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 sea temperature 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
During the shift to December, Jamestown records a mild decrease in average high-temperature, moving from a cool 51.1°F (10.6°C) in November to a cold 42.4°F (5.8°C). Throughout December, Jamestown records an average temperature of 33.1°F (0.6°C) at night.Humidity
In Jamestown, the average relative humidity in December is 75%.Rainfall
In Jamestown, in December, it is raining for 11.5 days, with typically 3.23" (82mm) of accumulated precipitation. Throughout the year, there are 148.1 rainfall days, and 29.65" (753mm) of precipitation is accumulated.Snowfall
January through March, May, November and December are months with snowfall in Jamestown. In Jamestown, Rhode Island, in December, snow falls for 3.8 days, with typically accumulated 1.38" (35mm) of snow. Throughout the year, in Jamestown, there are 22.9 snowfall days, and 8.78" (223mm) of snow is accumulated.Ocean temperature
In December, the average ocean temperature in Jamestown is 48°F (8.9°C).Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.
Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Jamestown, Rhode Island.On the first day of the month, sunrise is at 6:53 am and sunset at 4:16 pm. On the last day of December, in Jamestown, Rhode Island, sunrise is at 7:11 am and sunset at 4:25 pm EST.
Sunshine
In Jamestown, the average sunshine in December is 4.9h.UV index
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Jamestown. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 2 in December translates into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in Jamestown?
What is the average humidity in December in Jamestown?
How much does it rain in Jamestown in December?
How much does it snow in Jamestown in December?
How cold is the water in December in Jamestown?
What is the month with the shortest days in Jamestown?
How many hours of daylight does Jamestown have in December?
When are sunrise and sunset in December in Jamestown?
How many hours of sunshine does Jamestown have in December?
When is the lowest UV index in Jamestown?
What is the UV index intensity in December in Jamestown?
Average temperature in December
Jamestown, RI
- Average high temperature in December: 42.4°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in December
Jamestown, RI
- Average pressure in December: 30.03"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Jamestown, RI
- Average wind speed in December: 11.6mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).
Average humidity in December
Jamestown, RI
- Average humidity in December: 75%
The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).
Average rainfall in December
Jamestown, RI
- Average rainfall in December: 3.23"
The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is September (1.42").
Average rainfall days in December
Jamestown, RI
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is April (15.6 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Jamestown, RI
- Average snowfall in December: 1.38"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, June, July, August, September and October (0").
Average snowfall days in December
Jamestown, RI
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is January (6.6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in December
Jamestown, RI
- Average sea temperature in December: 48.1°F
The best month for swimming (with the highest average sea temperature) is August (69.6°F).
The coldest month (with the lowest average sea temperature) is February (38.1°F).
Average daylight in December /
Average sunshine in December
Jamestown, RI
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Jamestown, RI
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is April (12.3 days).
Average UV index in December
Jamestown, RI
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in December
Jamestown, RI
- Average cloud cover in December: 47
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Jamestown, RI
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Jamestown, Rhode Island, USA
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