December weather forecast
Patapsco, MD

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Weather in December

December, the first month of the winter in Patapsco, is also a frosty month, with an average temperature fluctuating between 42.8°F (6°C) and 30.4°F (-0.9°C).

Temperature

A subtle change in temperatures is noted as November gives way to December, with average highs reducing from a cool 51.3°F (10.7°C) to a frosty 42.8°F (6°C). Patapsco, during the month of December, experiences an average low-temperature of 30.4°F (-0.9°C).

Humidity

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

Rainfall

In December, the rain falls for 11 days. Throughout December, 2.4" (61mm) of precipitation is accumulated. In Patapsco, during the entire year, the rain falls for 158.9 days and collects up to 32.68" (830mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In December, it is snowing for 3.9 days. Throughout December, 1.93" (49mm) of snow is accumulated. Throughout the year, there are 23.9 snowfall days, and 13.31" (338mm) 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 in Patapsco, sunrise is at 7:09 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:53 pm EST.

Sunshine

The average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

In December, in Patapsco, the average high-temperature is 42.8°F (6°C), and the average low-temperature is 30.4°F (-0.9°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is calculated to be 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 79%.

How much does it rain in December?

In Patapsco, in December, it is raining for 11 days, with typically 2.4" (61mm) of accumulated precipitation.

How many days does it snow in December in Patapsco?

In Patapsco, during December, snow falls for 3.9 days and regularly aggregates up to 1.93" (49mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

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

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:53 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.9h.

What are the months with the lowest UV index?

January, February, 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?

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 the Sun's UV radiation.
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
Patapsco, MD

Average temperature in December - Patapsco, MD
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in December: 30.4°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure in December
Patapsco, MD

Average pressure in December - Patapsco, MD
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Patapsco, MD

Average wind speed in December - Patapsco, MD
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Patapsco, MD

Average humidity in December - Patapsco, MD
  • Average humidity in December: 79%

The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are January, April, July and November (76%).

Average rainfall in December
Patapsco, MD

Average rainfall in December - Patapsco, MD
  • Average rainfall in December: 2.4"

The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is February (2.13").

Average rainfall days in December
Patapsco, MD

Average rainfall days in December - Patapsco, MD
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in December
Patapsco, MD

Average snowfall in December - Patapsco, MD
  • Average snowfall in December: 1.93"

The month with the highest snowfall is March (4.06").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Patapsco, MD

Average snowfall days in December - Patapsco, MD
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is January (6.9 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
Patapsco, MD

Average daylight in December / Average sunshine in December - Patapsco, 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: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in December
Patapsco, MD

Average sunshine days in December - Patapsco, MD
  • Average sunshine days in December: 17.1 days

The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is July (11.6 days).

Average UV index in December
Patapsco, MD

Average UV index in December - Patapsco, 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
Patapsco, MD

Average cloud cover in December - Patapsco, MD
  • Average cloud cover in December: 48

The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Patapsco, MD

Average visibility in December - Patapsco, MD
  • 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).

Patapsco, Maryland, USA

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