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
In December, the average high-temperature goes from a chilly 48.6°F (9.2°C) in November to a wintry 38.7°F (3.7°C). During December, Sewickley Heights observes a consistent average nighttime temperature of 28°F (-2.2°C).Humidity
The average relative humidity in December is 84%.Rainfall
In Sewickley Heights, Pennsylvania, in December, during 6.6 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, in Sewickley Heights, Pennsylvania, there are 104.1 rainfall days, and 8.23" (209mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Sewickley Heights, during December, snow falls for 6.4 days and regularly aggregates up to 0.67" (17mm) of snow. Throughout the year, in Sewickley Heights, there are 33.9 snowfall days, and 4.37" (111mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of December in Sewickley Heights, sunrise is at 7:25 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:03 pm EST.
Sunshine
The average sunshine in December in Sewickley Heights is 3.2h.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 minimal health hazard from exposure to the Sun's UV rays for the ordinary person.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Frequently asked questions
How cold is it in Sewickley Heights in December?
What is the average humidity in December in Sewickley Heights?
How much does it rain in Sewickley Heights in December?
How many days does it snow in December in Sewickley Heights?
What is the month with the shortest days in Sewickley Heights?
What is the average length of the day in December in Sewickley Heights?
What time are sunrise and sunset in December in Sewickley Heights?
How long on average sun shines in December in Sewickley Heights?
When is the lowest UV index in Sewickley Heights?
How high is the UV index in December in Sewickley Heights?
Average temperature in December
Sewickley Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, Pennsylvania, USA
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