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 brings the lowest temperatures, with an average high of 37.4°F (3°C) and an average low of 25.5°F (-3.6°C).Humidity
In January, the average relative humidity in Philadelphia is 74%.Rainfall
January and February are months with the least rain in Philadelphia when the rain falls for 7.3 days and typically aggregates up to 0.83" (21mm) of rain.Snowfall
January through May, November and December are months with snowfall in Philadelphia. In Philadelphia, in January, during 3.8 snowfall days, 0.87" (22mm) of snow is typically accumulated. In Philadelphia, Pennsylvania, during the entire year, snow falls for 11.4 days and aggregates up to 2.87" (73mm) of snow.Ocean temperature
In Philadelphia, Pennsylvania, in January, the average water temperature is 41.9°F (5.5°C).Note: Engaging in a swim in 41.9°F (5.5°C) can threaten life. Brief exposure to 55.4°F (13°C) waters is uneasy, and submersion below 50°F (10°C) can lead to cold shock and disrupted breathing patterns, varying by individual.
Daylight
In Philadelphia, the average length of the day in January is 9h and 43min.On the first day of January in Philadelphia, sunrise is at 7:22 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:18 pm EST.
Sunshine
The average sunshine in January is 5h.UV index
The months with the lowest UV index in Philadelphia are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high daily UV index of 2 during January translates into the following directions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Frequently asked questions
What is the coldest month in Philadelphia?
How cold is January in Philadelphia?
What is the average humidity in January in Philadelphia?
What is the driest month in Philadelphia?
How many days does it rain in January in Philadelphia?
How many days does it snow in January in Philadelphia?
How cold is the water in January in Philadelphia?
How many hours of daylight does Philadelphia have in January?
When are sunrise and sunset in January in Philadelphia?
How many hours of sunshine does Philadelphia have in January?
What is the month with the lowest UV index in Philadelphia?
What is the UV index intensity in January in Philadelphia?
Average temperature in January
Philadelphia, PA
- Average high temperature in January: 37.4°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in January: 25.5°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).
Average pressure in January
Philadelphia, PA
- Average pressure in January: 30.08"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
Philadelphia, PA
- Average wind speed in January: 8.2mph
The windiest months (with the highest average wind speed) are March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in January
Philadelphia, PA
- Average humidity in January: 74%
The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and August (71%).
Average rainfall in January
Philadelphia, PA
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is August (1.65").
The driest months (with the least rainfall) are January and February (0.83").
Average rainfall days in January
Philadelphia, PA
- Average rainfall days in January: 7.3 days
The month with the highest number of rainy days is July (14.8 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in January
Philadelphia, PA
- Average snowfall in January: 0.87"
The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in January
Philadelphia, PA
- Average snowfall days in January: 3.8 days
The month with the highest number of snowfall days is January (3.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average sea temperature in January
Philadelphia, PA
- Average sea temperature in January: 41.8°F
The best month for swimming (with the highest average sea temperature) is August (75.9°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).
Average daylight in January /
Average sunshine in January
Philadelphia, 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 24min).
- Average sunshine in January: 5h and 0min
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 48min).
Average sunshine days in January
Philadelphia, PA
- Average sunshine days in January: 20.4 days
The month with the most sunshine days is December (20.9 days).
The month with the least sunshine days is May (13.3 days).
Average UV index in January
Philadelphia, PA
- Average UV index in January: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Philadelphia, PA
- Average cloud cover in January: 45
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in January
Philadelphia, PA
- 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).
Philadelphia, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location
