December weather forecast
Merlin, PA

Share

Weather in December

The first month of the winter, December, is still a cold month in Merlin, Pennsylvania, with an average temperature fluctuating between 30.9°F (-0.6°C) and 42.3°F (5.7°C).

Temperature

In December, the average high-temperature marginally decreases from a cool 51.1°F (10.6°C) in November to a wintry 42.3°F (5.7°C). An average low-temperature of 30.9°F (-0.6°C) is noted during the nights in December.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In December, the rain falls for 7.9 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. Throughout the year, 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, 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

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:37 pm. On the last day of December, 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

The months with the lowest UV index 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 minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 2 during December translates into the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Direct Sun exposure should be minimized especially during midday when radiation is most intense. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

How cold is it in December?

The high-temperature during December is 42.3°F (5.7°C) and the low-temperature is 30.9°F (-0.6°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is evaluated at 89.6°F (32°C).

What is the average humidity in December?

In Merlin, the average relative humidity in December is 79%.

How much does it rain in December?

In December, the rain falls for 7.9 days. Throughout December, 0.98" (25mm) of precipitation is accumulated.

How much does it snow in Merlin in December?

In December, it is snowing for 2.5 days. Throughout December, 0.51" (13mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In Merlin, the average day length in December is 9h and 23min.

When are sunrise and sunset in December?

On the first day of December, 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.

How long on average sun shines in December?

In December, the average sunshine duration is 4.8h.

What is the month with the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December?

In Merlin, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Merlin, PA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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

1. Click Locate me button
2. Allow the app to use your location