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
January, with average temperatures reaching a high of 33.4°F (0.8°C) and a low of 20.8°F (-6.2°C), is the coldest month.Humidity
In January, the average relative humidity is 79%.Rainfall
In January, the rain falls for 7.2 days. Throughout January, 1.69" (43mm) of precipitation is accumulated. In Williamstown, during the entire year, the rain falls for 148.4 days and collects up to 25.55" (649mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Williamstown. In Williamstown, in January, snow falls for 6.9 days, with typically accumulated 3.39" (86mm) of snow. In Williamstown, during the entire year, snow falls for 26.2 days and aggregates up to 12.32" (313mm) of snow.Daylight
In Williamstown, Pennsylvania, the average length of the day in January is 9h and 40min.On the first day of the month, sunrise is at 7:29 am and sunset at 4:49 pm. On the last day of January, sunrise is at 7:17 am and sunset at 5:22 pm EST.
Sunshine
In January, the average sunshine is 4.3h.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 radiation for ordinary individuals.Note: A maximum high daily UV index of 2 during January translates into the following directions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
How cold is it in Williamstown in January?
What is the average humidity in January?
How much does it rain in Williamstown in January?
How much does it snow in Williamstown in January?
How many hours of daylight does Williamstown have in January?
When are sunrise and sunset in January?
How long on average sun shines in January?
What are the months with the lowest UV index in Williamstown?
What is the UV index intensity in January?
Average temperature in January
Williamstown, PA
- Average high temperature in January: 33.4°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in January: 20.8°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in January
Williamstown, PA
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Williamstown, PA
- Average wind speed in January: 8mph
The windiest months (with the highest average wind speed) are March and April (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in January
Williamstown, PA
- Average humidity in January: 79%
The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in January
Williamstown, PA
- Average rainfall in January: 1.69"
The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is February (1.54").
Average rainfall days in January
Williamstown, PA
- Average rainfall days in January: 7.2 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in January
Williamstown, PA
- Average snowfall in January: 3.39"
The month with the highest snowfall is March (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Williamstown, PA
- Average snowfall days in January: 6.9 days
The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Williamstown, PA
- Average daylight in January: 9h and 4min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in January
Williamstown, PA
- Average sunshine days in January: 18.6 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in January
Williamstown, PA
- Average UV index in January: 2
The months with the highest UV index are June and July (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
Williamstown, PA
- Average cloud cover in January: 53
The months with the most cloud cover are February and December (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in January
Williamstown, PA
- Average visibility in January: 6mi
The months with the highest visibility are January, March, April, June, July, November and December (6mi).
The months with the lowest visibility are February, May, August, September and October (5mi).
Williamstown, Pennsylvania, USA
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