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
December's onset brings a slight change in high-temperatures, falling from a frosty 49.8°F (9.9°C) in November to an icy 40.1°F (4.5°C). Throughout December, an average low-temperature of 29.1°F (-1.6°C) is experienced.Humidity
In Smithfield, the average relative humidity in December is 83%.Rainfall
In Smithfield, Pennsylvania, during December, the rain falls for 9.1 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, in Smithfield, there are 143.4 rainfall days, and 13.19" (335mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Smithfield. In Smithfield, Pennsylvania, during December, snow falls for 11.4 days and regularly aggregates up to 2.44" (62mm) of snow. In Smithfield, during the entire year, snow falls for 56 days and aggregates up to 11.54" (293mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:21 am and sunset at 4:55 pm. On the last day of December, in Smithfield, sunrise is at 7:40 am and sunset at 5:04 pm EST.
Sunshine
The average sunshine in December is 3.8h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 1 during December translates into the following guidance:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
Is December cold in Smithfield?
What is the average humidity in December in Smithfield?
How many days does it rain in December in Smithfield?
How much does it snow in Smithfield in December?
What is the month with the shortest days in Smithfield?
What is the average length of the day in December in Smithfield?
When is the sunrise / sunset in December in Smithfield?
How many hours of sunshine does Smithfield have in December?
What is the month with the lowest UV index in Smithfield?
What is the UV index intensity in December in Smithfield?
Average temperature in December
Smithfield, PA
- Average high temperature in December: 40.1°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (34.3°F).
- Average low temperature in December: 29.1°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in December
Smithfield, 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
Smithfield, PA
- Average wind speed in December: 7mph
The windiest month (with the highest average wind speed) is January (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Smithfield, PA
- Average humidity in December: 83%
The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are July and August (77%).
Average rainfall in December
Smithfield, PA
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is May (1.57").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days in December
Smithfield, PA
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (8.2 days).
Average snowfall in December
Smithfield, PA
- Average snowfall in December: 2.44"
The month with the highest snowfall is January (2.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Smithfield, PA
- Average snowfall days in December: 11.4 days
The month with the highest number of snowfall days is January (16.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Smithfield, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
Smithfield, PA
- Average sunshine days in December: 13.2 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is January (9.1 days).
Average UV index in December
Smithfield, PA
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Smithfield, PA
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Smithfield, 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).
Smithfield, Pennsylvania, USA
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