December weather forecastCathlamet, WA
December
Weather in December
The first month of the winter, December, is still a cold month in Cathlamet, Washington, with an average temperature varying between 32.9°F (0.5°C) and 42.3°F (5.7°C).Temperature
Temperature records mark December as the coldest month, with highs averaging 42.3°F (5.7°C) and lows at 32.9°F (0.5°C).Humidity
The months with the highest humidity in Cathlamet are February, November and December, with an average relative humidity of 89%.Rainfall
In December, the rain falls for 13.6 days. Throughout December, 1.46" (37mm) of precipitation is accumulated. Throughout the year, in Cathlamet, there are 141.6 rainfall days, and 11.57" (294mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows in Cathlamet. Throughout December, in the average 0.5 snowfall days, it receives 0.04" (1mm) of snow. In Cathlamet, during the entire year, snow falls for 4.6 days and aggregates up to 1.54" (39mm) of snow.Daylight
December has the shortest days of the year in Cathlamet, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:36 am and sunset at 4:29 pm. On the last day of December, in Cathlamet, Washington, sunrise is at 7:56 am and sunset at 4:37 pm PST.
Sunshine
In December, the average sunshine is 3.3h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Cathlamet. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, an average UV index of 2 transforms into the following instructions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Experience reduced UV exposure by about half when donning a wide-brim hat. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Cathlamet, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in December
Cathlamet, WA
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and December (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.02"Hg).
Average wind speed in December
Cathlamet, WA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is September (3.8mph).
Average humidity in December
Cathlamet, WA
- Average humidity in December: 89%
The months with the highest relative humidity are February, November and December (89%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Cathlamet, WA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is January (1.77").
The driest month (with the least rainfall) is August (0.24").
Average rainfall days in December
Cathlamet, WA
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is March (16.3 days).
The month with the least rainy days is August (4.7 days).
Average snowfall in December
Cathlamet, WA
- Average snowfall in December: 0.04"
The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Cathlamet, WA
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Cathlamet, WA
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 3h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 3h and 12min).
Average sunshine days in December
Cathlamet, WA
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is August (24.6 days).
The month with the least sunshine days is April (11.7 days).
Average UV index in December
Cathlamet, WA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Cathlamet, WA
- Average cloud cover in December: 66
The months with the most cloud cover are February and March (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 42).
Average visibility in December
Cathlamet, WA
- Average visibility in December: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
