Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
With an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 26.4°F (-3.1°C), January is the coldest month.Humidity
In Portsmouth, the average relative humidity in January is 75%.Rainfall
In Portsmouth, in January, during 8.3 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Portsmouth, during the entire year, the rain falls for 148.1 days and collects up to 29.65" (753mm) of precipitation.Snowfall
January through March, May, November and December are months with snowfall. In Portsmouth, during January, snow falls for 6.6 days and regularly aggregates up to 2.01" (51mm) of snow. In Portsmouth, during the entire year, snow falls for 22.9 days and aggregates up to 8.78" (223mm) of snow.Daylight
In January, the average length of the day is 9h and 34min.On the first day of the month, sunrise is at 7:11 am and sunset at 4:25 pm. On the last day of January, sunrise is at 6:57 am and sunset at 4:58 pm EST.
Sunshine
In January, the average sunshine 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. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 2 during January translates into the following directions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is it in January?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
What is the average length of the day in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Portsmouth have in January?
What is the month with the lowest UV index in Portsmouth?
What is the UV index reading in January?
Average temperature in January
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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 daylight in January /
Average sunshine in January
Portsmouth, RI
- Average daylight in January: 9h and 4min
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 1min
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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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
Portsmouth, 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).
Portsmouth, Rhode Island, USA
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