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, on average, is the coldest month, registering a high temperature of 46°F (7.8°C) and a low of 33.8°F (1°C).Humidity
The months with the highest humidity are January through March and December, with an average relative humidity of 86%.Rainfall
The month with the most rainfall in Pleasant Hill is December, when the rain falls for 18.5 days and typically aggregates up to 4.57" (116mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, it is snowing for 0.8 days. Throughout December, 0.43" (11mm) of snow is accumulated. Throughout the year, there are 6.6 snowfall days, and 5" (127mm) of snow is accumulated.Daylight
The month with the shortest days in Pleasant Hill is December, with an average of 9h and 0min of daylight.On the first day of December in Pleasant Hill, sunrise is at 7:27 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 4:44 pm PST.
Sunshine
In Pleasant Hill, the average sunshine in December is 4.2h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Pleasant Hill. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Frequently asked questions
What are the coldest months in Pleasant Hill?
What are the temperatures in Pleasant Hill in December?
What is the most humid month in Pleasant Hill?
What is the average humidity in December in Pleasant Hill?
What is the rainiest month in Pleasant Hill?
How many days does it rain in December in Pleasant Hill?
How much does it snow in Pleasant Hill in December?
What is the month with the shortest days in Pleasant Hill?
How many hours of daylight does Pleasant Hill have in December?
When is the sunrise / sunset in December in Pleasant Hill?
How long on average sun shines in December in Pleasant Hill?
What are the months with the lowest UV index in Pleasant Hill?
What is the UV index reading in December in Pleasant Hill?
Average temperature in December
Pleasant Hill, OR
- Average high temperature in December: 46°F
The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (46°F).
- Average low temperature in December: 33.8°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (33.8°F).
Average pressure in December
Pleasant Hill, OR
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in December
Pleasant Hill, OR
- Average wind speed in December: 4.3mph
The windiest months (with the highest average wind speed) are January and March (4.4mph).
The calmest months (with the lowest average wind speed) are August and September (3.5mph).
Average humidity in December
Pleasant Hill, OR
- Average humidity in December: 86%
The months with the highest relative humidity are January, February, March and December (86%).
The month with the lowest relative humidity is August (69%).
Average rainfall in December
Pleasant Hill, OR
- Average rainfall in December: 4.57"
The wettest month (with the highest rainfall) is December (4.57").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in December
Pleasant Hill, OR
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in December
Pleasant Hill, OR
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (2.72").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Pleasant Hill, OR
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is February (2.5 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
Pleasant Hill, OR
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in December
Pleasant Hill, OR
- Average sunshine days in December: 11.2 days
The month with the most sunshine days is August (25.6 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in December
Pleasant Hill, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Pleasant Hill, OR
- Average cloud cover in December: 57
The month with the most cloud cover is March (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in December
Pleasant Hill, OR
- Average visibility in December: 4mi
The months with the highest visibility are June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, November and December (4mi).
Pleasant Hill, Oregon, USA
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