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 sea temperature 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
December's onset in New Castle brings a reduction in the average high-temperature, from a fresh 53.2°F (11.8°C) in November to a frosty 44.1°F (6.7°C). New Castle's average low-temperature in December is measured at a cold 32.9°F (0.5°C).Humidity
In December, the average relative humidity in New Castle, Delaware, is 77%.Rainfall
In New Castle, in December, during 8.8 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. In New Castle, during the entire year, the rain falls for 143.2 days and collects up to 21.89" (556mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In New Castle, in December, snow falls for 2.4 days, with typically accumulated 0.51" (13mm) of snow. Throughout the year, there are 15 snowfall days, and 5.47" (139mm) of snow is accumulated.Ocean temperature
In New Castle, the average seawater temperature in December is 48.6°F (9.2°C).Note: Swimming at temperatures less than 50°F (10°C) in 48.6°F (9.2°C) is feasible with the right swimsuit; if not, expect cold shock and breathlessness. A quick swim at 55.4°F (13°C) without adequate warmth can be discomforting.
Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December in New Castle, sunrise is at 7:04 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:48 pm EST.
Sunshine
The average sunshine in December is 5.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in New Castle. 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 daily maximum UV index of 2 in December interprets into the following advice:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. It's recommended to limit sun exposure when its radiation is at its peak during midday. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Frequently asked questions
Is December cold in New Castle?
What is the average humidity in December in New Castle?
How much does it rain in New Castle in December?
How many days does it snow in December in New Castle?
How cold is the water in December in New Castle?
What is the month with the shortest days in New Castle?
How many hours of daylight does New Castle have in December?
When is the sunrise / sunset in December in New Castle?
How long on average sun shines in December in New Castle?
What is the month with the lowest UV index in New Castle?
What is the UV index reading in December in New Castle?
Average temperature in December
New Castle, DE
- Average high temperature in December: 44.1°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 (37.8°F).
- Average low temperature in December: 32.9°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 (26.1°F).
Average pressure in December
New Castle, DE
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
New Castle, DE
- Average wind speed in December: 8.1mph
The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in December
New Castle, DE
- Average humidity in December: 77%
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
New Castle, DE
- Average rainfall in December: 1.85"
The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is January (1.38").
Average rainfall days in December
New Castle, DE
- Average rainfall days in December: 8.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
New Castle, DE
- Average snowfall in December: 0.51"
The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
New Castle, DE
- Average snowfall days in December: 2.4 days
The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
New Castle, DE
- Average sea temperature in December: 48.5°F
The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).
Average daylight in December /
Average sunshine in December
New Castle, DE
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
New Castle, DE
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in December
New Castle, DE
- 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
New Castle, DE
- Average cloud cover in December: 45
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
New Castle, DE
- 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).
New Castle, Delaware, USA
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