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 average high-temperature decreases in December, shifting from a fresh 51.1°F (10.6°C) in November to a wintry 41.9°F (5.5°C). December nights are marked by an average temperature drop to a subzero cold 30.9°F (-0.6°C).Humidity
In December, the average relative humidity is 81%.Rainfall
In Willow Grove, in December, it is raining for 11.1 days, with typically 2.13" (54mm) of accumulated precipitation. In Willow Grove, during the entire year, the rain falls for 153.8 days and collects up to 26.5" (673mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Willow Grove, in December, snow falls for 5.5 days, with typically accumulated 1.26" (32mm) of snow. Throughout the year, there are 26.1 snowfall days, and 7.13" (181mm) of snow is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:36 am and sunset at 5:15 pm. On the last day of the month, sunrise is at 7:54 am and sunset at 5:25 pm EST.
Sunshine
The average sunshine in December in Willow Grove is 4h.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 estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the UV index of 2 transforms into the following advice:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Willow Grove have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Willow Grove, KY
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).
Average pressure in December
Willow Grove, KY
- Average pressure in December: 30.13"Hg
The months with the highest atmospheric pressure are January and November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Willow Grove, KY
- Average wind speed in December: 8.3mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in December
Willow Grove, KY
- Average humidity in December: 81%
The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are September and October (75%).
Average rainfall in December
Willow Grove, KY
- Average rainfall in December: 2.13"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is September (1.5").
Average rainfall days in December
Willow Grove, KY
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is May (18.1 days).
The months with the least rainy days are February and November (9.1 days).
Average snowfall in December
Willow Grove, KY
- Average snowfall in December: 1.26"
The month with the highest snowfall is March (1.97").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Willow Grove, KY
- Average snowfall days in December: 5.5 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Willow Grove, KY
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Willow Grove, KY
- Average sunshine days in December: 15.1 days
The months with the most sunshine days are October and November (19 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Willow Grove, KY
- 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
Willow Grove, KY
- Average cloud cover in December: 58
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Willow Grove, KY
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are May and July (5mi).
Willow Grove, Kentucky, USA
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