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 start of December signals a decrease in the average high-temperature, transitioning from a chilly 45.3°F (7.4°C) in November to a cold 35.6°F (2°C). Rock Hill's nighttime temperature in December falls to an average of 23.9°F (-4.5°C).Humidity
The months with the highest humidity in Rock Hill are February and December, with an average relative humidity of 85%.Rainfall
In Rock Hill, during December, the rain falls for 9.8 days and regularly aggregates up to 2.32" (59mm) of precipitation. Throughout the year, in Rock Hill, New York, there are 153.7 rainfall days, and 26.73" (679mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rock Hill are January through May, October through December. December is the month with the most snowfall. Snow falls for 8.1 days and accumulates 5.04" (128mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Rock Hill, New York.On the first day of the month, sunrise is at 7:06 am and sunset at 4:28 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:38 pm EST.
Sunshine
The average sunshine in December in Rock Hill is 4.3h.UV index
The months with the lowest UV index in Rock Hill are January through March, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Frequently asked questions
How cold is December in Rock Hill?
What is the most humid month in Rock Hill?
What is the average humidity in December in Rock Hill?
How many days does it rain in December in Rock Hill?
What is the snowiest month in Rock Hill?
How much does it snow in Rock Hill in December?
What is the month with the shortest days in Rock Hill?
What is the average length of the day in December in Rock Hill?
When are sunrise and sunset in December in Rock Hill?
How long on average sun shines in December in Rock Hill?
When is the lowest UV index in Rock Hill?
What is the UV index intensity in December in Rock Hill?
Average temperature in December
Rock Hill, NY
- Average high temperature in December: 35.6°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in December
Rock Hill, NY
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Rock Hill, NY
- Average wind speed in December: 7.1mph
The windiest months (with the highest average wind speed) are January and February (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Rock Hill, NY
- Average humidity in December: 85%
The months with the highest relative humidity are February and December (85%).
The month with the lowest relative humidity is July (77%).
Average rainfall in December
Rock Hill, NY
- Average rainfall in December: 2.32"
The wettest month (with the highest rainfall) is May (2.8").
The driest months (with the least rainfall) are January and February (1.65").
Average rainfall days in December
Rock Hill, NY
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Rock Hill, NY
- Average snowfall in December: 5.04"
The month with the highest snowfall is December (5.04").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Rock Hill, NY
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is February (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rock Hill, NY
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in December
Rock Hill, NY
- Average sunshine days in December: 16.2 days
The month with the most sunshine days is January (18.3 days).
The month with the least sunshine days is May (10.8 days).
Average UV index in December
Rock Hill, NY
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Rock Hill, NY
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is July (Cloud cover 38).
Average visibility in December
Rock Hill, NY
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (5mi).
The months with the lowest visibility are May and September (4mi).
Rock Hill, New York, USA
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