December weather forecast
Walther, PA

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Weather in December

December, the first month of the winter in Walther, is still a cold month, with an average temperature varying between 28.6°F (-1.9°C) and 40.1°F (4.5°C).

Temperature

Walther's December weather shows a moderate shift in high-temperatures, falling from November's chilly 49.3°F (9.6°C) to an icy 40.1°F (4.5°C). Nightly temperatures drop to an average low of 28.6°F (-1.9°C) in December.

Humidity

In Walther, Pennsylvania, the average relative humidity in December is 83%.

Rainfall

In Walther, during December, the rain falls for 13.4 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, in Walther, there are 187.9 rainfall days, and 35.59" (904mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 13 days. Throughout December, 4.53" (115mm) of snow is accumulated. In Walther, Pennsylvania, during the entire year, snow falls for 60 days and aggregates up to 23.31" (592mm) of snow.

Daylight

The month with the shortest days in Walther is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of December, in Walther, sunrise is at 7:42 am and sunset at 5:04 pm EST.

Sunshine

The average sunshine in December is 3.4h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: In December, a daily UV index of 1 turns into the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Walther?

In December, in Walther, the average high-temperature is 40.1°F (4.5°C), and the average low-temperature is 28.6°F (-1.9°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is computed to be 87.8°F (31°C).

What is the average humidity in December in Walther?

The average relative humidity in December is 83%.

How many days does it rain in December in Walther?

In Walther, Pennsylvania, in December, it is raining for 13.4 days, with typically 3.03" (77mm) of accumulated precipitation.

How much does it snow in Walther in December?

In Walther, Pennsylvania, during December, snow falls for 13 days and regularly aggregates up to 4.53" (115mm) of snow.

What is the month with the shortest days in Walther?

The month with the shortest days in Walther, Pennsylvania, is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Walther have in December?

The average day length in December in Walther, Pennsylvania, is 9h and 21min.

When is the sunrise / sunset in December in Walther?

On the first day of December in Walther, sunrise is at 7:24 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:04 pm EST.

How many hours of sunshine does Walther have in December?

In December, the average sunshine duration in Walther, Pennsylvania, is 3.4h.

When is the lowest UV index in Walther?

The month with the lowest UV index in Walther, Pennsylvania, is December, with an average maximum UV index of 1.

How high is the UV index in December in Walther?

In December, the average daily maximum UV index in Walther is 1. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to 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 December
Walther, PA

Average temperature in December - Walther, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 28.6°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure in December
Walther, PA

Average pressure in December - Walther, PA
  • Average pressure in December: 30.11"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 December
Walther, PA

Average wind speed in December - Walther, PA
  • Average wind speed in December: 7.2mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).

Average humidity in December
Walther, PA

Average humidity in December - Walther, PA
  • Average humidity in December: 83%

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (75%).

Average rainfall in December
Walther, PA

Average rainfall in December - Walther, PA
  • Average rainfall in December: 3.03"

The wettest month (with the highest rainfall) is May (3.66").
The driest month (with the least rainfall) is November (2.2").

Average rainfall days in December
Walther, PA

Average rainfall days in December - Walther, PA
  • Average rainfall days in December: 13.4 days

The month with the highest number of rainy days is May (21.5 days).
The month with the least rainy days is February (11.3 days).

Average snowfall in December
Walther, PA

Average snowfall in December - Walther, PA
  • Average snowfall in December: 4.53"

The month with the highest snowfall is January (5.83").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Walther, PA

Average snowfall days in December - Walther, PA
  • Average snowfall days in December: 13 days

The month with the highest number of snowfall days is January (17.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Walther, PA

Average daylight in December / Average sunshine in December - Walther, PA
  • Average daylight in December: 9h and 2min

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 December: 3h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Walther, PA

Average sunshine days in December - Walther, PA
  • Average sunshine days in December: 9.9 days

The month with the most sunshine days is November (15.1 days).
The month with the least sunshine days is January (7.7 days).

Average UV index in December
Walther, PA

Average UV index in December - Walther, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Walther, PA

Average cloud cover in December - Walther, PA
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).

Average visibility in December
Walther, PA

Average visibility in December - Walther, PA
  • Average visibility in December: 5mi

The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January and February (4mi).

Walther, Pennsylvania, USA

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