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
Transition from November to December is accompanied by a temperature drop, with average high-temperatures decreasing from a frosty 48.6°F (9.2°C) to an icy 38.7°F (3.7°C). Throughout December in Sewickley Hills, a steady low-temperature average of 28°F (-2.2°C) is noted.Humidity
The average relative humidity in December in Sewickley Hills, Pennsylvania, is 84%.Rainfall
In Sewickley Hills, during December, the rain falls for 6.6 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, in Sewickley Hills, there are 104.1 rainfall days, and 8.23" (209mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Sewickley Hills, in December, snow falls for 6.4 days, with typically accumulated 0.67" (17mm) of snow. Throughout the year, in Sewickley Hills, there are 33.9 snowfall days, and 4.37" (111mm) of snow is accumulated.Daylight
December has the shortest days of the year in Sewickley Hills, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:25 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:03 pm EST.
Sunshine
The average sunshine in December in Sewickley Hills, Pennsylvania, is 3.2h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 1 transforms into these recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
How cold does it get in Sewickley Hills in December?
What is the average humidity in December in Sewickley Hills?
How much does it rain in Sewickley Hills in December?
How much does it snow in Sewickley Hills in December?
What is the month with the shortest days in Sewickley Hills?
What is the average length of the day in December in Sewickley Hills?
What time are sunrise and sunset in December in Sewickley Hills?
How long on average sun shines in December in Sewickley Hills?
What is the month with the lowest UV index in Sewickley Hills?
How high is the UV index in December in Sewickley Hills?
Average temperature in December
Sewickley Hills, PA
- Average high temperature in December: 38.7°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 28°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Sewickley Hills, 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 (29.94"Hg).
Average wind speed in December
Sewickley Hills, 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 (4.8mph).
Average humidity in December
Sewickley Hills, PA
- Average humidity in December: 84%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are July and August (75%).
Average rainfall in December
Sewickley Hills, PA
- Average rainfall in December: 0.67"
The wettest months (with the highest rainfall) are June and July (0.91").
The driest months (with the least rainfall) are January and November (0.47").
Average rainfall days in December
Sewickley Hills, PA
- Average rainfall days in December: 6.6 days
The month with the highest number of rainy days is May (12.7 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in December
Sewickley Hills, PA
- Average snowfall in December: 0.67"
The month with the highest snowfall is February (1.18").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sewickley Hills, PA
- Average snowfall days in December: 6.4 days
The month with the highest number of snowfall days is February (9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sewickley Hills, 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 12min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in December
Sewickley Hills, PA
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is May (14.7 days).
Average UV index in December
Sewickley Hills, PA
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Sewickley Hills, 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
Sewickley Hills, PA
- Average visibility in December: 5mi
The months with the highest visibility are April, June, August and November (6mi).
The months with the lowest visibility are January, February, March, May, July, September, October and December (5mi).
Sewickley Hills, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location
