December weather forecast
Perryman, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Perryman, Maryland, with an average temperature varying between 44.4°F (6.9°C) and 33.1°F (0.6°C).

Temperature

In Perryman, the average high-temperature in December slightly decreases from a cool 53.1°F (11.7°C) in November to a frosty 44.4°F (6.9°C). Perryman's average low-temperature is measured at a cold 33.1°F (0.6°C) during December.

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Perryman, during December, the rain falls for 9.5 days and regularly aggregates up to 2.44" (62mm) of precipitation. In Perryman, during the entire year, the rain falls for 153 days and collects up to 30.39" (772mm) of precipitation.

Snowfall

Months with snowfall are January through March, May, November and December. In Perryman, during December, snow falls for 1.8 days and regularly aggregates up to 0.87" (22mm) of snow. Throughout the year, there are 12.7 snowfall days, and 6.85" (174mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:51 pm EST.

Sunshine

The average sunshine in December is 5.2h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature during December is 44.4°F (6.9°C) and the low-temperature is 33.1°F (0.6°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is appraised at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How much does it rain in December?

In Perryman, in December, during 9.5 rainfall days, 2.44" (62mm) of precipitation is typically accumulated.

How much does it snow in December?

In Perryman, in December, snow falls for 1.8 days, with typically accumulated 0.87" (22mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In Perryman, the average day length in December is 9h and 26min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:06 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:51 pm EST.

How long on average sun shines in December in Perryman?

The average sunshine duration in December is 5.2h.

When is the lowest UV index?

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

What is the UV index reading in December?

In Perryman, Maryland, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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
Perryman, MD

Average temperature in December - Perryman, MD
  • Average high temperature in December: 44.4°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in December: 33.1°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).

Average pressure in December
Perryman, MD

Average pressure in December - Perryman, MD
  • 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
Perryman, MD

Average wind speed in December - Perryman, MD
  • Average wind speed in December: 8.3mph

The windiest months (with the highest average wind speed) are February and March (9mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Perryman, MD

Average humidity in December - Perryman, MD
  • Average humidity in December: 77%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are March, April and November (74%).

Average rainfall in December
Perryman, MD

Average rainfall in December - Perryman, MD
  • Average rainfall in December: 2.44"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (1.85").

Average rainfall days in December
Perryman, MD

Average rainfall days in December - Perryman, MD
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in December
Perryman, MD

Average snowfall in December - Perryman, MD
  • Average snowfall in December: 0.87"

The month with the highest snowfall is January (2.17").
The months with the least snowfall are April, June, July, August, September and October (0").

Average snowfall days in December
Perryman, MD

Average snowfall days in December - Perryman, MD
  • Average snowfall days in December: 1.8 days

The month with the highest number of snowfall days is January (4.2 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Perryman, MD

Average daylight in December / Average sunshine in December - Perryman, MD
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in December
Perryman, MD

Average sunshine days in December - Perryman, MD
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (10.9 days).

Average UV index in December
Perryman, MD

Average UV index in December - Perryman, MD
  • 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, November and December (UV index 2).

Average cloud cover in December
Perryman, MD

Average cloud cover in December - Perryman, MD
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Perryman, MD

Average visibility in December - Perryman, MD
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Perryman, Maryland, USA

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