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
December, with an average high of 45.5°F (7.5°C) and a low of 39.7°F (4.3°C), signifies the coldest month of the year.Humidity
The most humid month is December, with an average relative humidity of 85%.Rainfall
The month with the most rainfall in Copalis Crossing is December, when the rain falls for 18.5 days and typically aggregates up to 3.35" (85mm) of precipitation.Snowfall
April through October and December are months without snowfall in Copalis Crossing, Washington.Daylight
The month with the shortest days in Copalis Crossing, Washington, is December, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:42 am and sunset at 4:28 pm. On the last day of December, in Copalis Crossing, Washington, sunrise is at 8:02 am and sunset at 4:36 pm PST.
Sunshine
The average sunshine in December in Copalis Crossing, Washington, is 3.6h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Copalis Crossing, Washington. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: A maximum UV index of 2 in December translates into the following recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the 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. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
What are the coldest months in Copalis Crossing?
What are December temperatures in Copalis Crossing?
What is the most humid month in Copalis Crossing?
What is the average humidity in December in Copalis Crossing?
What is the wettest month in Copalis Crossing?
How many days does it rain in December in Copalis Crossing?
When it does not snow in Copalis Crossing?
Does it snow in Copalis Crossing in December?
What is the month with the shortest days in Copalis Crossing?
How many hours of daylight does Copalis Crossing have in December?
When are sunrise and sunset in December in Copalis Crossing?
How many hours of sunshine does Copalis Crossing have in December?
When is the lowest UV index in Copalis Crossing?
What is the UV index reading in December in Copalis Crossing?
Average temperature in December
Copalis Crossing, WA
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is August (65.8°F).
The month with the lowest average high temperature is December (45.5°F).
- Average low temperature in December: 39.7°F
The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is December (39.7°F).
Average pressure in December
Copalis Crossing, WA
- Average pressure in December: 30.04"Hg
The month with the highest atmospheric pressure is July (30.08"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in December
Copalis Crossing, WA
- Average wind speed in December: 10.1mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is September (7.1mph).
Average humidity in December
Copalis Crossing, WA
- Average humidity in December: 85%
The month with the highest relative humidity is December (85%).
The months with the lowest relative humidity are April, May and June (81%).
Average rainfall in December
Copalis Crossing, WA
- Average rainfall in December: 3.35"
The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Copalis Crossing, WA
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is December (18.5 days).
The month with the least rainy days is July (5.6 days).
Average snowfall in December
Copalis Crossing, WA
- Average snowfall in December: 0"
The month with the highest snowfall is February (1.02").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in December
Copalis Crossing, WA
- Average snowfall days in December: 0.3 days
The month with the highest number of snowfall days is February (1.6 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
Copalis Crossing, WA
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Copalis Crossing, WA
- Average sunshine days in December: 10.7 days
The month with the most sunshine days is July (23.8 days).
The month with the least sunshine days is December (10.7 days).
Average UV index in December
Copalis Crossing, WA
- Average UV index in December: 2
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Copalis Crossing, WA
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Copalis Crossing, WA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Copalis Crossing, Washington, USA
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