Jamestown
Rhode Island, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Jamestown, RI

December, the first month of the winter, in Jamestown, is still a cold month, with average temperature fluctuating between 42.4°F (5.8°C) and 33.1°F (0.6°C).

Temperature

In Jamestown, the average high-temperature in December marginally drops, from a cool 51.1°F (10.6°C) in November, to a cold 42.4°F (5.8°C). The average low-temperature, in December, is 33.1°F (0.6°C).

Humidity

In December, the average relative humidity is 75%.

Rainfall

In Jamestown, during December, the rain falls for 11.5 days and regularly aggregates up to 3.23" (82mm) of precipitation. In Jamestown, during the entire year, the rain falls for 148.1 days and collects up to 29.65" (753mm) of precipitation.

Snowfall

Months with snowfall are January through March, May, November and December. In Jamestown, during December, snow falls for 3.8 days and regularly aggregates up to 1.38" (35mm) of snow. Throughout the year, there are 22.9 snowfall days, and 8.78" (223mm) of snow is accumulated.

Ocean temperature

In Jamestown, the average water temperature 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

The month with the shortest days is December, with an average of 9.2h of daylight.

Sunshine

The average sunshine is 4.9h.

UV index

Months with the lowest UV index in Jamestown are January through March and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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 Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Jamestown?

In Jamestown, in December, the average high-temperature is 42.4°F (5.8°C), and the average low-temperature is 33.1°F (0.6°C).

What is the average humidity in December in Jamestown?

In December, the average relative humidity in Jamestown, Rhode Island, is 75%.

How many days does it rain in December in Jamestown?

In Jamestown, in December, it is raining for 11.5 days, with typically 3.23" (82mm) of accumulated precipitation.

How many days does it snow in December in Jamestown?

In Jamestown, in December, snow falls for 3.8 days, with typically accumulated 1.38" (35mm) of snow.

How cold is the water in December in Jamestown?

In Jamestown, Rhode Island, the average seawater temperature in December is 48°F (8.9°C). 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.

What is the month with the shortest days in Jamestown?

December has the shortest days of the year, with an average of 9.2h of daylight.

What is the average length of the day in December in Jamestown?

The average length of the day in December in Jamestown, Rhode Island, is 9.2h.

How long on average sun shines in December in Jamestown?

The average sunshine in December is 4.9h.

What is the month with the lowest UV index in Jamestown?

January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Jamestown.

What is the UV index reading in December in Jamestown?

In December, the average daily maximum UV index in Jamestown, Rhode Island, is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to the UV radiation.
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 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 lowest 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 lowest number of 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").
Months with the lowest 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).
Months with the lowest number of 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: 9.2h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.2h).

  • Average sunshine in December: 4.9h

The month with most sunshine is August (Average sunshine: 10.5h).
The month with least sunshine is February (Average sunshine: 4.8h).

Average UV index in December - Jamestown, RI
  • Average UV index in December: 2

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March and December (UV index 2).