is 4.3h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 1 in December translates into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. 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
Onion Creek, WA
- Average high temperature in December: 28.9°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (28.9°F).
- Average low temperature in December: 16.9°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is February (16°F).
Average pressure in December
Onion Creek, WA
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in December
Onion Creek, WA
- Average wind speed in December: 3mph
The windiest month (with the highest average wind speed) is April (3.9mph).
The calmest months (with the lowest average wind speed) are January, February and December (3mph).
Average humidity in December
Onion Creek, WA
- Average humidity in December: 91%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (50%).
Average rainfall in December
Onion Creek, WA
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in December
Onion Creek, WA
- Average rainfall days in December: 11.7 days
The month with the highest number of rainy days is March (18.4 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in December
Onion Creek, WA
- Average snowfall in December: 6.5"
The month with the highest snowfall is January (6.61").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in December
Onion Creek, WA
- Average snowfall days in December: 13.7 days
The month with the highest number of snowfall days is December (13.7 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Onion Creek, WA
- Average daylight in December: 8h and 18min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 4h and 18min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Onion Creek, WA
- Average sunshine days in December: 12.3 days
The month with the most sunshine days is August (20.8 days).
The month with the least sunshine days is March (9 days).
Average UV index in December
Onion Creek, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Onion Creek, WA
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in December
Onion Creek, WA
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
