December weather forecastHartley, KY
December
Weather in December
December, the first month of the winter in Hartley, is also a frosty month, with an average temperature fluctuating between 32.4°F (0.2°C) and 45.1°F (7.3°C).Temperature
December's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a fresh 53.4°F (11.9°C) in November to a chilly 45.1°F (7.3°C). An average nighttime temperature of 32.4°F (0.2°C) is noted during the month of December.Humidity
In December, the average relative humidity is 80%.Rainfall
In Hartley, in December, during 13.6 rainfall days, 3.66" (93mm) of precipitation is typically accumulated. In Hartley, Kentucky, during the entire year, the rain falls for 201.6 days and collects up to 40.75" (1035mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Hartley, in December, snow falls for 10 days, with typically accumulated 5.43" (138mm) of snow. In Hartley, during the entire year, snow falls for 46.1 days and aggregates up to 24.8" (630mm) of snow.Daylight
December has the shortest days of the year in Hartley, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:26 am and sunset at 5:13 pm. On the last day of December, sunrise is at 7:44 am and sunset at 5:23 pm EST.
Sunshine
In December, the average sunshine in Hartley is 4.7h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Hartley, Kentucky. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Hartley, KY
- Average high temperature in December: 45.1°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (39.9°F).
- Average low temperature in December: 32.4°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in December
Hartley, KY
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in December
Hartley, KY
- Average wind speed in December: 5.9mph
The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in December
Hartley, KY
- Average humidity in December: 80%
The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and November (76%).
Average rainfall in December
Hartley, KY
- Average rainfall in December: 3.66"
The wettest month (with the highest rainfall) is May (4.21").
The driest month (with the least rainfall) is September (2.48").
Average rainfall days in December
Hartley, KY
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is May (22.2 days).
The month with the least rainy days is February (12.3 days).
Average snowfall in December
Hartley, KY
- Average snowfall in December: 5.43"
The month with the highest snowfall is February (6.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Hartley, KY
- Average snowfall days in December: 10 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Hartley, KY
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 4h and 42min
The months with the most sunshine are June and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Hartley, KY
- Average sunshine days in December: 11.1 days
The month with the most sunshine days is November (15.4 days).
The month with the least sunshine days is May (6.8 days).
Average UV index in December
Hartley, 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
Hartley, KY
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Hartley, KY
- Average visibility in December: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
