December weather forecast
Altor, PA

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Weather in December

December, the first month of the winter in Altor, is also a frosty month, with an average temperature ranging between max 42.8°F (6°C) and min 31.3°F (-0.4°C).

Temperature

A shift in Altor's weather is observed as November turns into December, with the average high temperature reducing from a cool 52°F (11.1°C) to a frosty 42.8°F (6°C). An average low-temperature of 31.3°F (-0.4°C) is observed during December nights.

Humidity

In December, the average relative humidity is 78%.

Rainfall

In Altor, in December, during 8.3 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Altor, Pennsylvania, during the entire year, the rain falls for 128.5 days and collects up to 14.92" (379mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In Altor, during December, snow falls for 2.5 days and regularly aggregates up to 0.59" (15mm) of snow. Throughout the year, there are 18.1 snowfall days, and 5.43" (138mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:47 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.

Frequently asked questions

How cold does it get in Altor in December?

The average high-temperature and low-temperature during December are 42.8°F (6°C) and 31.3°F (-0.4°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in December in Altor?

In Altor, the average relative humidity in December is 78%.

How much does it rain in December?

In December, the rain falls for 8.3 days. Throughout December, 1.18" (30mm) of precipitation is accumulated.

How much does it snow in December?

In Altor, during December, snow falls for 2.5 days and regularly aggregates up to 0.59" (15mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Altor have in December?

In Altor, the average day length in December is 9h and 23min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:05 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:47 pm EST.

How many hours of sunshine does Altor have in December?

The average sunshine duration in December in Altor, Pennsylvania, is 4.8h.

What are the months with 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 reading in December?

In Altor, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
Altor, PA

Average temperature in December - Altor, PA
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in December: 31.3°F

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (24.4°F).

Average pressure in December
Altor, PA

Average pressure in December - Altor, PA
  • Average pressure in December: 30.1"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 December
Altor, PA

Average wind speed in December - Altor, PA
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in December
Altor, PA

Average humidity in December - Altor, PA
  • Average humidity in December: 78%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December
Altor, PA

Average rainfall in December - Altor, PA
  • Average rainfall in December: 1.18"

The wettest month (with the highest rainfall) is August (2.01").
The driest month (with the least rainfall) is January (0.83").

Average rainfall days in December
Altor, PA

Average rainfall days in December - Altor, PA
  • Average rainfall days in December: 8.3 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (5.7 days).

Average snowfall in December
Altor, PA

Average snowfall in December - Altor, PA
  • Average snowfall in December: 0.59"

The month with the highest snowfall is March (1.54").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Altor, PA

Average snowfall days in December - Altor, PA
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Altor, 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: 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 December
Altor, PA

Average sunshine days in December - Altor, PA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is August (13.1 days).

Average UV index in December
Altor, PA

Average UV index in December - Altor, PA
  • Average UV index in December: 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 December
Altor, PA

Average cloud cover in December - Altor, PA
  • Average cloud cover in December: 48

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 December
Altor, PA

Average visibility in December - Altor, PA
  • Average visibility in December: 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).

Altor, Pennsylvania, USA

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