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 comes with a drop in the average high-temperature, falling from November's cool 52.5°F (11.4°C) to a frosty 43.5°F (6.4°C). In Harpers Ferry, an average low-temperature of 31.1°F (-0.5°C) is recorded during December nights.Humidity
In December, the average relative humidity in Harpers Ferry is 78%.Rainfall
In Harpers Ferry, during December, the rain falls for 10.9 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Harpers Ferry, during the entire year, the rain falls for 163.3 days and collects up to 29.84" (758mm) of precipitation.Snowfall
Months with snowfall in Harpers Ferry are January through April, November and December. In December, it is snowing for 3.6 days. Throughout December, 2.05" (52mm) of snow is accumulated. Throughout the year, in Harpers Ferry, there are 20.6 snowfall days, and 12.13" (308mm) of snow is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year in Harpers Ferry.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
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 reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 2 in December leads to these guidelines:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
Is December cold in Harpers Ferry?
What is the average humidity in December in Harpers Ferry?
How much does it rain in Harpers Ferry in December?
How much does it snow in Harpers Ferry in December?
What is the month with the shortest days in Harpers Ferry?
How many hours of daylight does Harpers Ferry have in December?
When is the sunrise / sunset in December in Harpers Ferry?
How long on average sun shines in December in Harpers Ferry?
What is the month with the lowest UV index in Harpers Ferry?
What is the UV index reading in December in Harpers Ferry?
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 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 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).
Harpers Ferry, West Virginia, USA
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