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
The start of December signals a gentle decrease in the average high-temperature, transitioning from a cool 50.4°F (10.2°C) in November to a cold 41.5°F (5.3°C). The average temperature during December nights dips to a subzero cold 29.3°F (-1.5°C).Humidity
In Orrtanna, the average relative humidity in December is 79%.Rainfall
In Orrtanna, in December, it is raining for 7.7 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, there are 125.3 rainfall days, and 10.59" (269mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Orrtanna, in December, snow falls for 2.9 days, with typically accumulated 0.43" (11mm) of snow. In Orrtanna, during the entire year, snow falls for 20.2 days and aggregates up to 3.54" (90mm) of snow.Daylight
The month with the shortest days in Orrtanna is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:54 pm EST.
Sunshine
The average sunshine in December is 4.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December in Orrtanna?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December in Orrtanna?
How many hours of sunshine does Orrtanna have in December?
When is the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Orrtanna, PA
- Average high temperature in December: 41.5°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).
Average pressure in December
Orrtanna, 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
Orrtanna, PA
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in December
Orrtanna, PA
- Average humidity in December: 79%
The months with the highest relative humidity are February, May and October (80%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Orrtanna, PA
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is May (1.26").
The driest month (with the least rainfall) is September (0.55").
Average rainfall days in December
Orrtanna, PA
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in December
Orrtanna, PA
- Average snowfall in December: 0.43"
The month with the highest snowfall is January (1.06").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Orrtanna, PA
- Average snowfall days in December: 2.9 days
The month with the highest number of snowfall days is January (6.7 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
Orrtanna, 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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Orrtanna, PA
- Average sunshine days in December: 20.7 days
The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is May (12.9 days).
Average UV index in December
Orrtanna, PA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Orrtanna, PA
- Average cloud cover in December: 49
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Orrtanna, PA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, June, July, November and December (6mi).
The months with the lowest visibility are January, February, May, August, September and October (5mi).
Orrtanna, Pennsylvania, USA
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