December weather forecast
Relay, MD

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Weather in December

December, the first month of the winter in Relay, is still a chilly month, with an average temperature fluctuating between 45.5°F (7.5°C) and 34.2°F (1.2°C).

Temperature

December ushers in a minute temperature change, with average high-temperatures reducing from November's fresh 53.4°F (11.9°C) to a frosty 45.5°F (7.5°C). Relay's December nights cool down to an average low-temperature of 34.2°F (1.2°C).

Humidity

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

Rainfall

In Relay, during December, the rain falls for 10 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, there are 156.5 rainfall days, and 29.8" (757mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Relay are January through March, November and December. In Relay, during December, snow falls for 2.2 days and regularly aggregates up to 0.79" (20mm) of snow. In Relay, during the entire year, snow falls for 12.8 days and aggregates up to 6.77" (172mm) of snow.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:07 am and sunset at 4:44 pm. On the last day of December, in Relay, sunrise is at 7:26 am and sunset at 4:54 pm EST.

Sunshine

With an average of 5h of sunshine, December has the least sunshine of the year in Relay.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Relay. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 2 suggests these recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
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Frequently asked questions

What is the usual temperature for Relay in December?

In December, in Relay, the average high-temperature is 45.5°F (7.5°C), and the average low-temperature is 34.2°F (1.2°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, is estimated at 91.4°F (33°C).

What is the average humidity in December in Relay?

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

How much does it rain in Relay in December?

In Relay, in December, during 10 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.

How much does it snow in Relay in December?

In December, it is snowing for 2.2 days. Throughout December, 0.79" (20mm) of snow is accumulated.

What is the month with the shortest days in Relay?

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

How many hours of daylight does Relay have in December?

The average day length in December in Relay is 9h and 28min.

What time are sunrise and sunset in December in Relay?

On the first day of December in Relay, sunrise is at 7:07 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.

What is the month with the least sunshine in Relay?

December has the least sunshine of the year, with an average of 5h of sunshine.

How long on average sun shines in December in Relay?

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

What is the month with the lowest UV index in Relay?

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 in Relay?

The average daily maximum UV index in December in Relay is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
53.4°F 11.9°C
45.5°F 7.5°C
38.8°F 3.8°C
Average low temperature
40.3°F 4.6°C
34.2°F 1.2°C
27.3°F -2.6°C
Average pressure
30.14" 766mmHg
30.11" 765mmHg
30.1" 765mmHg
Average wind speed
8.1mph 13km/h
8.3mph 13.4km/h
8.9mph 14.3km/h
Average max. wind speed
8.8mph 14.2km/h
9mph 14.5km/h
9.7mph 15.6km/h
Average wind speed gusts
13.1mph 21.1km/h
13.2mph 21.2km/h
14.2mph 22.9km/h
Average humidity
73%
76%
73%
Average rainfall
1.97" 50mm
2.28" 58mm
1.77" 45mm
Average rainfall days
8.7
10
8.6
Average snowfall
0.04" 1mm
0.79" 20mm
2.24" 57mm
Average snowfall days
0.3
2.2
3.8
Average daylight
10h 0min
9h 3min
9h 5min
Average sunshine
5h 4min
5h 0min
5h 1min
Average sunshine days
19.9
18.5
18.8
Average UV index
2
2
2
Average cloud cover
35%
44%
42%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Relay, MD

Average temperature in December - Relay, MD
  • Average high temperature in December: 45.5°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 (38.8°F).

  • Average low temperature in December: 34.2°F

The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).

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Average pressure in December
Relay, MD

Average pressure in December - Relay, 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).

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Average wind speed in December
Relay, MD

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

The windiest months (with the highest average wind speed) are February and March (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in December
Relay, MD

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

The month with the highest relative humidity is May (77%).
The months with the lowest relative humidity are April and July (72%).

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Average rainfall in December
Relay, MD

Average rainfall in December - Relay, MD
  • Average rainfall in December: 2.28"

The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is January (1.77").

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Average rainfall days in December
Relay, MD

Average rainfall days in December - Relay, MD
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (8.6 days).

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Average snowfall in December
Relay, MD

Average snowfall in December - Relay, MD
  • Average snowfall in December: 0.79"

The month with the highest snowfall is January (2.24").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Relay, MD

Average snowfall days in December - Relay, MD
  • Average snowfall days in December: 2.2 days

The month with the highest number of snowfall days is February (3.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

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

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).

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Average sunshine days in December
Relay, MD

Average sunshine days in December - Relay, MD
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is July (10.9 days).

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Average UV index in December
Relay, MD

Average UV index in December - Relay, 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).

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Average cloud cover in December
Relay, MD

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

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in December
Relay, MD

Average visibility in December - Relay, 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).

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Relay, Maryland, USA

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