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

January weather forecast and climate
Jamestown, RI

January, like December, in Jamestown, Rhode Island, is a wintry winter month, with temperature in the range of an average low of 26.4°F (-3.1°C) and an average high of 36.1°F (2.3°C).

Temperature

January is the coldest month, with an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 26.4°F (-3.1°C).

Humidity

The average relative humidity in Jamestown, Rhode Island, is 75%.

Rainfall

In Jamestown, in January, during 8.3 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. Throughout the year, there are 148.1 rainfall days, and 29.65" (753mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, May, November and December. In January, in Jamestown, Rhode Island, it is snowing for 6.6 days. Throughout January, 2.01" (51mm) of snow is accumulated. Throughout the year, there are 22.9 snowfall days, and 8.78" (223mm) of snow is accumulated.

Ocean temperature

In Jamestown, Rhode Island, the average water temperature is 41.5°F (5.3°C).
Note: Swimming in 41.5°F (5.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day in January is 9.6h.

Sunshine

In Jamestown, the average sunshine in January is 5.2h.

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 reading of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in January transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in Jamestown?

January is the coldest month in Jamestown, Rhode Island, with an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 26.4°F (-3.1°C).

What is the temperature in January in Jamestown?

In January, the average high-temperature is 36.1°F (2.3°C), and the average low-temperature is 26.4°F (-3.1°C).

What is the average humidity in January in Jamestown?

In Jamestown, the average relative humidity in January is 75%.

How much does it rain in Jamestown in January?

In January, in Jamestown, the rain falls for 8.3 days. Throughout January, 2.6" (66mm) of precipitation is accumulated.

How many days does it snow in January in Jamestown?

In Jamestown, Rhode Island, in January, during 6.6 snowfall days, 2.01" (51mm) of snow is typically accumulated.

What is the ocean temperature in January in Jamestown?

In Jamestown, Rhode Island, in January, the average water temperature is 41.5°F (5.3°C). Swimming in 41.5°F (5.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

In January, the average length of the day is 9.6h.

How many hours of sunshine does Jamestown have in January?

The average sunshine in January is 5.2h.

What are the months with the lowest UV index in Jamestown?

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

How high is the UV index in January in Jamestown?

In Jamestown, Rhode Island, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV rays.
Average temperature in January - Jamestown, RI
  • Average high temperature in January: 36.1°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 January: 26.4°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 January - Jamestown, RI
  • Average humidity in January: 75%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is March (73%).

Average rainfall in January - Jamestown, RI
  • Average rainfall in January: 2.6"

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 January - Jamestown, RI
  • Average rainfall days in January: 8.3 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 January - Jamestown, RI
  • Average snowfall in January: 2.01"

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 January - Jamestown, RI
  • Average snowfall days in January: 6.6 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 January - Jamestown, RI
  • Average sea temperature in January: 41.5°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 January / Average sunshine in January - Jamestown, RI
  • Average daylight in January: 9.6h

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 January: 5.2h

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 January - Jamestown, RI
  • Average UV index in January: 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).