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
Locust Valley's December weather features a light decline in high-temperatures, reducing from a fresh 51.1°F (10.6°C) in November to a cold 42.4°F (5.8°C). Consistently, Locust Valley reports average nighttime temperatures of 34.7°F (1.5°C) during December, a marginal step down from its daytime highs.Humidity
The months with the highest humidity in Locust Valley are February, May and December, with an average relative humidity of 75%.Rainfall
December is the month with the most rainfall in Locust Valley. Rain falls for 12.9 days and accumulates 4.06" (103mm) of precipitation.Snowfall
Months with snowfall in Locust Valley are January through April, November and December. In Locust Valley, in December, snow falls for 3.5 days, with typically accumulated 1.54" (39mm) of snow. Throughout the year, there are 22.2 snowfall days, and 7.24" (184mm) of snow is accumulated.Daylight
December has the shortest days of the year in Locust Valley, with an average of 9h and 18min of daylight.On the first day of December in Locust Valley, sunrise is at 7:00 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:36 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 of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in Locust Valley in December?
What are the most humid months in Locust Valley?
What is the average humidity in December in Locust Valley?
What is the wettest month in Locust Valley?
How many days does it rain in December in Locust Valley?
How much does it snow in Locust Valley in December?
What is the month with the shortest days in Locust Valley?
How many hours of daylight does Locust Valley have in December?
What time are sunrise and sunset in December in Locust Valley?
How many hours of sunshine does Locust Valley have in December?
What are the months with the lowest UV index in Locust Valley?
What is the UV index reading in December in Locust Valley?
Average temperature in December
Locust Valley, NY
- Average high temperature in December: 42.4°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in December: 34.7°F
The months with the highest average low temperature are July and August (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).
Average pressure in December
Locust Valley, 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
Locust Valley, NY
- Average wind speed in December: 10.8mph
The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).
Average humidity in December
Locust Valley, NY
- Average humidity in December: 75%
The months with the highest relative humidity are February, May and December (75%).
The months with the lowest relative humidity are August and November (71%).
Average rainfall in December
Locust Valley, NY
- Average rainfall in December: 4.06"
The wettest month (with the highest rainfall) is December (4.06").
The driest month (with the least rainfall) is September (2.4").
Average rainfall days in December
Locust Valley, NY
- Average rainfall days in December: 12.9 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (9.3 days).
Average snowfall in December
Locust Valley, NY
- Average snowfall in December: 1.54"
The month with the highest snowfall is March (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Locust Valley, NY
- Average snowfall days in December: 3.5 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Locust Valley, 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 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Locust Valley, NY
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in December
Locust Valley, 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
Locust Valley, NY
- Average cloud cover in December: 47
The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 29).
Average visibility in December
Locust Valley, 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).
Locust Valley, New York, USA
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