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
Temperature readings reach their annual highs in December, averaging 40.5°F (4.7°C) and a minimum average of 32.5°F (0.3°C).Humidity
In Hamilton, Washington, the average relative humidity in December is 85%.Rainfall
In December, in Hamilton, Washington, the rain falls for 20.6 days. Throughout December, 6.06" (154mm) of precipitation is accumulated. Throughout the year, in Hamilton, there are 203.2 rainfall days, and 49.72" (1263mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In December, in Hamilton, it is snowing for 2.1 days. Throughout December, 1.1" (28mm) of snow is accumulated. In Hamilton, during the entire year, snow falls for 12 days and aggregates up to 12.32" (313mm) of snow.Daylight
With an average of 8h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:39 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:22 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 3.5h of sunshine.UV index
The months with the lowest UV index in Hamilton, Washington, are January through March, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 2 during December translates into the following directions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Hamilton?
How cold does it get in Hamilton in December?
What is the average humidity in December in Hamilton?
How much does it rain in Hamilton in December?
How many days does it snow in December in Hamilton?
What is the month with the shortest days in Hamilton?
What is the average length of the day in December in Hamilton?
When is the sunrise / sunset in December in Hamilton?
What is the month with the least sunshine in Hamilton?
How long on average sun shines in December in Hamilton?
When is the lowest UV index in Hamilton?
How high is the UV index in December in Hamilton?
Average temperature in December
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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
Hamilton, 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).
Hamilton, Washington, USA
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