January weather forecast
Willow Grove, PA

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Weather in January

January, the same as December, is an icy winter month in Willow Grove, Pennsylvania, with an average temperature varying between 24.6°F (-4.1°C) and 36.7°F (2.6°C).

Temperature

January is the coldest month, with an average high-temperature of 36.7°F (2.6°C) and an average low-temperature of 24.6°F (-4.1°C).

Humidity

In January, the average relative humidity is 75%.

Rainfall

In Willow Grove, Pennsylvania, during January, the rain falls for 6.6 days and regularly aggregates up to 0.83" (21mm) of precipitation. In Willow Grove, during the entire year, the rain falls for 122.4 days and collects up to 12.68" (322mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Willow Grove. In Willow Grove, in January, snow falls for 5.1 days, with typically accumulated 1.18" (30mm) of snow. In Willow Grove, Pennsylvania, during the entire year, snow falls for 16.3 days and aggregates up to 4.72" (120mm) of snow.

Daylight

In January, the average length of the day is 9h and 42min.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:45 pm. On the last day of January, sunrise is at 7:10 am and sunset at 5:17 pm EST.

Sunshine

In Willow Grove, the average sunshine in January is 5h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 2 during January translates into these guidelines:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

With average temperatures fluctuating between a high of 36.7°F (2.6°C) and a low of 24.6°F (-4.1°C), January stands out as the coldest month.

How cold is it in January?

The high-temperature in Willow Grove during January is 36.7°F (2.6°C) and the low-temperature is 24.6°F (-4.1°C).

What is the average humidity in January?

In Willow Grove, the average relative humidity in January is 75%.

How many days does it rain in January?

In Willow Grove, Pennsylvania, in January, during 6.6 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

How much does it snow in January?

In Willow Grove, in January, during 5.1 snowfall days, 1.18" (30mm) of snow is typically accumulated.

What is the average length of the day in January?

In January, the average day length is 9h and 42min.

When is the sunrise / sunset in January?

On the first day of January, 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 5:17 pm EST.

How many hours of sunshine does Willow Grove have in January?

In Willow Grove, the average sunshine duration in January is 5h.

When is the lowest UV index?

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

What is the UV index intensity in January?

The average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.
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
Willow Grove, PA

Average temperature in January - Willow Grove, PA
  • Average high temperature in January: 36.7°F

The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in January: 24.6°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

Average pressure in January
Willow Grove, PA

Average pressure in January - Willow Grove, 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
Willow Grove, PA

Average wind speed in January - Willow Grove, PA
  • Average wind speed in January: 8mph

The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in January
Willow Grove, PA

Average humidity in January - Willow Grove, PA
  • Average humidity in January: 75%

The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April, July and August (72%).

Average rainfall in January
Willow Grove, PA

Average rainfall in January - Willow Grove, PA
  • Average rainfall in January: 0.83"

The wettest month (with the highest rainfall) is August (1.54").
The driest month (with the least rainfall) is September (0.75").

Average rainfall days in January
Willow Grove, PA

Average rainfall days in January - Willow Grove, PA
  • Average rainfall days in January: 6.6 days

The month with the highest number of rainy days is May (14.1 days).
The month with the least rainy days is November (6.4 days).

Average snowfall in January
Willow Grove, PA

Average snowfall in January - Willow Grove, PA
  • Average snowfall in January: 1.18"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in January
Willow Grove, PA

Average snowfall days in January - Willow Grove, PA
  • Average snowfall days in January: 5.1 days

The month with the highest number of snowfall days is January (5.1 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
Willow Grove, PA

Average daylight in January / Average sunshine in January - Willow Grove, 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 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in January
Willow Grove, PA

Average sunshine days in January - Willow Grove, PA
  • Average sunshine days in January: 21.1 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (14.4 days).

Average UV index in January
Willow Grove, PA

Average UV index in January - Willow Grove, 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, March, November and December (UV index 2).

Average cloud cover in January
Willow Grove, PA

Average cloud cover in January - Willow Grove, PA
  • Average cloud cover in January: 45

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in January
Willow Grove, PA

Average visibility in January - Willow Grove, PA
  • Average visibility in January: 6mi

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

Willow Grove, Pennsylvania, USA

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