January weather forecast
Philadelphia, PA

The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania
The George Washington statue in front of the Independence Hall in Philadelphia, Pennsylvania

Weather in January

January, like December, in Philadelphia, Pennsylvania, is a wintry winter month, with temperature in the range of an average high of 37.4°F (3°C) and an average low of 25.5°F (-3.6°C).

Temperature

The coldest month is January, with an average high-temperature of 37.4°F (3°C) and an average low-temperature of 25.5°F (-3.6°C).

Humidity

In January, the average relative humidity is 74%.

Rainfall

The months with the least rainfall in Philadelphia, Pennsylvania, are January and February Rain falls for 7.3 days and accumulates 0.83" (21mm) of rain.

Snowfall

Months with snowfall are January through May, November and December. In January, in Philadelphia, it is snowing for 3.8 days. Throughout January, 0.87" (22mm) of snow is 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 January, the average ocean temperature in Philadelphia is 41.9°F (5.5°C).
Note: Swimming in 41.9°F (5.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The average length of the day in January is 9h and 43min.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:09 am and sunset at 5:18 pm EST.

Sunshine

In January, the average sunshine in Philadelphia is 5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Philadelphia?

With an average high-temperature of 37.4°F (3°C) and an average low-temperature of 25.5°F (-3.6°C), January is the coldest month in Philadelphia.

What is the average humidity in January in Philadelphia?

In January, the average relative humidity in Philadelphia, Pennsylvania, is 74%.

What is the driest month in Philadelphia?

The months with the least rainfall in Philadelphia are January and February Rain falls for 7.3 days and accumulates 0.83" (21mm) of rain.

How much does it rain in Philadelphia in January?

In Philadelphia, in January, it is raining for 7.3 days, with typically 0.83" (21mm) of accumulated precipitation.

How many days does it snow in January in Philadelphia?

In Philadelphia, in January, snow falls for 3.8 days, with typically accumulated 0.87" (22mm) of snow.

How cold is the water in January in Philadelphia?

In January, the average ocean temperature in Philadelphia is 41.9°F (5.5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

How many hours of daylight does Philadelphia have in January?

In January, the average day length in Philadelphia is 9h and 43min.

When are sunrise and sunset in January in Philadelphia?

On the first day of January in Philadelphia, sunrise is at 7:22 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 5:18 pm EST.

How many hours of sunshine does Philadelphia have in January?

In Philadelphia, Pennsylvania, the average sunshine duration in January is 5h.

What are the months with the lowest UV index in Philadelphia?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in January in Philadelphia?

The average daily maximum UV index in January in Philadelphia is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Philadelphia, PA

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).

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Average pressure in January
Philadelphia, PA

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).

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Average wind speed in January
Philadelphia, PA

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).

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Average humidity in January
Philadelphia, PA

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%).

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Average rainfall in January
Philadelphia, PA

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").

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Average rainfall days in January
Philadelphia, PA

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).

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Average snowfall in January
Philadelphia, PA

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").

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Average snowfall days in January
Philadelphia, PA

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).

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Average sea temperature in January
Philadelphia, PA

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).

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Average daylight in January /
Average sunshine in January
Philadelphia, PA

Average daylight in January / Average sunshine in January - Philadelphia, PA
  • Average daylight in January: 9h and 43min

The month with the longest days is June (Average daylight: 14h and 58min).
The month with the shortest days is December (Average daylight: 9h and 23min).

  • 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).

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Average sunshine days in January
Philadelphia, PA

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).

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Average UV index in January
Philadelphia, PA

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).

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Average cloud cover in January
Philadelphia, PA

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).

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Average visibility in January
Philadelphia, PA

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).

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