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
January, characterized by an average high temperature of 36.9°F (2.7°C) and a low temperature of 27.7°F (-2.4°C), is generally the coldest month.Humidity
In Onset, the average relative humidity in January is 75%.Rainfall
In Onset, during January, the rain falls for 9 days and regularly aggregates up to 2.8" (71mm) of precipitation. Throughout the year, there are 157.4 rainfall days, and 32.2" (818mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. In Onset, in January, snow falls for 6 days, with typically accumulated 1.57" (40mm) of snow. Throughout the year, in Onset, 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: Beware of 41.4°F (5.2°C) waters at 55.4°F (13°C), they're uninviting, and a dip below 50°F (10°C) has risks of breath loss and cold shock, contingent on health.
Daylight
In Onset, the average length of the day in January is 9h and 34min.On the first day of January in Onset, Massachusetts, sunrise is at 7:09 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 4:56 pm EST.
Sunshine
In January, the average sunshine 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 minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 2 in January translates into this advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
What time of the year is the coldest in Onset?
How cold is January in Onset?
What is the average humidity in January in Onset?
How much does it rain in Onset in January?
How many days does it snow in January in Onset?
How cold is the water in January in Onset?
What is the average length of the day in January in Onset?
When is the sunrise / sunset in January in Onset?
How many hours of sunshine does Onset have in January?
When is the lowest UV index in Onset?
What is the UV index reading 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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