Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Penllyn in December undergoes a mild reduction in the average high-temperature, shifting from November's cool 52.2°F (11.2°C) to a chilly 42.8°F (6°C). In the month of December, Penllyn records a consistent average low-temperature of 31.6°F (-0.2°C).Humidity
The months with the highest humidity in Penllyn are February, October and December, with an average relative humidity of 78%.Rainfall
In Penllyn, in December, during 7.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. Throughout the year, in Penllyn, there are 122.4 rainfall days, and 12.68" (322mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Penllyn, Pennsylvania, in December, snow falls for 2.5 days, with typically accumulated 0.71" (18mm) of snow. Throughout the year, in Penllyn, Pennsylvania, there are 16.3 snowfall days, and 4.72" (120mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:04 am and sunset at 4:35 pm. On the last day of December, in Penllyn, sunrise is at 7:23 am and sunset at 4:45 pm EST.
Sunshine
In Penllyn, the average sunshine in December is 5h.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 minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
How cold is it in Penllyn in December?
What are the most humid months in Penllyn?
What is the average humidity in December in Penllyn?
How many days does it rain in December in Penllyn?
How many days does it snow in December in Penllyn?
What is the month with the shortest days in Penllyn?
How many hours of daylight does Penllyn have in December?
When is the sunrise / sunset in December in Penllyn?
How many hours of sunshine does Penllyn have in December?
What is the month with the lowest UV index in Penllyn?
What is the UV index reading in December in Penllyn?
Average temperature in December
Penllyn, PA
- Average high temperature in December: 42.8°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in December: 31.6°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in December
Penllyn, 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
Penllyn, PA
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
Penllyn, PA
- Average humidity in December: 78%
The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April, July and August (72%).
Average rainfall in December
Penllyn, PA
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is August (1.54").
The driest month (with the least rainfall) is September (0.75").
Average rainfall days in December
Penllyn, PA
- Average rainfall days in December: 7.5 days
The month with the highest number of rainy days is May (14.1 days).
The month with the least rainy days is November (6.4 days).
Average snowfall in December
Penllyn, PA
- Average snowfall in December: 0.71"
The month with the highest snowfall is February (1.46").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Penllyn, PA
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is January (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Penllyn, 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: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Penllyn, PA
- Average sunshine days in December: 20.9 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (14.4 days).
Average UV index in December
Penllyn, 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
Penllyn, PA
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Penllyn, 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).
Penllyn, Pennsylvania, USA
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