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
McKees Rocks, Pennsylvania, in December undergoes a mild reduction in the average high-temperature, shifting from November's chilly 49.1°F (9.5°C) to a cold 39.4°F (4.1°C). McKees Rocks records an average nighttime low of 28.4°F (-2°C) in December.Humidity
The average relative humidity in December is 83%.Rainfall
In McKees Rocks, in December, it is raining for 10.5 days, with typically 2.13" (54mm) of accumulated precipitation. In McKees Rocks, Pennsylvania, during the entire year, the rain falls for 163.6 days and collects up to 26.93" (684mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In McKees Rocks, during December, snow falls for 10.3 days and regularly aggregates up to 2.01" (51mm) of snow. In McKees Rocks, during the entire year, snow falls for 47.7 days and aggregates up to 11.77" (299mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:24 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
In McKees Rocks, the average sunshine in December is 3.2h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 1 during December translates into the following directions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. When the Sun is at its strongest around midday, find shade and limit exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it cold during December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does McKees Rocks have in December?
What time are sunrise and sunset in December in McKees Rocks?
How long on average sun shines in December?
When is the lowest UV index in McKees Rocks?
How high is the UV index in December?
Average temperature in December
McKees Rocks, PA
- Average high temperature in December: 39.4°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.1°F).
- Average low temperature in December: 28.4°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure in December
McKees Rocks, 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
McKees Rocks, 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
McKees Rocks, PA
- Average humidity in December: 83%
The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in December
McKees Rocks, PA
- Average rainfall in December: 2.13"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.54").
Average rainfall days in December
McKees Rocks, PA
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (8.9 days).
Average snowfall in December
McKees Rocks, PA
- Average snowfall in December: 2.01"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
McKees Rocks, PA
- Average snowfall days in December: 10.3 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
McKees Rocks, 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 48min).
Average sunshine days in December
McKees Rocks, PA
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (9.6 days).
Average UV index in December
McKees Rocks, PA
- Average UV index in December: 1
The months with the highest UV index are May, June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
McKees Rocks, 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
McKees Rocks, PA
- Average visibility in December: 5mi
The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).
McKees Rocks, Pennsylvania, USA
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