January weather - Winter 2025

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

The iconic and unifying Pennsylvania monument in a vast green field with neat grounds and green trees in the city of Gettysburg, Pennsylvania

Weather in January

During January in Gettysburg, Pennsylvania, weather patterns exhibit classic winter conditions, being the second coldest month after December. The low temperatures bring about the formation of a frosty landscape typical during this time of year. Falling below freezing, temperatures may range from 22.6°F (-5.2°C) to 35.6°F (2°C) that facilitates frequent snowfall with an average accumulation of 1.26" (32mm) throughout the month. Days in January are characterized by short daylight hours and a high likelihood of cloud cover. Barometric pressure systems typical of winter months are also a common occurrence.

Temperature

Gettysburg's temperature records reveal January as the coldest month, marked by average highs of 35.6°F (2°C) and lows of 22.6°F (-5.2°C).

Humidity

In January, the average relative humidity is 76%.

Rainfall

January and February are months with the least rain when the rain falls for 5 days and typically aggregates up to 0.71" (18mm) of rain.

Snowfall

Months with snowfall are January through April, October through December. In Gettysburg, during January, snow falls for 6.1 days and regularly aggregates up to 1.26" (32mm) of snow. Throughout the year, there are 20.9 snowfall days, and 4.8" (122mm) of snow is accumulated.

Daylight

In Gettysburg, the average length of the day in January is 9h and 44min.
On the first day of the month, sunrise is at 7:30 am and sunset at 4:54 pm. On the last day of January, sunrise is at 7:18 am and sunset at 5:26 pm EST.

Sunshine

The average sunshine in January is 4.8h.

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 value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 2 in January transforms into this advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.

Updated: Jun 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

January is the coldest month of the year, registering average temperatures as high as 35.6°F (2°C) and as low as 22.6°F (-5.2°C).

How cold is January?

In Gettysburg, 35.6°F (2°C) is the average high-temperature and 22.6°F (-5.2°C) is the average low-temperature during January.

What is the average humidity in January?

In Gettysburg, the average relative humidity in January is 76%.

What is the driest month?

January and February are months with the least rain when the rain falls for 5 days and typically aggregates up to 0.71" (18mm) of rain.

How much does it rain in January?

In Gettysburg, during January, the rain falls for 5 days and regularly aggregates up to 0.71" (18mm) of precipitation.

How much does it snow in January?

In January, it is snowing for 6.1 days. Throughout January, 1.26" (32mm) of snow is accumulated.

What is the average length of the day in January?

The average day length in January is 9h and 44min.

When is the sunrise / sunset in January in Gettysburg?

In January, on the first day of the month, sunrise is at 7:30 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 5:26 pm EST.

How many hours of sunshine does Gettysburg have 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.

What is the UV index intensity in January?

In Gettysburg, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

41.5°F 5.3°C

35.6°F 2°C

39.4°F 4.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

8.2mph 13.2km/h

8.8mph 14.2km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

20.6

20.8

16.8

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Gettysburg, PA

Average high temperature in January: 35.6°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.6°F).

Average low temperature in January: 22.6°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

Average pressure in January
Gettysburg, PA

Average pressure in January: 30.1"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in January
Gettysburg, PA

Average wind speed in January: 8.1mph

The windiest months (with the highest average wind speed) are January, February and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in January
Gettysburg, PA

Average humidity in January: 76%

The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are April and July (75%).

Average rainfall in January
Gettysburg, PA

Average rainfall in January: 0.71"

The wettest month (with the highest rainfall) is July (1.46").
The driest months (with the least rainfall) are January and February (0.71").

Average rainfall days in January
Gettysburg, PA

Average rainfall days in January: 5 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (5 days).

Average snowfall in January
Gettysburg, PA

Average snowfall in January: 1.26"

The month with the highest snowfall is March (1.3").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in January
Gettysburg, PA

Average snowfall days in January: 6.1 days

The month with the highest number of snowfall days is February (6.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 54min).
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
Gettysburg, PA

Average sunshine days in January: 20.8 days

The month with the most sunshine days is November (21.6 days).
The month with the least sunshine days is August (13.6 days).

Average UV index in January
Gettysburg, PA

Average UV index in January: 2

The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in January
Gettysburg, PA

Average cloud cover in January: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in January
Gettysburg, 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).

January weather forecast
Gettysburg, PA

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