December weather forecast
Niles Valley, PA

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Weather in December

December, the first month of the winter in Niles Valley, is also an icy month, with an average temperature ranging between max 34.7°F (1.5°C) and min 25°F (-3.9°C).

Temperature

In December, the average high-temperature decreases from a chilly 44.1°F (6.7°C) in November to a cold 34.7°F (1.5°C). An average low-temperature of 25°F (-3.9°C) marks the month of December.

Humidity

The average relative humidity in December is 85%.

Rainfall

In Niles Valley, in December, it is raining for 12.1 days, with typically 2.48" (63mm) of accumulated precipitation. Throughout the year, there are 175.2 rainfall days, and 30.39" (772mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 16.1 days. Throughout December, 7.09" (180mm) of snow is accumulated. Throughout the year, there are 80.1 snowfall days, and 36.85" (936mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:17 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:36 am and sunset at 4:48 pm EST.

Sunshine

December has the least sunshine of the year, with an average of 3.1h of sunshine.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 34.7°F (1.5°C) and a low-temperature of 25°F (-3.9°C).

What is the average humidity in December?

In Niles Valley, the average relative humidity in December is 85%.

How many days does it rain in December in Niles Valley?

In Niles Valley, during December, the rain falls for 12.1 days and regularly aggregates up to 2.48" (63mm) of precipitation.

How much does it snow in Niles Valley in December?

In December, it is snowing for 16.1 days. Throughout December, 7.09" (180mm) of snow is accumulated.

What is the month with the shortest days?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

The average day length in December is 9h and 12min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:17 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:48 pm EST.

What is the month with the least sunshine?

With an average of 3.1h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does Niles Valley have in December?

In Niles Valley, the average sunshine duration in December is 3.1h.

What is the month with the lowest UV index?

The months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the UV index reading in December?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe 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 December
Niles Valley, PA

Average temperature in December - Niles Valley, PA
  • Average high temperature in December: 34.7°F

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (28.6°F).

  • Average low temperature in December: 25°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

Average pressure in December
Niles Valley, PA

Average pressure in December - Niles Valley, PA
  • Average pressure in December: 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 December
Niles Valley, PA

Average wind speed in December - Niles Valley, PA
  • Average wind speed in December: 8.3mph

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Niles Valley, PA

Average humidity in December - Niles Valley, PA
  • Average humidity in December: 85%

The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is June (78%).

Average rainfall in December
Niles Valley, PA

Average rainfall in December - Niles Valley, PA
  • Average rainfall in December: 2.48"

The wettest month (with the highest rainfall) is April (3.35").
The driest month (with the least rainfall) is November (1.97").

Average rainfall days in December
Niles Valley, PA

Average rainfall days in December - Niles Valley, PA
  • Average rainfall days in December: 12.1 days

The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is February (8.5 days).

Average snowfall in December
Niles Valley, PA

Average snowfall in December - Niles Valley, PA
  • Average snowfall in December: 7.09"

The month with the highest snowfall is February (9.06").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Niles Valley, PA

Average snowfall days in December - Niles Valley, PA
  • Average snowfall days in December: 16.1 days

The month with the highest number of snowfall days is January (18.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Niles Valley, PA

Average daylight in December / Average sunshine in December - Niles Valley, PA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 3h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).

Average sunshine days in December
Niles Valley, PA

Average sunshine days in December - Niles Valley, PA
  • Average sunshine days in December: 7.8 days

The month with the most sunshine days is September (14 days).
The month with the least sunshine days is February (7.4 days).

Average UV index in December
Niles Valley, PA

Average UV index in December - Niles Valley, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Niles Valley, PA

Average cloud cover in December - Niles Valley, PA
  • Average cloud cover in December: 69

The month with the most cloud cover is December (Cloud cover 69).
The months with the least cloud cover are July and August (Cloud cover 39).

Average visibility in December
Niles Valley, PA

Average visibility in December - Niles Valley, PA
  • Average visibility in December: 5mi

The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (5mi).
The month with the lowest visibility is February (4mi).

Niles Valley, Pennsylvania, USA

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