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
The onset of December entails a subtle temperature shift, as the average high-temperature eases from a cool 51.3°F (10.7°C) in November to a wintry 42.6°F (5.9°C). In December, Runnymeade Summit records an average nighttime temperature of 30.4°F (-0.9°C).Humidity
In December, the average relative humidity in Runnymeade Summit is 79%.Rainfall
In Runnymeade Summit, during December, the rain falls for 9.8 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Runnymeade Summit, during the entire year, the rain falls for 157.5 days and collects up to 27.52" (699mm) of precipitation.Snowfall
Months with snowfall in Runnymeade Summit are January through May, October through December. In Runnymeade Summit, during December, snow falls for 3.9 days and regularly aggregates up to 1.57" (40mm) of snow. In Runnymeade Summit, during the entire year, snow falls for 22.3 days and aggregates up to 9.76" (248mm) of snow.Daylight
December has the shortest days of the year in Runnymeade Summit, with an average of 9h and 24min of daylight.On the first day of December in Runnymeade Summit, sunrise is at 7:10 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:54 pm EST.
Sunshine
The average sunshine in December in Runnymeade Summit is 5h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Runnymeade Summit. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: In December, a regular UV index of 2 translates into these guidelines:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Always opt for UVA and UVB-resistant sunglasses on radiant days. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
How cold is it in Runnymeade Summit in December?
What is the average humidity in December in Runnymeade Summit?
How many days does it rain in December in Runnymeade Summit?
How many days does it snow in December in Runnymeade Summit?
What is the month with the shortest days in Runnymeade Summit?
How many hours of daylight does Runnymeade Summit have in December?
What time are sunrise and sunset in December in Runnymeade Summit?
How many hours of sunshine does Runnymeade Summit have in December?
When is the lowest UV index in Runnymeade Summit?
What is the UV index intensity in December in Runnymeade Summit?
Average temperature in December
Runnymeade Summit, MD
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in December: 30.4°F
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).
Average pressure in December
Runnymeade Summit, 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 (29.95"Hg).
Average wind speed in December
Runnymeade Summit, MD
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (5mph).
Average humidity in December
Runnymeade Summit, MD
- Average humidity in December: 79%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Runnymeade Summit, MD
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is August (3.23").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in December
Runnymeade Summit, MD
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in December
Runnymeade Summit, MD
- Average snowfall in December: 1.57"
The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Runnymeade Summit, MD
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Runnymeade Summit, 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 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in December
Runnymeade Summit, MD
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Runnymeade Summit, 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
Runnymeade Summit, MD
- Average cloud cover in December: 47
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 31).
Average visibility in December
Runnymeade Summit, MD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Runnymeade Summit, Maryland, USA
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