January weather forecast
Bryn Mawr, PA

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Weather in January

January, the same as December, is a wintry winter month in Bryn Mawr, Pennsylvania, with an average temperature ranging between min 25°F (-3.9°C) and max 36.7°F (2.6°C).

Temperature

The month of January, characterized by an average high of 36.7°F (2.6°C) and a low of 25°F (-3.9°C), is recognized as the coldest.

Humidity

The average relative humidity in January is 75%.

Rainfall

January is the month with the least rainfall. Rain falls for 5.3 days and accumulates 0.55" (14mm) of precipitation.

Snowfall

Months with snowfall in Bryn Mawr are January through March, November and December. In Bryn Mawr, during January, snow falls for 4.5 days and regularly aggregates up to 0.87" (22mm) of snow. Throughout the year, there are 15.1 snowfall days, and 3.66" (93mm) of snow is accumulated.

Daylight

The average length of the day in January is 9h and 43min.
On the first day of the month, sunrise is at 7:23 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:10 am and sunset at 5:18 pm EST.

Sunshine

The average sunshine in January in Bryn Mawr is 4.8h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Bryn Mawr. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: The UV index of 2 during January leads to these advisories:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

Frequently asked questions

What is the coldest time of year?

January, on average, is the coldest month, registering a high temperature of 36.7°F (2.6°C) and a low of 25°F (-3.9°C).

How cold is it in January?

In January, the average high-temperature and low-temperature in Bryn Mawr are 36.7°F (2.6°C) and 25°F (-3.9°C) respectively.

What is the average humidity in January?

The average relative humidity in January is 75%.

What is the driest month in Bryn Mawr?

January is the month with the least rainfall. Rain falls for 5.3 days and accumulates 0.55" (14mm) of precipitation.

How much does it rain in January?

In Bryn Mawr, in January, it is raining for 5.3 days, with typically 0.55" (14mm) of accumulated precipitation.

How many days does it snow in January?

In Bryn Mawr, during January, snow falls for 4.5 days and regularly aggregates up to 0.87" (22mm) of snow.

What is the average length of the day in January?

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

What time are sunrise and sunset in January?

On the first day of January, sunrise is at 7:23 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 5:18 pm EST.

How long on average sun shines in January?

The average sunshine duration in January is 4.8h.

When is the lowest UV index?

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

How high is the UV index in January?

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

Average temperature in January
Bryn Mawr, PA

Average temperature in January - Bryn Mawr, PA
  • Average high temperature in January: 36.7°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in January: 25°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in January
Bryn Mawr, PA

Average pressure in January - Bryn Mawr, 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
Bryn Mawr, PA

Average wind speed in January - Bryn Mawr, PA
  • Average wind speed in January: 8.2mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in January
Bryn Mawr, PA

Average humidity in January - Bryn Mawr, PA
  • Average humidity in January: 75%

The months with the highest relative humidity are February and October (78%).
The months with the lowest relative humidity are April, July and August (71%).

Average rainfall in January
Bryn Mawr, PA

Average rainfall in January - Bryn Mawr, PA
  • Average rainfall in January: 0.55"

The wettest months (with the highest rainfall) are July and August (1.14").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in January
Bryn Mawr, PA

Average rainfall days in January - Bryn Mawr, PA
  • Average rainfall days in January: 5.3 days

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is January (5.3 days).

Average snowfall in January
Bryn Mawr, PA

Average snowfall in January - Bryn Mawr, PA
  • Average snowfall in January: 0.87"

The months with the highest snowfall are February and March (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in January
Bryn Mawr, PA

Average snowfall days in January - Bryn Mawr, PA
  • Average snowfall days in January: 4.5 days

The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in January /
Average sunshine in January
Bryn Mawr, PA

Average daylight in January / Average sunshine in January - Bryn Mawr, 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: 4h and 5min

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 36min).

Average sunshine days in January
Bryn Mawr, PA

Average sunshine days in January - Bryn Mawr, PA
  • Average sunshine days in January: 21.9 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is July (14.9 days).

Average UV index in January
Bryn Mawr, PA

Average UV index in January - Bryn Mawr, 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
Bryn Mawr, PA

Average cloud cover in January - Bryn Mawr, PA
  • Average cloud cover in January: 46

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in January
Bryn Mawr, PA

Average visibility in January - Bryn Mawr, PA
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Bryn Mawr, Pennsylvania, USA

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