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 and February are characterised by lowest temperatures, with an average high of 39°F (3.9°C).Humidity
In Chatham, the average relative humidity in January is 75%.Rainfall
In Chatham, in January, during 9.5 rainfall days, 1.69" (43mm) of precipitation is typically accumulated. Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In January, it is snowing for 6 days. Throughout January, 1.34" (34mm) of snow is accumulated. In Chatham, during the entire year, snow falls for 20.8 days and aggregates up to 4.37" (111mm) of snow.Ocean temperature
In Chatham, Massachusetts, the average seawater temperature in January is 41.9°F (5.5°C).Note: It is advised against swimming in 41.9°F (5.5°C) when it drops below 50°F (10°C). Such temperatures can cause extreme cold shock, leading to hyperventilation.
Daylight
In January, the average length of the day in Chatham is 9h and 34min.On the first day of the month, sunrise is at 7:06 am and sunset at 4:19 pm. On the last day of January, in Chatham, sunrise is at 6:52 am and sunset at 4:53 pm EST.
Sunshine
The average sunshine in January is 4.5h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Chatham. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 2 during January leads to these instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
What part of the year is the coldest in Chatham?
How cold is it in Chatham in January?
What is the average humidity in January in Chatham?
How much does it rain in Chatham in January?
How many days does it snow in January in Chatham?
What is the ocean temperature in January in Chatham?
How many hours of daylight does Chatham have in January?
When is the sunrise / sunset in January in Chatham?
How long on average sun shines in January in Chatham?
What is the month with the lowest UV index in Chatham?
How high is the UV index in January in Chatham?
Average temperature in January
Chatham, MA
- Average high temperature in January: 39°F
The warmest month (with the highest average high temperature) is August (71.6°F).
The months with the lowest average high temperature are January and February (39°F).
- Average low temperature in January: 31.6°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 (31.6°F).
Average pressure in January
Chatham, MA
- Average pressure in January: 29.99"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
Chatham, MA
- Average wind speed in January: 18mph
The windiest month (with the highest average wind speed) is January (18mph).
The calmest month (with the lowest average wind speed) is August (11.4mph).
Average humidity in January
Chatham, MA
- Average humidity in January: 75%
The months with the highest relative humidity are June and July (85%).
The month with the lowest relative humidity is November (74%).
Average rainfall in January
Chatham, MA
- Average rainfall in January: 1.69"
The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is November (1.46").
Average rainfall days in January
Chatham, MA
- Average rainfall days in January: 9.5 days
The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is February (8.3 days).
Average snowfall in January
Chatham, MA
- Average snowfall in January: 1.34"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Chatham, 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, September and October (0 days).
Average sea temperature in January
Chatham, MA
- Average sea temperature in January: 41.9°F
The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is March (39.8°F).
Average daylight in January /
Average sunshine in January
Chatham, 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: 4h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in January
Chatham, MA
- Average sunshine days in January: 13 days
The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is January (13 days).
Average UV index in January
Chatham, 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
Chatham, MA
- Average cloud cover in January: 52
The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in January
Chatham, 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).
Chatham, Massachusetts, USA
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