Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December is marked by a minor reduction in average high-temperature, sliding from a cool 53.8°F (12.1°C) in November to a frosty 45.5°F (7.5°C). In Rock Hall, an average temperature of 34.9°F (1.6°C) is noted during December nights.Humidity
The average relative humidity in December is 76%.Rainfall
In Rock Hall, in December, during 7.8 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. In Rock Hall, during the entire year, the rain falls for 120.1 days and collects up to 12.87" (327mm) of precipitation.Snowfall
January through April and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 1.5 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 9.8 snowfall days, and 2.01" (51mm) of snow is accumulated.Ocean temperature
In Rock Hall, in December, the average water temperature is 50.5°F (10.3°C).Note: It is advised against swimming in 50.5°F (10.3°C) when it drops below 50°F (10°C). Such temperatures can cause extreme cold shock, leading to hyperventilation.
Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of December in Rock Hall, sunrise is at 7:05 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:52 pm EST.
Sunshine
In Rock Hall, Maryland, the average sunshine in December is 5.2h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Rock Hall in December?
What is the average humidity in December?
How much does it rain in Rock Hall in December?
When does it start snowing?
How cold is the water in December?
What is the month with the shortest days?
How many hours of daylight does Rock Hall have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Rock Hall, MD
- Average high temperature in December: 45.5°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (39.2°F).
- Average low temperature in December: 34.9°F
The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).
Average pressure in December
Rock Hall, MD
- Average pressure in December: 30.11"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
Rock Hall, MD
- Average wind speed in December: 9mph
The windiest months (with the highest average wind speed) are January, February and March (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Rock Hall, MD
- Average humidity in December: 76%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is November (73%).
Average rainfall in December
Rock Hall, MD
- Average rainfall in December: 1.02"
The wettest months (with the highest rainfall) are July and August (1.81").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in December
Rock Hall, MD
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is July (14.6 days).
The month with the least rainy days is November (5.6 days).
Average snowfall in December
Rock Hall, MD
- Average snowfall in December: 0.12"
The month with the highest snowfall is January (0.83").
The months with the least snowfall are May, June, July, August, September, October and November (0").
Average snowfall days in December
Rock Hall, MD
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Rock Hall, MD
- Average sea temperature in December: 50.6°F
The best month for swimming (with the highest average sea temperature) is August (77.2°F).
The coldest month (with the lowest average sea temperature) is February (43.7°F).
Average daylight in December /
Average sunshine in December
Rock Hall, 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 54min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in December
Rock Hall, MD
- Average sunshine days in December: 21 days
The months with the most sunshine days are January and November (21.9 days).
The month with the least sunshine days is July (14.1 days).
Average UV index in December
Rock Hall, 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 and December (UV index 2).
Average cloud cover in December
Rock Hall, MD
- Average cloud cover in December: 44
The months with the most cloud cover are February, March and December (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Rock Hall, 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).
Rock Hall, Maryland, USA
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