December weather forecast
Riderwood, MD

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Weather in December

December, the first month of the winter in Riderwood, is also a frosty month, with an average temperature ranging between max 43.9°F (6.6°C) and min 33.1°F (0.6°C).

Temperature

In the transition to December, Riderwood observes a drop in the average high-temperature, moving from a fresh 52.9°F (11.6°C) in November to a chilly 43.9°F (6.6°C). Riderwood's temperature tends to fall to an average low of 33.1°F (0.6°C) during the nights of December.

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Riderwood, in December, during 7 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 102.3 rainfall days, and 9.25" (235mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Riderwood, during December, snow falls for 2 days and regularly aggregates up to 0.24" (6mm) of snow. In Riderwood, during the entire year, snow falls for 12.1 days and aggregates up to 1.81" (46mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:08 am and sunset at 4:43 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:53 pm EST.

Sunshine

In Riderwood, the average sunshine in December is 5h.

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 minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.

Frequently asked questions

How cold does it get in December?

An average high-temperature, in December, in Riderwood, is 43.9°F (6.6°C) and the average low-temperature is 33.1°F (0.6°C). In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, is evaluated at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December in Riderwood is 77%.

How much does it rain in December?

In December, the rain falls for 7 days. Throughout December, 0.75" (19mm) of precipitation is accumulated.

How much does it snow in December?

In Riderwood, during December, snow falls for 2 days and regularly aggregates up to 0.24" (6mm) 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.

How many hours of daylight does Riderwood have in December?

In December, the average day length is 9h and 27min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:08 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:53 pm EST.

How long on average sun shines in December?

In Riderwood, the average sunshine duration in December is 5h.

What is the month 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 in Riderwood is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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
Riderwood, MD

Average temperature in December - Riderwood, MD
  • Average high temperature in December: 43.9°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in December: 33.1°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

Average pressure in December
Riderwood, MD

Average pressure in December - Riderwood, 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
Riderwood, MD

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

The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in December
Riderwood, MD

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

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December
Riderwood, MD

Average rainfall in December - Riderwood, MD
  • Average rainfall in December: 0.75"

The wettest month (with the highest rainfall) is August (1.46").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in December
Riderwood, MD

Average rainfall days in December - Riderwood, MD
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is July (12.6 days).
The month with the least rainy days is January (5.2 days).

Average snowfall in December
Riderwood, MD

Average snowfall in December - Riderwood, MD
  • Average snowfall in December: 0.24"

The month with the highest snowfall is January (0.55").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Riderwood, MD

Average snowfall days in December - Riderwood, MD
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is February (3.8 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
Riderwood, MD

Average daylight in December / Average sunshine in December - Riderwood, 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 0min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in December
Riderwood, MD

Average sunshine days in December - Riderwood, MD
  • Average sunshine days in December: 21.9 days

The month with the most sunshine days is November (22.9 days).
The month with the least sunshine days is July (15.2 days).

Average UV index in December
Riderwood, MD

Average UV index in December - Riderwood, 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
Riderwood, MD

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

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Riderwood, MD

Average visibility in December - Riderwood, 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).

Riderwood, Maryland, USA

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