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 sea temperature 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
The coldest temperatures occur during January, when averages reach a peak of 36.9°F (2.7°C) and a low of 27.7°F (-2.4°C).Humidity
In January, the average relative humidity is 75%.Rainfall
In January, the rain falls for 9 days. Throughout January, 2.8" (71mm) of precipitation is accumulated. In Onset, during the entire year, the rain falls for 157.4 days and collects up to 32.2" (818mm) of precipitation.Snowfall
January through April, October through December are months with snowfall. In Onset, in January, snow falls for 6 days, with typically accumulated 1.57" (40mm) of snow. Throughout the year, there are 21.7 snowfall days, and 8.43" (214mm) of snow is accumulated.Ocean temperature
In Onset, in January, the average water temperature is 41.4°F (5.2°C).Note: With an efficient thermal swimsuit, one can navigate 41.4°F (5.2°C) even if it's colder than 50°F (10°C); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 55.4°F (13°C) feels chilly.
Daylight
In Onset, the average length of the day in January is 9h and 34min.On the first day of the month, sunrise is at 7:09 am and sunset at 4:22 pm. On the last day of January, sunrise is at 6:55 am and sunset at 4:56 pm EST.
Sunshine
The average sunshine in January is 5.1h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 2 in January transforms into the following instructions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Avoiding the Sun during its peak radiation time around midday is a healthy practice. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is January?
What is the average humidity in January in Onset?
How much does it rain in January?
How many days does it snow in January?
What is the ocean temperature in January?
How many hours of daylight does Onset have in January?
When are sunrise and sunset in January?
How long on average sun shines in January?
When is the lowest UV index?
How high is the UV index in January in Onset?
Average temperature in January
Onset, MA
- Average high temperature in January: 36.9°F
The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (36.9°F).
- Average low temperature in January: 27.7°F
The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure in January
Onset, MA
- Average pressure in January: 30"Hg
The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Onset, MA
- Average wind speed in January: 13.7mph
The windiest month (with the highest average wind speed) is January (13.7mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).
Average humidity in January
Onset, MA
- Average humidity in January: 75%
The months with the highest relative humidity are June and July (81%).
The months with the lowest relative humidity are March and November (74%).
Average rainfall in January
Onset, MA
- Average rainfall in January: 2.8"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in January
Onset, MA
- Average rainfall days in January: 9 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (9 days).
Average snowfall in January
Onset, MA
- Average snowfall in January: 1.57"
The months with the highest snowfall are February and March (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in January
Onset, MA
- Average snowfall days in January: 6 days
The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature in January
Onset, MA
- Average sea temperature in January: 41.3°F
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight in January /
Average sunshine in January
Onset, MA
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
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 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in January
Onset, MA
- Average sunshine days in January: 15.8 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is April (12.5 days).
Average UV index in January
Onset, MA
- Average UV index in January: 2
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in January
Onset, MA
- Average cloud cover in January: 46
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in January
Onset, MA
- 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).
Onset, Massachusetts, USA
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