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 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
December implies a soft temperature shift, with average high-temperatures reducing from November's fresh 52.2°F (11.2°C) to a frosty 43.2°F (6.2°C). In the month of December, Johnsville records a consistent average low-temperature of 31.3°F (-0.4°C).Humidity
In December, the average relative humidity in Johnsville is 78%.Rainfall
In December, the rain falls for 9.1 days. Throughout December, 1.02" (26mm) of precipitation is accumulated. In Johnsville, during the entire year, the rain falls for 130.3 days and collects up to 15.47" (393mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In December, in Johnsville, it is snowing for 2.5 days. Throughout December, 0.47" (12mm) of snow is accumulated. In Johnsville, Maryland, during the entire year, snow falls for 16 days and aggregates up to 4.13" (105mm) of snow.Daylight
The month with the shortest days in Johnsville is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:10 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:55 pm EST.
Sunshine
In Johnsville, the average sunshine in December is 5h.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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
How cold does it get in Johnsville in December?
What is the average humidity in December in Johnsville?
How much does it rain in Johnsville in December?
How much does it snow in Johnsville in December?
What is the month with the shortest days in Johnsville?
How many hours of daylight does Johnsville have in December?
What time are sunrise and sunset in December in Johnsville?
How long on average sun shines in December in Johnsville?
What are the months with the lowest UV index in Johnsville?
What is the UV index reading in December in Johnsville?
Average temperature in December
Johnsville, MD
- Average high temperature in December: 43.2°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 (37.6°F).
- Average low temperature in December: 31.3°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure in December
Johnsville, 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
Johnsville, MD
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is March (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Johnsville, MD
- Average humidity in December: 78%
The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January, April, July and November (75%).
Average rainfall in December
Johnsville, MD
- Average rainfall in December: 1.02"
The wettest month (with the highest rainfall) is August (2.48").
The driest month (with the least rainfall) is February (0.79").
Average rainfall days in December
Johnsville, MD
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is August (15.1 days).
The months with the least rainy days are January and February (6.8 days).
Average snowfall in December
Johnsville, MD
- Average snowfall in December: 0.47"
The month with the highest snowfall is January (1.34").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Johnsville, MD
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is February (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
Johnsville, 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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Johnsville, MD
- Average sunshine days in December: 19.3 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is May (12.9 days).
Average UV index in December
Johnsville, 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
Johnsville, MD
- Average cloud cover in December: 46
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Johnsville, MD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Johnsville, Maryland, USA
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