December weather forecast
Cathan, WA

Share

Weather in December

The first month of the winter, December, is still a cold month in Cathan, Washington, with an average temperature fluctuating between 41.7°F (5.4°C) and 34°F (1.1°C).

Temperature

December, characterized by an average high temperature of 41.7°F (5.4°C) and a low temperature of 34°F (1.1°C), is generally the coldest month.

Humidity

January, February, November and December, with an average relative humidity of 85%, are the most humid months.

Rainfall

In Cathan, in December, during 19.4 rainfall days, 4.53" (115mm) of precipitation is typically accumulated. In Cathan, during the entire year, the rain falls for 188.6 days and collects up to 34.92" (887mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Cathan, in December, snow falls for 2 days, with typically accumulated 0.67" (17mm) of snow. In Cathan, during the entire year, snow falls for 11.6 days and aggregates up to 9.61" (244mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 24min of daylight.
On the first day of December, sunrise is at 7:39 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:25 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 4.1h of sunshine.

UV index

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. It's recommended to limit sun exposure when its radiation is at its peak during midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Updated: Jul 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

Cathan's December weather reaches an average high of 41.7°F (5.4°C) and an average low of 34°F (1.1°C), making it the coldest month.

Is it cold during December?

An average high-temperature, in December, in Cathan, is 41.7°F (5.4°C) and the average low-temperature is 34°F (1.1°C).

What is the most humid month?

January, February, November and December, with an average relative humidity of 85%, are most humid months.

What is the average humidity in December?

The average relative humidity in December is 85%.

How much does it rain in December?

In Cathan, in December, it is raining for 19.4 days, with typically 4.53" (115mm) of accumulated precipitation.

How many days does it snow in December?

In Cathan, during December, snow falls for 2 days and regularly aggregates up to 0.67" (17mm) of snow.

What is the month with the shortest days?

With an average of 8h and 24min of daylight, December has the shortest days of the year.

How many hours of daylight does Cathan have in December?

In Cathan, the average day length in December is 8h and 26min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:39 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:25 pm PST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 4.1h of sunshine.

How long on average sun shines in December?

In December, the average sunshine duration is 4.1h.

What are the months with the lowest UV index in Cathan?

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

What is the UV index reading in December?

In Cathan, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from 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
Cathan, WA

Average temperature in December - Cathan, WA
  • Average high temperature in December: 41.7°F

The warmest month (with the highest average high temperature) is August (72.3°F).
The month with the lowest average high temperature is December (41.7°F).

  • Average low temperature in December: 34°F

The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is February (33.8°F).

Average pressure in December
Cathan, WA

Average pressure in December - Cathan, WA
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in December
Cathan, WA

Average wind speed in December - Cathan, WA
  • Average wind speed in December: 5.3mph

The windiest months (with the highest average wind speed) are January and November (5.6mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).

Average humidity in December
Cathan, WA

Average humidity in December - Cathan, WA
  • Average humidity in December: 85%

The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is July (73%).

Average rainfall in December
Cathan, WA

Average rainfall in December - Cathan, WA
  • Average rainfall in December: 4.53"

The wettest month (with the highest rainfall) is November (4.92").
The driest month (with the least rainfall) is July (0.51").

Average rainfall days in December
Cathan, WA

Average rainfall days in December - Cathan, WA
  • Average rainfall days in December: 19.4 days

The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (6.9 days).

Average snowfall in December
Cathan, WA

Average snowfall in December - Cathan, WA
  • Average snowfall in December: 0.67"

The month with the highest snowfall is February (4.45").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Cathan, WA

Average snowfall days in December - Cathan, WA
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is February (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Cathan, WA
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).

Average sunshine days in December
Cathan, WA

Average sunshine days in December - Cathan, WA
  • Average sunshine days in December: 9.5 days

The month with the most sunshine days is August (22 days).
The month with the least sunshine days is March (8.1 days).

Average UV index in December
Cathan, WA

Average UV index in December - Cathan, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

Average cloud cover in December
Cathan, WA

Average cloud cover in December - Cathan, WA
  • Average cloud cover in December: 57

The month with the most cloud cover is December (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 26).

Average visibility in December
Cathan, WA

Average visibility in December - Cathan, WA
  • Average visibility in December: 5mi

The months with the highest visibility are March, April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, November and December (5mi).

Cathan, Washington, USA

Weather forecast for your location

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