December weather forecastLummi Island, WA
December
Weather in December
The first month of the winter, December, is also a wintry month in Lummi Island, Washington, with an average temperature varying between 41.9°F (5.5°C) and 35.4°F (1.9°C).Temperature
In Lummi Island, December is the coldest month, with temperatures averaging a high of 41.9°F (5.5°C) and a low of 35.4°F (1.9°C).Humidity
In December, the average relative humidity is 82%.Rainfall
In December, the rain falls for 18.3 days. Throughout December, 4.76" (121mm) of precipitation is accumulated. Throughout the year, there are 178.6 rainfall days, and 37.32" (948mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Lummi Island, in December, snow falls for 1.8 days, with typically accumulated 0.59" (15mm) of snow. In Lummi Island, during the entire year, snow falls for 10.7 days and aggregates up to 6.57" (167mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 24min of daylight.On the first day of the month, sunrise is at 7:43 am and sunset at 4:16 pm. On the last day of December, sunrise is at 8:03 am and sunset at 4:24 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 4.2h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 2 during December translates into the following guidance:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. To guard against the harmful effects of the Sun, minimize exposure during midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lummi Island, WA
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is August (71.1°F).
The month with the lowest average high temperature is December (41.9°F).
- Average low temperature in December: 35.4°F
The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is February (35.2°F).
Average pressure in December
Lummi Island, WA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).
Average wind speed in December
Lummi Island, WA
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in December
Lummi Island, WA
- Average humidity in December: 82%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is July (74%).
Average rainfall in December
Lummi Island, WA
- Average rainfall in December: 4.76"
The wettest month (with the highest rainfall) is November (5.71").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in December
Lummi Island, WA
- Average rainfall days in December: 18.3 days
The month with the highest number of rainy days is November (20.1 days).
The month with the least rainy days is August (7.3 days).
Average snowfall in December
Lummi Island, WA
- Average snowfall in December: 0.59"
The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Lummi Island, WA
- Average snowfall days in December: 1.8 days
The month with the highest number of snowfall days is February (3.8 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
Lummi Island, WA
- Average daylight in December: 8h and 24min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in December: 4h and 12min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).
Average sunshine days in December
Lummi Island, WA
- Average sunshine days in December: 11.2 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is November (8.5 days).
Average UV index in December
Lummi Island, 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
Lummi Island, WA
- Average cloud cover in December: 56
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Lummi Island, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
