December weather forecast
Winthrop, WA

A mirror view in the blue water of Blue Lake of the trees and rock cliffs nearby, in Winthrop, Washington
A mirror view in the blue water of Blue Lake of the trees and rock cliffs nearby, in Winthrop, Washington

Weather in December

The first month of the winter, December, is still a freezing cold month in Winthrop, Washington, with an average temperature varying between 13.5°F (-10.3°C) and 27.5°F (-2.5°C).

Temperature

With an average high-temperature of 27.5°F (-2.5°C) and an average low-temperature of 13.5°F (-10.3°C), December is the coldest month.

Humidity

In Winthrop, 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, Washington, are January through April, September through December. December is the month with the most snowfall in Winthrop. 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 23min of daylight.
On the first day of the month, sunrise is at 7:31 am and sunset at 4:08 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:15 pm PST.

Sunshine

In Winthrop, Washington, the average sunshine in December is 4.5h.

UV index

In Winthrop, Washington, 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 ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Winthrop?

The coldest month in Winthrop is December, with an average high-temperature of 27.5°F (-2.5°C) and an average low-temperature of 13.5°F (-10.3°C).

What is the temperature in December in Winthrop?

In December, the average high-temperature is 27.5°F (-2.5°C), and the average low-temperature is 13.5°F (-10.3°C).

What is the average humidity in December in Winthrop?

In December, the average relative humidity in Winthrop is 91%.

What is the wettest month in Winthrop?

The month with the most rainfall in Winthrop, Washington, is December, when the rain falls for 10.1 days and typically aggregates up to 2.48" (63mm) of precipitation.

How many days does it rain in December in Winthrop?

In December, in Winthrop, the rain falls for 10.1 days. Throughout December, 2.48" (63mm) of precipitation is accumulated.

What is the snowiest month in Winthrop?

December is the month with the most snowfall in Winthrop, Washington. Snow falls for 15.3 days and accumulates 12.87" (327mm) of snow.

How much does it snow in Winthrop in December?

In Winthrop, Washington, in December, snow falls for 15.3 days, with typically accumulated 12.87" (327mm) of snow.

What is the month with the shortest days in Winthrop?

The month with the shortest days in Winthrop is December, with an average of 8h and 23min of daylight.

What is the average length of the day in December in Winthrop?

The average day length in December is 8h and 23min.

When is the sunrise / sunset in December in Winthrop?

On the first day of December in Winthrop, sunrise is at 7:31 am and sunset at 4:08 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 4:15 pm PST.

How long on average sun shines in December in Winthrop?

The average sunshine duration in December is 4.5h.

How high is the UV index in December in Winthrop?

The average daily maximum UV index in December in Winthrop is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Winthrop, WA

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).

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Average pressure in December
Winthrop, WA

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).

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Average wind speed in December
Winthrop, WA

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).

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Average humidity in December
Winthrop, WA

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%).

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Average rainfall in December
Winthrop, WA

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").

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Average rainfall days in December
Winthrop, WA

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).

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Average snowfall in December
Winthrop, WA

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").

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Average snowfall days in December
Winthrop, WA

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).

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Average daylight in December /
Average sunshine in December
Winthrop, WA

Average daylight in December / Average sunshine in December - Winthrop, WA
  • Average daylight in December: 8h and 23min

The month with the longest days is June (Average daylight: 16h and 3min).
The month with the shortest days is December (Average daylight: 8h and 23min).

  • 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).

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Average sunshine days in December
Winthrop, WA

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).

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Average UV index in December
Winthrop, WA

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).

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Average cloud cover in December
Winthrop, WA

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).

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Average visibility in December
Winthrop, WA

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).

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