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
A subtle change in temperatures is noted as November gives way to December, with average highs reducing from a fresh 51.4°F (10.8°C) to a frosty 43.3°F (6.3°C). Recording a slight decline in temperature during the nights, Syosset's December temperatures average at a cold 35.8°F (2.1°C).Humidity
The average relative humidity in December in Syosset is 74%.Rainfall
In December, the rain falls for 8.5 days. Throughout December, 0.83" (21mm) of precipitation is accumulated. Throughout the year, in Syosset, New York, there are 103.6 rainfall days, and 7.83" (199mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows. Throughout December, in the average 2.8 snowfall days, it receives 0.39" (10mm) of snow. In Syosset, New York, during the entire year, snow falls for 14.8 days and aggregates up to 1.34" (34mm) of snow.Daylight
The month with the shortest days in Syosset is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 6:59 am and sunset at 4:26 pm. On the last day of December, in Syosset, New York, sunrise is at 7:18 am and sunset at 4:36 pm EST.
Sunshine
In December, the average sunshine is 4.9h.UV index
The months with the lowest UV index in Syosset, New York, are January through March 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 exposure to the Sun's UV radiation for the ordinary person.Note: In December, the UV index of 2 transforms into the following advice:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in Syosset?
What is the average humidity in December in Syosset?
How much does it rain in Syosset in December?
When does it start to snow in Syosset?
What is the month with the shortest days in Syosset?
What is the average length of the day in December in Syosset?
When is the sunrise / sunset in December in Syosset?
How many hours of sunshine does Syosset have in December?
When is the lowest UV index in Syosset?
How high is the UV index in December in Syosset?
Average temperature in December
Syosset, NY
- Average high temperature in December: 43.3°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (37.4°F).
- Average low temperature in December: 35.8°F
The months with the highest average low temperature are July and August (71.2°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in December
Syosset, NY
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Syosset, NY
- Average wind speed in December: 12.1mph
The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (8.1mph).
Average humidity in December
Syosset, NY
- Average humidity in December: 74%
The months with the highest relative humidity are May and June (76%).
The month with the lowest relative humidity is November (71%).
Average rainfall in December
Syosset, NY
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is July (0.87").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in December
Syosset, NY
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is July (11.3 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in December
Syosset, NY
- Average snowfall in December: 0.39"
The month with the highest snowfall is March (0.43").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Syosset, NY
- Average snowfall days in December: 2.8 days
The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Syosset, NY
- Average daylight in December: 9h and 2min
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 5min
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 42min).
Average sunshine days in December
Syosset, NY
- Average sunshine days in December: 19.5 days
The month with the most sunshine days is January (22.4 days).
The month with the least sunshine days is July (16.9 days).
Average UV index in December
Syosset, 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 and December (UV index 2).
Average cloud cover in December
Syosset, NY
- Average cloud cover in December: 48
The month with the most cloud cover is December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in December
Syosset, NY
- 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).
Syosset, New York, USA
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