January weather forecastJamestown, RI
January
Weather in January
When January arrives in Jamestown, Rhode Island, residents prepare for the arrival of winter's cold bite. Often shrouded in dense cloud cover, accounting for an average of 45% of the month, the city assumes a grey hue, creating a serene ambiance. Despite this, daylight hours are scarce, resulting in shorter days and prolonged periods of darkness. Winds whip through the streets at an average speed of 12.1mph (19.5km/h), growing to gusts of 18.8mph (30.3km/h), while the mercury dips to a chilly 26.4°F (-3.1°C), making it one of the coldest months on record. January signifies the start of a new year, with the weather mirroring this transition, swapping December's festive chill for the deep freeze of true winter.Temperature
January, with its average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 26.4°F (-3.1°C), holds the record as the coldest month.Humidity
The average relative humidity in January is 75%.Rainfall
In January, in Jamestown, the rain falls for 8.3 days. Throughout January, 2.6" (66mm) of precipitation is accumulated. Throughout the year, in Jamestown, there are 148.1 rainfall days, and 29.65" (753mm) of precipitation is accumulated.Snowfall
Months with snowfall in Jamestown are January through March, May, November and December. In Jamestown, Rhode Island, in January, snow falls for 6.6 days, with typically accumulated 2.01" (51mm) of snow. In Jamestown, during the entire year, snow falls for 22.9 days and aggregates up to 8.78" (223mm) of snow.Ocean temperature
In Jamestown, the average seawater temperature in January is 41.5°F (5.3°C).Note: Unprotected swimming in 41.5°F (5.3°C) is dangerous due to potential cold shock. Especially when temperatures go below 50°F (10°C), leading to hyperventilation.
Daylight
In Jamestown, the average length of the day in January is 9h and 35min.On the first day of the month, sunrise is at 7:11 am and sunset at 4:26 pm. On the last day of January, sunrise is at 6:58 am and sunset at 4:59 pm EST.
Sunshine
In Jamestown, the average sunshine in January is 5.2h.UV index
The months with the lowest UV index are January through March and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The average daily UV index of 2 in January transforms into the following instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 pressure in January
Jamestown, RI
- Average pressure in January: 30.01"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 January
Jamestown, RI
- Average wind speed in January: 12.1mph
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 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 least 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 least 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").
The months with the least 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).
The months with the least 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: 9h and 36min
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 January: 5h and 12min
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 January
Jamestown, RI
- Average sunshine days in January: 15.6 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 January
Jamestown, RI
- Average UV index in January: 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 January
Jamestown, RI
- Average cloud cover in January: 45
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 January
Jamestown, RI
- Average visibility in January: 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).
