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
Temperature readings reach their annual highs in January, averaging 28.8°F (-1.8°C) and a minimum average of 16.3°F (-8.7°C).Humidity
In Saint Marys, the average relative humidity in January is 87%.Rainfall
The months with the least rainfall are January and November Rain falls for 5.3 days and accumulates 0.83" (21mm) of rain.Snowfall
Months with snowfall in Saint Marys are January through May, October through December. In Saint Marys, during January, snow falls for 12.2 days and regularly aggregates up to 2.91" (74mm) of snow. Throughout the year, there are 52.7 snowfall days, and 16.14" (410mm) of snow is accumulated.Daylight
In Saint Marys, Pennsylvania, the average length of the day in January is 9h and 35min.On the first day of January, sunrise is at 7:40 am and sunset at 4:55 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:28 pm EST.
Sunshine
January has the least sunshine of the year, with an average of 2.5h of sunshine.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In January, the maximum UV index of 1 suggests these recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
How cold is January?
What is the average humidity in January?
What is the driest month?
How many days does it rain in January?
How many days does it snow in January?
What is the average length of the day in January?
When are sunrise and sunset in January?
What is the month with the least sunshine in Saint Marys?
How many hours of sunshine does Saint Marys have in January?
When is the lowest UV index?
What is the UV index reading in January?
Average temperature in January
Saint Marys, PA
- Average high temperature in January: 28.8°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in January: 16.3°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).
Average pressure in January
Saint Marys, PA
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in January
Saint Marys, PA
- Average wind speed in January: 8.9mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in January
Saint Marys, PA
- Average humidity in January: 87%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are June and July (78%).
Average rainfall in January
Saint Marys, PA
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is April (1.5").
The driest months (with the least rainfall) are January and November (0.83").
Average rainfall days in January
Saint Marys, PA
- Average rainfall days in January: 5.3 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in January
Saint Marys, PA
- Average snowfall in January: 2.91"
The month with the highest snowfall is February (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in January
Saint Marys, PA
- Average snowfall days in January: 12.2 days
The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Saint Marys, PA
- 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: 2h and 3min
The months with the most sunshine are July and August (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).
Average sunshine days in January
Saint Marys, PA
- Average sunshine days in January: 17.6 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (13 days).
Average UV index in January
Saint Marys, PA
- Average UV index in January: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Saint Marys, PA
- Average cloud cover in January: 77
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in January
Saint Marys, PA
- Average visibility in January: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (5mi).
The months with the lowest visibility are August and September (4mi).
Saint Marys, Pennsylvania, USA
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