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 onset of December brings a small change in high-temperatures, falling from a frosty 44.8°F (7.1°C) in November to a wintry 33.8°F (1°C). In December, Greenwich experiences an average nighttime temperature of 24.1°F (-4.4°C).Humidity
In Greenwich, the average relative humidity in December is 81%.Rainfall
In December, the rain falls for 6.8 days. Throughout December, 1.3" (33mm) of precipitation is accumulated. Throughout the year, there are 123.3 rainfall days, and 18.62" (473mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Greenwich, New York, in December, snow falls for 6.3 days, with typically accumulated 2.68" (68mm) of snow. In Greenwich, New York, during the entire year, snow falls for 37.3 days and aggregates up to 16.57" (421mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:29 pm EST.
Sunshine
In Greenwich, the average sunshine in December is 4.3h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Greenwich. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December in Greenwich?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Greenwich have in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Greenwich, NY
- Average high temperature in December: 33.8°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in December: 24.1°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 (16.3°F).
Average pressure in December
Greenwich, NY
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Greenwich, NY
- Average wind speed in December: 7mph
The windiest months (with the highest average wind speed) are January and April (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Greenwich, NY
- Average humidity in December: 81%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Greenwich, NY
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is July (2.01").
The driest month (with the least rainfall) is March (1.1").
Average rainfall days in December
Greenwich, NY
- Average rainfall days in December: 6.8 days
The month with the highest number of rainy days is June (14.1 days).
The month with the least rainy days is January (4 days).
Average snowfall in December
Greenwich, NY
- Average snowfall in December: 2.68"
The month with the highest snowfall is February (5").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Greenwich, NY
- Average snowfall days in December: 6.3 days
The month with the highest number of snowfall days is February (9.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Greenwich, NY
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Greenwich, NY
- Average sunshine days in December: 19.2 days
The month with the most sunshine days is January (20.4 days).
The month with the least sunshine days is June (14.3 days).
Average UV index in December
Greenwich, NY
- Average UV index in December: 1
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 and December (UV index 1).
Average cloud cover in December
Greenwich, NY
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in December
Greenwich, NY
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, May, October, November and December (6mi).
The months with the lowest visibility are February, June, July, August and September (5mi).
Greenwich, New York, USA
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