December weather forecastChestnut Hill, MD
December
Weather in December
The first month of the winter, December, is still a chilly month in Chestnut Hill, Maryland, with an average temperature fluctuating between 43.9°F (6.6°C) and 33.1°F (0.6°C).Temperature
Chestnut Hill's December weather features a mild decline in high-temperatures, reducing from a cool 52.9°F (11.6°C) in November to a chilly 43.9°F (6.6°C). Chestnut Hill records a consistent low-temperature of 33.1°F (0.6°C) during December nights.Humidity
In Chestnut Hill, the average relative humidity in December is 77%.Rainfall
In December, the rain falls for 7 days. Throughout December, 0.75" (19mm) of precipitation is accumulated. Throughout the year, there are 102.3 rainfall days, and 9.25" (235mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Chestnut Hill, Maryland, in December, snow falls for 2 days, with typically accumulated 0.24" (6mm) of snow. Throughout the year, in Chestnut Hill, there are 12.1 snowfall days, and 1.81" (46mm) 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 the month, sunrise is at 7:08 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:54 pm EST.
Sunshine
In Chestnut Hill, 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 low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: An average UV index of 2 in December transforms into this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Chestnut Hill, MD
- Average high temperature in December: 43.9°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure in December
Chestnut Hill, 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
Chestnut Hill, MD
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in December
Chestnut Hill, MD
- Average humidity in December: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Chestnut Hill, MD
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is August (1.46").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in December
Chestnut Hill, MD
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is July (12.6 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in December
Chestnut Hill, MD
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (0.55").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Chestnut Hill, MD
- Average snowfall days in December: 2 days
The month with the highest number of snowfall days is February (3.8 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
Chestnut Hill, MD
- Average daylight in December: 9h and 30min
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 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Chestnut Hill, MD
- Average sunshine days in December: 21.9 days
The month with the most sunshine days is November (22.9 days).
The month with the least sunshine days is July (15.2 days).
Average UV index in December
Chestnut Hill, 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
Chestnut Hill, MD
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Chestnut Hill, 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).
