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 Winthrop, the month of December is known for its lowest average temperatures, reaching a high of 27.5°F (-2.5°C) and 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
January through April, September through December are months with snowfall. 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
In Winthrop, the average sunshine in December is 4.5h.UV index
The average daily maximum UV index in December in Winthrop is 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the maximum UV index of 2 suggests this advice:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What part of the year is the coldest in Winthrop?
How cold is December in Winthrop?
What is the average humidity in December in Winthrop?
What is the wettest month in Winthrop?
How many days does it rain in December in Winthrop?
What is the snowiest month in Winthrop?
How much does it snow in Winthrop in December?
What is the month with the shortest days in Winthrop?
What is the average length of the day in December in Winthrop?
What time are sunrise and sunset in December in Winthrop?
How many hours of sunshine does Winthrop have in December?
How high is the UV index in December in Winthrop?
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 2min
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 3min
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).
Winthrop, Washington, USA
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