December weather forecastWinthrop, WA
December
Weather in December
December in Winthrop marks the full onset of winter, bringing the coldest temperatures of the year. The high average is noted at 27.5°F (-2.5°C) while a chilling low average dips to 13.5°F (-10.3°C). The town is typically blanketed with around 12.87" (327mm) of snow, adding to the already existing November snowfall. Light is elusive in December, with an daily average of only 8.4 daylight hours. As residents bid farewell to December, they gear up for January and yet another new year of varying weather conditions.Temperature
In Winthrop, December records the lowest average temperatures, peaking at 27.5°F (-2.5°C) and reaching a low of 13.5°F (-10.3°C).Humidity
The average relative humidity in December is 91%.Rainfall
The month with the most rainfall is December, when the rain falls for 10.1 days and typically aggregates up to 2.48" (63mm) of precipitation.Snowfall
Months with snowfall in Winthrop are January through April, September through December. December is the month with the most snowfall. Snow falls for 15.3 days and accumulates 12.87" (327mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 24min of daylight.On the first day of the month, sunrise is at 7:32 am and sunset at 4:07 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:15 pm PST.
Sunshine
The average sunshine in December is 4.5h.UV index
In Winthrop, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Winthrop, WA
- Average high temperature in December: 27.5°F
The warmest month (with the highest average high temperature) is August (75.9°F).
The month with the lowest average high temperature is December (27.5°F).
- Average low temperature in December: 13.5°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (13.5°F).
Average pressure in December
Winthrop, WA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are June and August (29.95"Hg).
Average wind speed in December
Winthrop, WA
- Average wind speed in December: 3.6mph
The windiest months (with the highest average wind speed) are June and July (5mph).
The calmest months (with the lowest average wind speed) are January and December (3.6mph).
Average humidity in December
Winthrop, WA
- Average humidity in December: 91%
The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in December
Winthrop, WA
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in December
Winthrop, WA
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (6.1 days).
Average snowfall in December
Winthrop, WA
- Average snowfall in December: 12.87"
The month with the highest snowfall is December (12.87").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in December
Winthrop, WA
- Average snowfall days in December: 15.3 days
The month with the highest number of snowfall days is December (15.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Winthrop, WA
- Average daylight in December: 8h and 24min
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 24min).
- Average sunshine in December: 4h and 30min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Winthrop, WA
- Average sunshine days in December: 11.8 days
The month with the most sunshine days is August (23 days).
The month with the least sunshine days is March (8.3 days).
Average UV index in December
Winthrop, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in December
Winthrop, WA
- Average cloud cover in December: 53
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in December
Winthrop, WA
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
