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 is marked by a subtle drop in average high-temperatures, transitioning from a cool 53.1°F (11.7°C) in November to a frosty 44.1°F (6.7°C). Saint Johns Green temperatures generally rest at a low of 32.9°F (0.5°C) during the December nights.Humidity
In Saint Johns Green, the average relative humidity in December is 76%.Rainfall
In Saint Johns Green, in December, during 11.8 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Saint Johns Green, during the entire year, the rain falls for 165.5 days and collects up to 31.65" (804mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Saint Johns Green, in December, during 2.9 snowfall days, 1.22" (31mm) of snow is typically accumulated. Throughout the year, in Saint Johns Green, Maryland, there are 16.6 snowfall days, and 7.8" (198mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December in Saint Johns Green, 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.
Sunshine
The average sunshine in December in Saint Johns Green 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 in Saint Johns Green. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
How cold does it get in Saint Johns Green in December?
What is the average humidity in December in Saint Johns Green?
How many days does it rain in December in Saint Johns Green?
How many days does it snow in December in Saint Johns Green?
What is the month with the shortest days in Saint Johns Green?
What is the average length of the day in December in Saint Johns Green?
What time are sunrise and sunset in December in Saint Johns Green?
How long on average sun shines in December in Saint Johns Green?
What is the month with the lowest UV index in Saint Johns Green?
What is the UV index reading in December in Saint Johns Green?
Average temperature in December
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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
Saint Johns Green, 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).
Saint Johns Green, Maryland, USA
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