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
In Port Jefferson Station, the month of January registers the lowest temperatures, averaging 37.6°F (3.1°C) at the peak and 29.1°F (-1.6°C) at the lowest.Humidity
In January, the average relative humidity is 72%.Rainfall
The month with the least rainfall is January, when the rain falls for 6.8 days and typically collects 2.05" (52mm) of precipitation.Snowfall
January through March, October through December are months with snowfall. In Port Jefferson Station, during January, snow falls for 3.5 days and regularly aggregates up to 0.94" (24mm) of snow. Throughout the year, there are 12.6 snowfall days, and 5.59" (142mm) of snow is accumulated.Daylight
In January, the average length of the day is 9h and 38min.On the first day of the month, sunrise is at 7:16 am and sunset at 4:34 pm. On the last day of January, in Port Jefferson Station, sunrise is at 7:03 am and sunset at 5:07 pm EST.
Sunshine
In Port Jefferson Station, 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 reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: The UV index of 2 during January leads to these advisories:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Enhance your sun protection with tightly woven, yet airy clothing. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
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 does it get in January?
What is the average humidity in January?
What is the driest month?
How much does it rain in Port Jefferson Station in January?
How much does it snow in January?
How many hours of daylight does Port Jefferson Station have in January?
When are sunrise and sunset in January?
How many hours of sunshine does Port Jefferson Station have in January?
What are the months with the lowest UV index?
How high is the UV index in January?
Average temperature in January
Port Jefferson Station, NY
- Average high temperature in January: 37.6°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in January: 29.1°F
The months with the highest average low temperature are July and August (71.1°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).
Average pressure in January
Port Jefferson Station, NY
- Average pressure in January: 30.04"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in January
Port Jefferson Station, NY
- Average wind speed in January: 12.9mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in January
Port Jefferson Station, NY
- Average humidity in January: 72%
The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).
Average rainfall in January
Port Jefferson Station, NY
- Average rainfall in January: 2.05"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in January
Port Jefferson Station, NY
- Average rainfall days in January: 6.8 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in January
Port Jefferson Station, NY
- Average snowfall in January: 0.94"
The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in January
Port Jefferson Station, NY
- Average snowfall days in January: 3.5 days
The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Port Jefferson Station, NY
- 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 18min).
- Average sunshine in January: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in January
Port Jefferson Station, NY
- Average sunshine days in January: 19.8 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (13 days).
Average UV index in January
Port Jefferson Station, NY
- 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, November and December (UV index 2).
Average cloud cover in January
Port Jefferson Station, NY
- Average cloud cover in January: 45
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in January
Port Jefferson Station, NY
- 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).
Port Jefferson Station, New York, USA
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