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
During the shift to December, Castalia records a mild decrease in average high-temperature, moving from a refreshing 59.4°F (15.2°C) in November to a fresh 52.5°F (11.4°C). Throughout the month of December, Castalia observes an average nighttime temperature of 38.5°F (3.6°C).Humidity
In Castalia, the average relative humidity in December is 77%.Rainfall
In Castalia, in December, it is raining for 10.5 days, with typically 2.52" (64mm) of accumulated precipitation. Throughout the year, there are 160.1 rainfall days, and 33.11" (841mm) of precipitation is accumulated.Snowfall
January through March and December are months with snowfall in Castalia. December is the first month it typically snows. Throughout December, in the average 0.6 snowfall days, it receives 0.51" (13mm) of snow. In Castalia, during the entire year, snow falls for 5 days and aggregates up to 3.46" (88mm) of snow.Daylight
The month with the shortest days in Castalia is December, with an average of 9h and 48min of daylight.On the first day of December, sunrise is at 7:05 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:08 pm EST.
Sunshine
The month with the least sunshine is December, with an average of 5.4h of sunshine.UV index
In Castalia, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A maximum daily UV index of 3 during December morphs into the following directions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in December?
What is the average humidity in December?
How much does it rain in Castalia in December?
When does it start to snow?
What is the month with the shortest days?
How many hours of daylight does Castalia have in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Castalia have in December?
What is the UV index reading in December?
Average temperature in December
Castalia, NC
- Average high temperature in December: 52.5°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (47.7°F).
- Average low temperature in December: 38.5°F
The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).
Average pressure in December
Castalia, NC
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Castalia, NC
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in December
Castalia, NC
- Average humidity in December: 77%
The month with the highest relative humidity is September (78%).
The months with the lowest relative humidity are January, March, April and November (74%).
Average rainfall in December
Castalia, NC
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is October (2.13").
Average rainfall days in December
Castalia, NC
- Average rainfall days in December: 10.5 days
The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in December
Castalia, NC
- Average snowfall in December: 0.51"
The month with the highest snowfall is January (1.54").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Castalia, NC
- Average snowfall days in December: 0.6 days
The month with the highest number of snowfall days is February (2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Castalia, NC
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Castalia, NC
- Average sunshine days in December: 18.8 days
The month with the most sunshine days is October (20 days).
The month with the least sunshine days is July (9.8 days).
Average UV index in December
Castalia, NC
- Average UV index in December: 3
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in December
Castalia, NC
- Average cloud cover in December: 42
The months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in December
Castalia, NC
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Castalia, North Carolina, USA
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