December weather forecast
Riddlesburg, PA

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Weather in December

The first month of the winter, December, is still a cold month in Riddlesburg, Pennsylvania, with an average temperature varying between 38.5°F (3.6°C) and 27.3°F (-2.6°C).

Temperature

A subtle decrease in the average high-temperature marks December, falling from November's chilly 48°F (8.9°C) to a wintry 38.5°F (3.6°C). In the month of December, Riddlesburg records a consistent average low-temperature of 27.3°F (-2.6°C).

Humidity

The average relative humidity in December is 81%.

Rainfall

In Riddlesburg, in December, it is raining for 10.2 days, with typically 1.57" (40mm) of accumulated precipitation. In Riddlesburg, during the entire year, the rain falls for 146.6 days and collects up to 19.84" (504mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Riddlesburg, in December, snow falls for 6.7 days, with typically accumulated 2.2" (56mm) of snow. Throughout the year, there are 37.4 snowfall days, and 14.61" (371mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year in Riddlesburg.
On the first day of December, sunrise is at 7:16 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:57 pm EST.

Sunshine

The average sunshine in December is 4.4h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the UV index of 2 transforms into the following advice:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.

Frequently asked questions

How cold is December?

The average high-temperature and low-temperature during December are 38.5°F (3.6°C) and 27.3°F (-2.6°C) respectively. The average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in July is evaluated at 89.6°F (32°C).

What is the average humidity in December?

In Riddlesburg, the average relative humidity in December is 81%.

How many days does it rain in December in Riddlesburg?

In December, the rain falls for 10.2 days. Throughout December, 1.57" (40mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 6.7 days. Throughout December, 2.2" (56mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In Riddlesburg, the average day length in December is 9h and 22min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:16 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:57 pm EST.

How many hours of sunshine does Riddlesburg have in December?

The average sunshine duration in December is 4.4h.

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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 December
Riddlesburg, PA

Average temperature in December - Riddlesburg, PA
  • Average high temperature in December: 38.5°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure in December
Riddlesburg, PA

Average pressure in December - Riddlesburg, 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
Riddlesburg, PA

Average wind speed in December - Riddlesburg, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

Average humidity in December
Riddlesburg, PA

Average humidity in December - Riddlesburg, PA
  • Average humidity in December: 81%

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in December
Riddlesburg, PA

Average rainfall in December - Riddlesburg, PA
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is November (1.18").

Average rainfall days in December
Riddlesburg, PA

Average rainfall days in December - Riddlesburg, PA
  • Average rainfall days in December: 10.2 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in December
Riddlesburg, PA

Average snowfall in December - Riddlesburg, PA
  • Average snowfall in December: 2.2"

The month with the highest snowfall is February (3.74").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Riddlesburg, PA

Average snowfall days in December - Riddlesburg, PA
  • Average snowfall days in December: 6.7 days

The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Riddlesburg, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

Average sunshine days in December
Riddlesburg, PA

Average sunshine days in December - Riddlesburg, PA
  • Average sunshine days in December: 16.8 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

Average UV index in December
Riddlesburg, PA

Average UV index in December - Riddlesburg, PA
  • Average UV index in December: 2

The month with the highest UV index is June (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
Riddlesburg, PA

Average cloud cover in December - Riddlesburg, PA
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Riddlesburg, PA

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

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

Riddlesburg, Pennsylvania, USA

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