December weather forecast
Catonsville, MD

Share

Weather in December

December, the first month of the winter in Catonsville, is still a chilly month, with an average temperature varying between 32.9°F (0.5°C) and 44.1°F (6.7°C).

Temperature

The transition to December results in a modest reduction in average high-temperature, moving from a cool 53.1°F (11.7°C) in November to a chilly 44.1°F (6.7°C). During the month of December, Catonsville experiences a steady low-temperature average of 32.9°F (0.5°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In Catonsville, during December, the rain falls for 11.8 days and regularly aggregates up to 2.6" (66mm) of precipitation. Throughout the year, there are 165.5 rainfall days, and 31.65" (804mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In December, it is snowing for 2.9 days. Throughout December, 1.22" (31mm) of snow is accumulated. In Catonsville, during the entire year, snow falls for 16.6 days and aggregates up to 7.8" (198mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:08 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:54 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 unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 2 in December translates into these instructions:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

During December, Catonsville experiences an average high-temperature of 44.1°F (6.7°C) and a low-temperature of 32.9°F (0.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines air temperature and relative humidity, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In Catonsville, the average relative humidity in December is 76%.

How many days does it rain in December?

In Catonsville, in December, it is raining for 11.8 days, with typically 2.6" (66mm) of accumulated precipitation.

How much does it snow in December?

In December, in Catonsville, it is snowing for 2.9 days. Throughout December, 1.22" (31mm) of snow is accumulated.

What is the month with the shortest days?

With an average of 9h and 30min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In December, the average day length is 9h and 28min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:08 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:54 pm EST.

How long on average sun shines in December in Catonsville?

In December, the average sunshine duration is 5.2h.

What is the month with 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 Catonsville?

In Catonsville, Maryland, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe 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
Catonsville, MD

Average temperature in December - Catonsville, MD
  • Average high temperature in December: 44.1°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.1°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).

Average pressure in December
Catonsville, MD

Average pressure in December - Catonsville, 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
Catonsville, MD

Average wind speed in December - Catonsville, MD
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Catonsville, MD

Average humidity in December - Catonsville, MD
  • Average humidity in December: 76%

The months with the highest relative humidity are May and October (77%).
The month with the lowest relative humidity is July (71%).

Average rainfall in December
Catonsville, MD

Average rainfall in December - Catonsville, MD
  • Average rainfall in December: 2.6"

The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in December
Catonsville, MD

Average rainfall days in December - Catonsville, MD
  • Average rainfall days in December: 11.8 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (9.7 days).

Average snowfall in December
Catonsville, MD

Average snowfall in December - Catonsville, MD
  • Average snowfall in December: 1.22"

The month with the highest snowfall is January (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Catonsville, MD

Average snowfall days in December - Catonsville, MD
  • Average snowfall days in December: 2.9 days

The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Catonsville, MD
  • Average daylight in December: 9h and 3min

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 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

Average sunshine days in December
Catonsville, MD

Average sunshine days in December - Catonsville, MD
  • Average sunshine days in December: 16.2 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10.4 days).

Average UV index in December
Catonsville, MD

Average UV index in December - Catonsville, 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
Catonsville, MD

Average cloud cover in December - Catonsville, MD
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).

Average visibility in December
Catonsville, MD

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

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

Catonsville, Maryland, USA

Weather forecast for your location

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