December weather forecast
Byrnedale, PA

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Weather in December

December, the first month of the winter in Byrnedale, is still a cold month, with an average temperature fluctuating between 25°F (-3.9°C) and 34.7°F (1.5°C).

Temperature

During the transition into December, Byrnedale observes a decrease in the average high-temperature, falling from a chilly 44.4°F (6.9°C) in November to a wintry 34.7°F (1.5°C). Byrnedale encounters a steady low-temperature average of 25°F (-3.9°C) throughout the month of December.

Humidity

In December, the average relative humidity is 87%.

Rainfall

In Byrnedale, in December, it is raining for 7.5 days, with typically 1.06" (27mm) of accumulated precipitation. In Byrnedale, during the entire year, the rain falls for 118.9 days and collects up to 13.31" (338mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 10.2 days. Throughout December, 2.6" (66mm) of snow is accumulated. Throughout the year, there are 52.7 snowfall days, and 16.14" (410mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:21 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:55 pm EST.

Sunshine

In Byrnedale, the average sunshine in December is 2.6h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 1 in December translates into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Byrnedale, is 34.7°F (1.5°C), while the low-temperature averages to 25°F (-3.9°C).

What is the average humidity in December?

The average relative humidity in December is 87%.

How many days does it rain in December in Byrnedale?

In Byrnedale, during December, the rain falls for 7.5 days and regularly aggregates up to 1.06" (27mm) of precipitation.

How many days does it snow in December?

In Byrnedale, during December, snow falls for 10.2 days and regularly aggregates up to 2.6" (66mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 15min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:21 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:55 pm EST.

How long on average sun shines in December?

In Byrnedale, the average sunshine duration in December is 2.6h.

What are the months with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. 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
Byrnedale, PA

Average temperature in December - Byrnedale, 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 (28.8°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 (16.3°F).

Average pressure in December
Byrnedale, PA

Average pressure in December - Byrnedale, 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
Byrnedale, PA

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

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Byrnedale, PA

Average humidity in December - Byrnedale, PA
  • Average humidity in December: 87%

The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are June and July (78%).

Average rainfall in December
Byrnedale, PA

Average rainfall in December - Byrnedale, PA
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is April (1.5").
The driest months (with the least rainfall) are January and November (0.83").

Average rainfall days in December
Byrnedale, PA

Average rainfall days in December - Byrnedale, PA
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.1 days).

Average snowfall in December
Byrnedale, PA

Average snowfall in December - Byrnedale, PA
  • Average snowfall in December: 2.6"

The month with the highest snowfall is February (4.21").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Byrnedale, PA

Average snowfall days in December - Byrnedale, PA
  • Average snowfall days in December: 10.2 days

The month with the highest number of snowfall days is January (12.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 2h and 4min

The months with the most sunshine are July and August (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 2h and 30min).

Average sunshine days in December
Byrnedale, PA

Average sunshine days in December - Byrnedale, PA
  • Average sunshine days in December: 16.5 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (13 days).

Average UV index in December
Byrnedale, PA

Average UV index in December - Byrnedale, 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
Byrnedale, PA

Average cloud cover in December - Byrnedale, PA
  • Average cloud cover in December: 75

The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 42).

Average visibility in December
Byrnedale, PA

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

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

Byrnedale, Pennsylvania, USA

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