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
Rocky Hill's weather in December involves a decrease in the average high-temperature, moving down from November's fresh 51.4°F (10.8°C) to a wintry 42.3°F (5.7°C). In Rocky Hill, the expected average low-temperature for December is a subzero cold 31.1°F (-0.5°C).Humidity
In December, the average relative humidity is 78%.Rainfall
In Rocky Hill, Pennsylvania, during December, the rain falls for 7.7 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, in Rocky Hill, Pennsylvania, there are 124.6 rainfall days, and 14.25" (362mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. In December, it is snowing for 2.2 days. Throughout December, 0.79" (20mm) of snow is accumulated. In Rocky Hill, during the entire year, snow falls for 18.5 days and aggregates up to 5.51" (140mm) of snow.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year in Rocky Hill.On the first day of the month, sunrise is at 7:05 am and sunset at 4:37 pm. On the last day of December, in Rocky Hill, sunrise is at 7:23 am and sunset at 4:47 pm EST.
Sunshine
In Rocky Hill, Pennsylvania, the average sunshine in December is 4.8h.UV index
The months with the lowest UV index in Rocky Hill are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Frequently asked questions
Is December cold in Rocky Hill?
What is the average humidity in December in Rocky Hill?
How many days does it rain in December in Rocky Hill?
How much does it snow in Rocky Hill in December?
What is the month with the shortest days in Rocky Hill?
How many hours of daylight does Rocky Hill have in December?
When is the sunrise / sunset in December in Rocky Hill?
How long on average sun shines in December in Rocky Hill?
What are the months with the lowest UV index in Rocky Hill?
What is the UV index reading in December in Rocky Hill?
Average temperature in December
Rocky Hill, PA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 31.1°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Rocky Hill, PA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Rocky Hill, PA
- Average wind speed in December: 7.9mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Rocky Hill, PA
- Average humidity in December: 78%
The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (73%).
Average rainfall in December
Rocky Hill, PA
- Average rainfall in December: 1.14"
The wettest month (with the highest rainfall) is August (1.89").
The driest month (with the least rainfall) is January (0.79").
Average rainfall days in December
Rocky Hill, PA
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is January (5 days).
Average snowfall in December
Rocky Hill, PA
- Average snowfall in December: 0.79"
The month with the highest snowfall is March (1.57").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Rocky Hill, PA
- Average snowfall days in December: 2.2 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Rocky Hill, PA
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in December
Rocky Hill, PA
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is June (13.3 days).
Average UV index in December
Rocky Hill, PA
- 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, March, November and December (UV index 2).
Average cloud cover in December
Rocky Hill, PA
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Rocky Hill, PA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
Rocky Hill, Pennsylvania, USA
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