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 stands out as Lyman's coldest month, with temperatures ranging between an average high of 40.5°F (4.7°C) and a low of 32.5°F (0.3°C).Humidity
In Lyman, the average relative humidity in December is 85%.Rainfall
In Lyman, in December, during 20.6 rainfall days, 6.06" (154mm) of precipitation is typically accumulated. In Lyman, during the entire year, the rain falls for 203.2 days and collects up to 49.72" (1263mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 2.1 days. Throughout December, 1.1" (28mm) of snow is accumulated. Throughout the year, there are 12 snowfall days, and 12.32" (313mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 24min of daylight.On the first day of the month, sunrise is at 7:39 am and sunset at 4:15 pm. On the last day of December, sunrise is at 8:00 am and sunset at 4:23 pm PST.
Sunshine
December has the least sunshine of the year in Lyman, with an average of 3.5h of sunshine.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Lyman. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 in December translates into these instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold does it get in December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Lyman have in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Lyman, WA
- Average high temperature in December: 40.5°F
The warmest month (with the highest average high temperature) is July (70.9°F).
The month with the lowest average high temperature is December (40.5°F).
- Average low temperature in December: 32.5°F
The month with the highest average low temperature is August (50.5°F).
The coldest months (with the lowest average low temperature) are February and December (32.5°F).
Average pressure in December
Lyman, 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
Lyman, WA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is November (5.7mph).
The calmest month (with the lowest average wind speed) is August (3.3mph).
Average humidity in December
Lyman, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January, February and March (86%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Lyman, WA
- Average rainfall in December: 6.06"
The wettest month (with the highest rainfall) is November (7.09").
The driest month (with the least rainfall) is July (0.98").
Average rainfall days in December
Lyman, WA
- Average rainfall days in December: 20.6 days
The month with the highest number of rainy days is March (22.1 days).
The month with the least rainy days is August (9.4 days).
Average snowfall in December
Lyman, WA
- Average snowfall in December: 1.1"
The month with the highest snowfall is February (4.96").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Lyman, WA
- Average snowfall days in December: 2.1 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
Lyman, WA
- Average daylight in December: 8h and 2min
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: 3h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in December
Lyman, WA
- Average sunshine days in December: 9 days
The month with the most sunshine days is August (19.2 days).
The month with the least sunshine days is March (7.3 days).
Average UV index in December
Lyman, 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, March, October, November and December (UV index 2).
Average cloud cover in December
Lyman, WA
- Average cloud cover in December: 62
The month with the most cloud cover is December (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Lyman, WA
- Average visibility in December: 5mi
The months with the highest visibility are June, July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (5mi).
Lyman, Washington, USA
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