December weather forecastThiells, NY
December
Weather in December
The first month of the winter, December, is also a wintry month in Thiells, New York, with an average temperature varying between 40.3°F (4.6°C) and 29.3°F (-1.5°C).Temperature
With the onset of December, Thiells experiences a modest temperature adjustment, with the average high-temperature receding from a cool 50°F (10°C) in November to a wintry 40.3°F (4.6°C). The nights of December anticipate an average low-temperature of 29.3°F (-1.5°C).Humidity
In December, the average relative humidity is 78%.Rainfall
In Thiells, in December, during 10.1 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. Throughout the year, there are 152.8 rainfall days, and 30.79" (782mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Thiells, during December, snow falls for 4.4 days and regularly aggregates up to 2.2" (56mm) of snow. In Thiells, during the entire year, snow falls for 22.6 days and aggregates up to 12.28" (312mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:02 am and sunset at 4:27 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:37 pm EST.
Sunshine
The average sunshine in December is 4.9h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Thiells, NY
- Average high temperature in December: 40.3°F
The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (34.7°F).
- Average low temperature in December: 29.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Thiells, 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
Thiells, NY
- Average wind speed in December: 6.9mph
The windiest months (with the highest average wind speed) are January and March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Thiells, NY
- Average humidity in December: 78%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
Thiells, NY
- Average rainfall in December: 3.19"
The wettest month (with the highest rainfall) is July (3.23").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in December
Thiells, NY
- Average rainfall days in December: 10.1 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Thiells, NY
- Average snowfall in December: 2.2"
The month with the highest snowfall is March (3.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Thiells, NY
- Average snowfall days in December: 4.4 days
The month with the highest number of snowfall days is February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Thiells, NY
- Average daylight in December: 9h and 18min
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 18min).
- Average sunshine in December: 4h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Thiells, NY
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (11.5 days).
Average UV index in December
Thiells, NY
- Average UV index in December: 2
The months with the highest UV index are 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
Thiells, NY
- Average cloud cover in December: 48
The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Thiells, NY
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are February and May (5mi).
