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
Welcoming December, Chatham observes a shift in the average high-temperature, falling from November's frosty 45.5°F (7.5°C) to a wintry 34.9°F (1.6°C). Chatham's average low-temperature in the month of December is recorded at a freezing cold 24.1°F (-4.4°C).Humidity
February and December, with an average relative humidity of 83%, are the most humid months in Chatham.Rainfall
In Chatham, during December, the rain falls for 7.8 days and regularly aggregates up to 1.46" (37mm) of precipitation. In Chatham, during the entire year, the rain falls for 135.1 days and collects up to 20.39" (518mm) of precipitation.Snowfall
Months with snowfall in Chatham are January through May, October through December. In December, in Chatham, it is snowing for 5.6 days. Throughout December, 2.6" (66mm) of snow is accumulated. In Chatham, during the entire year, snow falls for 36.9 days and aggregates up to 15.98" (406mm) 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 the month, sunrise is at 7:04 am and sunset at 4:22 pm. On the last day of December, in Chatham, sunrise is at 7:23 am and sunset at 4:31 pm EST.
Sunshine
In Chatham, New York, the average sunshine in December is 4.4h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Chatham. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the UV index of 2 transforms into the following advice:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Chatham?
What are the most humid months in Chatham?
What is the average humidity in December in Chatham?
How many days does it rain in December in Chatham?
How much does it snow in Chatham in December?
What is the month with the shortest days in Chatham?
How many hours of daylight does Chatham have in December?
When is the sunrise / sunset in December in Chatham?
How long on average sun shines in December in Chatham?
When is the lowest UV index in Chatham?
How high is the UV index in December in Chatham?
Average temperature in December
Chatham, NY
- Average high temperature in December: 34.9°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 (29.1°F).
- Average low temperature in December: 24.1°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in December
Chatham, 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
Chatham, NY
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January and March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in December
Chatham, NY
- Average humidity in December: 83%
The months with the highest relative humidity are February and December (83%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Chatham, NY
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is July (2.4").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in December
Chatham, NY
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in December
Chatham, NY
- Average snowfall in December: 2.6"
The month with the highest snowfall is March (3.9").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Chatham, NY
- Average snowfall days in December: 5.6 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
Chatham, NY
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 4h and 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Chatham, NY
- Average sunshine days in December: 19 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is June (12.5 days).
Average UV index in December
Chatham, NY
- Average UV index in December: 2
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, February, March, November and December (UV index 2).
Average cloud cover in December
Chatham, NY
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 58).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in December
Chatham, NY
- Average visibility in December: 6mi
The months with the highest visibility are January, April, November and December (6mi).
The months with the lowest visibility are February, March, May, June, July, August, September and October (5mi).
Chatham, New York, USA
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