December weather forecastRockcastle, KY
December
Weather in December
December, the first month of the winter in Rockcastle, is also a frosty month, with temperature in the range of an average low of 34.7°F (1.5°C) and an average high of 46.9°F (8.3°C).Temperature
The transition into December involves a small decrease in the average high-temperature, dipping slightly from a mild 55.4°F (13°C) in November to a chilly 46.9°F (8.3°C). During December, the average low-temperature is recorded at a cold 34.7°F (1.5°C).Humidity
The average relative humidity in December is 78%.Rainfall
In Rockcastle, in December, during 12.7 rainfall days, 3.39" (86mm) of precipitation is typically accumulated. In Rockcastle, during the entire year, the rain falls for 160.8 days and collects up to 35.79" (909mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In December, it is snowing for 2.5 days. Throughout December, 1.14" (29mm) of snow is accumulated. In Rockcastle, during the entire year, snow falls for 15.6 days and aggregates up to 6.54" (166mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 6:46 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:04 am and sunset at 4:45 pm CST.
Sunshine
In December, the average sunshine is 4.8h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rockcastle, KY
- Average high temperature in December: 46.9°F
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (42.1°F).
- Average low temperature in December: 34.7°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 (28.8°F).
Average pressure in December
Rockcastle, KY
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Rockcastle, KY
- Average wind speed in December: 8.4mph
The windiest months (with the highest average wind speed) are February and April (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in December
Rockcastle, KY
- Average humidity in December: 78%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in December
Rockcastle, KY
- Average rainfall in December: 3.39"
The wettest month (with the highest rainfall) is February (4.45").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in December
Rockcastle, KY
- Average rainfall days in December: 12.7 days
The month with the highest number of rainy days is March (16.4 days).
The month with the least rainy days is November (9.9 days).
Average snowfall in December
Rockcastle, KY
- Average snowfall in December: 1.14"
The month with the highest snowfall is February (2.05").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Rockcastle, KY
- Average snowfall days in December: 2.5 days
The months with the highest number of snowfall days are January and February (4.8 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
Rockcastle, KY
- Average daylight in December: 9h and 42min
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 42min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in December
Rockcastle, KY
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is February (11.6 days).
Average UV index in December
Rockcastle, 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 and December (UV index 2).
Average cloud cover in December
Rockcastle, KY
- Average cloud cover in December: 48
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in December
Rockcastle, KY
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
