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 average high-temperature drops in December, from November's frosty 48.4°F (9.1°C) to an icy 38.7°F (3.7°C). Arnold experiences a steady low-temperature of 27.5°F (-2.5°C) throughout December.Humidity
In Arnold, the average relative humidity in December is 84%.Rainfall
In Arnold, in December, it is raining for 13.7 days, with typically 2.99" (76mm) of accumulated precipitation. Throughout the year, there are 185.5 rainfall days, and 35.59" (904mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Arnold, during December, snow falls for 13.5 days and regularly aggregates up to 4.72" (120mm) of snow. Throughout the year, there are 63.1 snowfall days, and 25.12" (638mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December in Arnold, sunrise is at 7:23 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:02 pm EST.
Sunshine
In December, the average sunshine is 3.1h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 1 in December leads to these recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December in Arnold?
What is the month with the shortest days?
How many hours of daylight does Arnold have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Arnold, PA
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (32.7°F).
- Average low temperature in December: 27.5°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in December
Arnold, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Arnold, PA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Arnold, PA
- Average humidity in December: 84%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April, July and August (76%).
Average rainfall in December
Arnold, PA
- Average rainfall in December: 2.99"
The wettest months (with the highest rainfall) are April and May (3.66").
The driest month (with the least rainfall) is November (2.2").
Average rainfall days in December
Arnold, PA
- Average rainfall days in December: 13.7 days
The month with the highest number of rainy days is May (20.2 days).
The month with the least rainy days is January (11.1 days).
Average snowfall in December
Arnold, PA
- Average snowfall in December: 4.72"
The month with the highest snowfall is January (6.73").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Arnold, PA
- Average snowfall days in December: 13.5 days
The month with the highest number of snowfall days is January (18 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Arnold, 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 18min).
- Average sunshine in December: 3h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in December
Arnold, PA
- Average sunshine days in December: 9 days
The month with the most sunshine days is November (14.8 days).
The month with the least sunshine days is January (7.3 days).
Average UV index in December
Arnold, PA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Arnold, PA
- Average cloud cover in December: 67
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Arnold, PA
- Average visibility in December: 5mi
The months with the highest visibility are April and August (6mi).
The months with the lowest visibility are January and February (4mi).
Arnold, Pennsylvania, USA
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