December weather forecastHarpers Ferry, WV
December
Weather in December
December, the first month of the winter in Harpers Ferry, is also a frosty month, with an average temperature fluctuating between 31.1°F (-0.5°C) and 43.5°F (6.4°C).Temperature
Harpers Ferry's December weather features a mild decline in high-temperatures, reducing from a fresh 52.5°F (11.4°C) in November to a frosty 43.5°F (6.4°C). In Harpers Ferry, the average temperature during the nights of December drops to a subzero cold 31.1°F (-0.5°C).Humidity
In Harpers Ferry, the average relative humidity in December is 78%.Rainfall
In December, the rain falls for 10.9 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. Throughout the year, there are 163.3 rainfall days, and 29.84" (758mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Harpers Ferry, during December, snow falls for 3.6 days and regularly aggregates up to 2.05" (52mm) of snow. Throughout the year, there are 20.6 snowfall days, and 12.13" (308mm) of snow is accumulated.Daylight
The month with the shortest days in Harpers Ferry is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:12 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:57 pm EST.
Sunshine
In Harpers Ferry, the average sunshine in December is 5.1h.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 unprotected exposure to Sun's UV rays for the average person.Note: An average maximum UV index of 2 in December leads to these recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Mind you! Snow reflection can increase the intensity of 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
Harpers Ferry, WV
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is January (38.1°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Harpers Ferry, WV
- 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
Harpers Ferry, WV
- Average wind speed in December: 6.7mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in December
Harpers Ferry, WV
- Average humidity in December: 78%
The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Harpers Ferry, WV
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is May (3.35").
The driest month (with the least rainfall) is January (1.97").
Average rainfall days in December
Harpers Ferry, WV
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in December
Harpers Ferry, WV
- Average snowfall in December: 2.05"
The month with the highest snowfall is January (3.62").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Harpers Ferry, WV
- Average snowfall days in December: 3.6 days
The month with the highest number of snowfall days is January (6.9 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
Harpers Ferry, WV
- 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 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 0min).
Average sunshine days in December
Harpers Ferry, WV
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Harpers Ferry, WV
- 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
Harpers Ferry, WV
- Average cloud cover in December: 46
The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Harpers Ferry, WV
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, June, July, August and November (6mi).
The months with the lowest visibility are January, May, September, October and December (5mi).
