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
As November transitions into December, Merrian sees a drop in the average high-temperature, transitioning from a chilly 47.8°F (8.8°C) to an icy 38.3°F (3.5°C). Throughout December, Merrian encounters an average temperature drop to a subzero cold 27.7°F (-2.4°C).Humidity
The average relative humidity in December is 81%.Rainfall
In Merrian, Pennsylvania, during December, the rain falls for 8.3 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Merrian, during the entire year, the rain falls for 129.2 days and collects up to 16.42" (417mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Merrian, during December, snow falls for 5.5 days and regularly aggregates up to 1.06" (27mm) of snow. In Merrian, during the entire year, snow falls for 28.6 days and aggregates up to 9.37" (238mm) of snow.Daylight
The month with the shortest days in Merrian is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:11 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:29 am and sunset at 4:48 pm EST.
Sunshine
In December, the average sunshine in Merrian is 4.3h.UV index
The months with the lowest UV index in Merrian are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. To guard against the harmful effects of the Sun, minimize exposure during midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Merrian in December?
What is the average humidity in December in Merrian?
How much does it rain in Merrian in December?
How much does it snow in Merrian in December?
What is the month with the shortest days in Merrian?
How many hours of daylight does Merrian have in December?
When is the sunrise / sunset in December in Merrian?
How long on average sun shines in December in Merrian?
What is the month with the lowest UV index in Merrian?
What is the UV index reading in December in Merrian?
Average temperature in December
Merrian, PA
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 27.7°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure in December
Merrian, PA
- Average pressure in December: 30.1"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
Merrian, PA
- Average wind speed in December: 7.6mph
The windiest months (with the highest average wind speed) are March and April (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Merrian, PA
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are March and April (77%).
Average rainfall in December
Merrian, PA
- Average rainfall in December: 1.1"
The wettest months (with the highest rainfall) are May and July (1.97").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in December
Merrian, PA
- Average rainfall days in December: 8.3 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in December
Merrian, PA
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Merrian, PA
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Merrian, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in December
Merrian, PA
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (12.5 days).
Average UV index in December
Merrian, PA
- Average UV index in December: 2
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Merrian, PA
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Merrian, PA
- Average visibility in December: 6mi
The months with the highest visibility are March, April, November and December (6mi).
The months with the lowest visibility are January, February, May, June, July, August, September and October (5mi).
Merrian, Pennsylvania, USA
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