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
December's arrival aligns with a minor decrease in average high-temperatures, from November's cool 51.6°F (10.9°C) to a chilly 43.7°F (6.5°C). The nighttime temperature in Uniondale in December experiences a minor dip, averaging an icy 36.1°F (2.3°C).Humidity
The average relative humidity in December is 74%.Rainfall
In Uniondale, in December, during 9.7 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 112.1 rainfall days, and 8.66" (220mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, October through December. In Uniondale, in December, snow falls for 2.5 days, with typically accumulated 0.35" (9mm) of snow. In Uniondale, during the entire year, snow falls for 14.1 days and aggregates up to 1.34" (34mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of December in Uniondale, New York, sunrise is at 6:59 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:37 pm EST.
Sunshine
The average sunshine in December is 5h.UV index
The months with the lowest UV index are January through March and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 2 during December translates into the following directions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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 Uniondale?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December in Uniondale?
What time 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 intensity in December?
Average temperature in December
Uniondale, NY
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in December: 36.1°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (29.3°F).
Average pressure in December
Uniondale, 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
Uniondale, NY
- Average wind speed in December: 12.5mph
The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity in December
Uniondale, NY
- Average humidity in December: 74%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is November (71%).
Average rainfall in December
Uniondale, NY
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is July (0.98").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in December
Uniondale, NY
- Average rainfall days in December: 9.7 days
The month with the highest number of rainy days is July (12.4 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in December
Uniondale, NY
- Average snowfall in December: 0.35"
The month with the highest snowfall is January (0.43").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in December
Uniondale, NY
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is January (4.2 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
Uniondale, NY
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Uniondale, NY
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (15.1 days).
Average UV index in December
Uniondale, 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
Uniondale, NY
- Average cloud cover in December: 48
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Uniondale, 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).
Uniondale, New York, USA
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