December weather forecast
Chelan Falls, WA

englishespañol中文
Share

Weather in December

The first month of the winter, December, is still a freezing cold month in Chelan Falls, Washington, with an average temperature fluctuating between 19°F (-7.2°C) and 30.2°F (-1°C).

Temperature

December, on average, is the coldest month, registering a high temperature of 30.2°F (-1°C) and a low of 19°F (-7.2°C).

Humidity

In December, the average relative humidity is 88%.

Rainfall

December is the month with the most rainfall in Chelan Falls. Rain falls for 7.5 days and accumulates 1.65" (42mm) of precipitation.

Snowfall

January through April, September through December are months with snowfall. The month with the most snowfall is December, when snow falls for 11.9 days and typically aggregates up to 9.06" (230mm) of snow.

Daylight

With an average of 8h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:28 am and sunset at 4:09 pm. On the last day of December, sunrise is at 7:48 am and sunset at 4:17 pm PST.

Sunshine

In December, the average sunshine is 4.5h.

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.

Frequently asked questions

What part of the year is the coldest?

December, with its high-temperature average of 30.2°F (-1°C) and a low-temperature average of 19°F (-7.2°C), is the coldest month.

How cold is December in Chelan Falls?

In December, the average high-temperature and low-temperature are 30.2°F (-1°C) and 19°F (-7.2°C) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in August is estimated at 82.4°F (28°C).

What is the average humidity in December?

In December, the average relative humidity is 88%.

What is the wettest month in Chelan Falls?

The month with the most rainfall is December, when the rain falls for 7.5 days and typically aggregates up to 1.65" (42mm) of precipitation.

How much does it rain in December?

In Chelan Falls, in December, during 7.5 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

When does it snow the most?

The month with the most snowfall is December, when snow falls for 11.9 days and typically aggregates up to 9.06" (230mm) of snow.

How many days does it snow in December?

In December, it is snowing for 11.9 days. Throughout December, 9.06" (230mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 30min of daylight.

What is the average length of the day in December?

In December, the average day length is 8h and 29min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:28 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:48 am and sunset at 4:17 pm PST.

How long on average sun shines in December in Chelan Falls?

The average sunshine duration in December is 4.5h.

What is the month with the lowest UV index?

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.

How high is the UV index in December in Chelan Falls?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
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
Chelan Falls, WA

Average temperature in December - Chelan Falls, WA
  • Average high temperature in December: 30.2°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (30.2°F).

  • Average low temperature in December: 19°F

The month with the highest average low temperature is August (55.8°F).
The coldest months (with the lowest average low temperature) are January and December (19°F).

Average pressure in December
Chelan Falls, WA

Average pressure in December - Chelan Falls, WA
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

Average wind speed in December
Chelan Falls, WA

Average wind speed in December - Chelan Falls, WA
  • Average wind speed in December: 3.5mph

The windiest month (with the highest average wind speed) is June (6.1mph).
The calmest months (with the lowest average wind speed) are January and December (3.5mph).

Average humidity in December
Chelan Falls, WA

Average humidity in December - Chelan Falls, WA
  • Average humidity in December: 88%

The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (43%).

Average rainfall in December
Chelan Falls, WA

Average rainfall in December - Chelan Falls, WA
  • Average rainfall in December: 1.65"

The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is July (0.16").

Average rainfall days in December
Chelan Falls, WA

Average rainfall days in December - Chelan Falls, WA
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (3.8 days).

Average snowfall in December
Chelan Falls, WA

Average snowfall in December - Chelan Falls, WA
  • Average snowfall in December: 9.06"

The month with the highest snowfall is December (9.06").
The months with the least snowfall are May, June, July and August (0").

Average snowfall days in December
Chelan Falls, WA

Average snowfall days in December - Chelan Falls, WA
  • Average snowfall days in December: 11.9 days

The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Chelan Falls, WA

Average daylight in December / Average sunshine in December - Chelan Falls, WA
  • Average daylight in December: 8h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in December: 4h and 3min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in December
Chelan Falls, WA

Average sunshine days in December - Chelan Falls, WA
  • Average sunshine days in December: 15.2 days

The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (13.2 days).

Average UV index in December
Chelan Falls, WA

Average UV index in December - Chelan Falls, 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, March, October, November and December (UV index 2).

Average cloud cover in December
Chelan Falls, WA

Average cloud cover in December - Chelan Falls, WA
  • Average cloud cover in December: 52

The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).

Average visibility in December
Chelan Falls, WA

Average visibility in December - Chelan Falls, WA
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Chelan Falls, Washington, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location