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
The shift from November to December coincides with a small decrease in the average high-temperature, down to a cold 42.3°F (5.7°C) from a fresh 51.1°F (10.6°C). In Merlin, an average nighttime temperature of 30.9°F (-0.6°C) is expected during December.Humidity
In December, the average relative humidity in Merlin is 79%.Rainfall
In Merlin, in December, it is raining for 7.9 days, with typically 0.98" (25mm) of accumulated precipitation. Throughout the year, in Merlin, there are 132.3 rainfall days, and 13.98" (355mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall in Merlin. In Merlin, during December, snow falls for 2.5 days and regularly aggregates up to 0.51" (13mm) of snow. In Merlin, during the entire year, snow falls for 15.1 days and aggregates up to 2.2" (56mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Merlin.On the first day of December in Merlin, sunrise is at 7:05 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:46 pm EST.
Sunshine
In Merlin, the average sunshine in December is 4.8h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Merlin. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 in December translates into this advice:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
Is it cold in Merlin during December?
What is the average humidity in December in Merlin?
How many days does it rain in December in Merlin?
How much does it snow in Merlin in December?
What is the month with the shortest days in Merlin?
What is the average length of the day in December in Merlin?
What time are sunrise and sunset in December in Merlin?
How many hours of sunshine does Merlin have in December?
When is the lowest UV index in Merlin?
What is the UV index reading in December in Merlin?
Average temperature in December
Merlin, PA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).
Average pressure in December
Merlin, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Merlin, PA
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Merlin, PA
- Average humidity in December: 79%
The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Merlin, PA
- Average rainfall in December: 0.98"
The wettest month (with the highest rainfall) is August (1.77").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in December
Merlin, PA
- Average rainfall days in December: 7.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (6.9 days).
Average snowfall in December
Merlin, PA
- Average snowfall in December: 0.51"
The months with the highest snowfall are January and February (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Merlin, PA
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is February (4.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Merlin, 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 24min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Merlin, PA
- Average sunshine days in December: 20.4 days
The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is June (12.8 days).
Average UV index in December
Merlin, PA
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (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
Merlin, PA
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Merlin, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Merlin, Pennsylvania, USA
Weather forecast for your location
2. Allow the app to use your location