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 proves to be the coldest month, recording an average maximum temperature of 38.3°F (3.5°C) and a minimum temperature of 30.4°F (-0.9°C).Humidity
In January, the average relative humidity is 75%.Rainfall
In January, in Hyannis, Massachusetts, the rain falls for 10.8 days. Throughout January, 2.87" (73mm) of precipitation is accumulated. Throughout the year, there are 157.2 rainfall days, and 31.77" (807mm) of precipitation is accumulated.Snowfall
January through April and December are months with snowfall. In Hyannis, in January, during 6.4 snowfall days, 1.42" (36mm) of snow is typically accumulated. Throughout the year, there are 24.1 snowfall days, and 6.1" (155mm) of snow is accumulated.Ocean temperature
In Hyannis, Massachusetts, the average seawater temperature in January is 41.5°F (5.3°C).Note: Swimming in 41.5°F (5.3°C) poses a severe threat. Even short exposure to 55.4°F (13°C) is chilling, and going below 50°F (10°C) can cause breathing irregularities and intense cold shock, based on one's stamina.
Daylight
In Hyannis, the average length of the day in January is 9h and 34min.On the first day of January, sunrise is at 7:07 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 4:54 pm EST.
Sunshine
The average sunshine in January is 4.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Hyannis. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily high UV index of 2 in January leads to these guidelines:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
Is January cold?
What is the average humidity in January?
How much does it rain in January?
How much does it snow in January?
What is the ocean temperature in January?
What is the average length of the day in January?
When are sunrise and sunset in January?
How many hours of sunshine does Hyannis have in January?
What are the months with the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Hyannis, MA
- Average high temperature in January: 38.3°F
The warmest month (with the highest average high temperature) is August (72.5°F).
The month with the lowest average high temperature is January (38.3°F).
- Average low temperature in January: 30.4°F
The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (30.4°F).
Average pressure in January
Hyannis, 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
Hyannis, MA
- Average wind speed in January: 16.5mph
The windiest month (with the highest average wind speed) is January (16.5mph).
The calmest month (with the lowest average wind speed) is August (10.6mph).
Average humidity in January
Hyannis, MA
- Average humidity in January: 75%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is November (74%).
Average rainfall in January
Hyannis, MA
- Average rainfall in January: 2.87"
The wettest month (with the highest rainfall) is October (3.7").
The driest month (with the least rainfall) is August (1.73").
Average rainfall days in January
Hyannis, MA
- Average rainfall days in January: 10.8 days
The month with the highest number of rainy days is April (15.8 days).
The month with the least rainy days is February (10.3 days).
Average snowfall in January
Hyannis, MA
- Average snowfall in January: 1.42"
The month with the highest snowfall is March (1.93").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in January
Hyannis, MA
- Average snowfall days in January: 6.4 days
The month with the highest number of snowfall days is February (7.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in January
Hyannis, MA
- Average sea temperature in January: 41.5°F
The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).
Average daylight in January /
Average sunshine in January
Hyannis, MA
- 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: 4h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in January
Hyannis, MA
- Average sunshine days in January: 12.8 days
The month with the most sunshine days is August (17.7 days).
The month with the least sunshine days is February (11.4 days).
Average UV index in January
Hyannis, 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
Hyannis, MA
- Average cloud cover in January: 48
The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in January
Hyannis, 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).
Hyannis, Massachusetts, USA
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