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 onset introduces a mild reduction in the average high-temperature, from a fresh 51.4°F (10.8°C) in November to a frosty 43.3°F (6.3°C). A mild drop to an average of 36°F (2.2°C) marks the nights during December.Humidity
In Smithtown, the average relative humidity in December is 74%.Rainfall
In December, the rain falls for 12 days. Throughout December, 3.78" (96mm) of precipitation is accumulated. In Smithtown, during the entire year, the rain falls for 155.9 days and collects up to 35.94" (913mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Smithtown, New York. In Smithtown, New York, in December, snow falls for 2.5 days, with typically accumulated 1.42" (36mm) of snow. Throughout the year, in Smithtown, there are 15.4 snowfall days, and 5.71" (145mm) of snow is accumulated.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 Smithtown, sunrise is at 6:58 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:35 pm EST.
Sunshine
The average sunshine in December is 4.9h.UV index
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Smithtown. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
Is December cold in Smithtown?
What is the average humidity in December in Smithtown?
How much does it rain in Smithtown in December?
How much does it snow in Smithtown in December?
What is the month with the shortest days in Smithtown?
What is the average length of the day in December in Smithtown?
When is the sunrise / sunset in December in Smithtown?
How long on average sun shines in December in Smithtown?
What is the month with the lowest UV index in Smithtown?
What is the UV index intensity in December in Smithtown?
Average temperature in December
Smithtown, NY
- Average high temperature in December: 43.3°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°F
The month with the highest average low temperature is August (71.6°F).
The coldest month (with the lowest average low temperature) is January (28.9°F).
Average pressure in December
Smithtown, 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 (29.93"Hg).
Average wind speed in December
Smithtown, NY
- Average wind speed in December: 12.4mph
The windiest month (with the highest average wind speed) is January (12.8mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity in December
Smithtown, 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
Smithtown, NY
- Average rainfall in December: 3.78"
The wettest month (with the highest rainfall) is July (3.94").
The driest month (with the least rainfall) is January (2.2").
Average rainfall days in December
Smithtown, NY
- Average rainfall days in December: 12 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in December
Smithtown, NY
- Average snowfall in December: 1.42"
The month with the highest snowfall is March (1.85").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Smithtown, NY
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is February (4.8 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
Smithtown, 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 48min).
Average sunshine days in December
Smithtown, NY
- Average sunshine days in December: 17 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in December
Smithtown, 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
Smithtown, 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 28).
Average visibility in December
Smithtown, 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).
Smithtown, New York, USA
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