December weather forecast
Chatham, NY

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Weather in December

The first month of the winter, December, is also a wintry month in Chatham, New York, with temperature in the range of an average low of 24.1°F (-4.4°C) and an average high of 34.9°F (1.6°C).

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.
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Frequently asked questions

How cold is December in Chatham?

In December, the average high-temperature and low-temperature in Chatham, New York, are 34.9°F (1.6°C) and 24.1°F (-4.4°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, in July is computed to be 86°F (30°C).

What are the most humid months in Chatham?

The months with the highest humidity in Chatham are February and December, with an average relative humidity of 83%.

What is the average humidity in December in Chatham?

The average relative humidity in December in Chatham, New York, is 83%.

How many days does it rain in December in Chatham?

In December, the rain falls for 7.8 days. Throughout December, 1.46" (37mm) of precipitation is accumulated.

How much does it snow in Chatham in December?

In Chatham, during December, snow falls for 5.6 days and regularly aggregates up to 2.6" (66mm) of snow.

What is the month with the shortest days in Chatham?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Chatham.

How many hours of daylight does Chatham have in December?

The average day length in December in Chatham is 9h and 8min.

When is the sunrise / sunset in December in Chatham?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:31 pm EST.

How long on average sun shines in December in Chatham?

The average sunshine duration in December in Chatham is 4.4h.

When is the lowest UV index in Chatham?

The months with the lowest UV index in Chatham are January through March, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Chatham?

In Chatham, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Chatham, NY

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).

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Average pressure in December
Chatham, NY

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).

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Average wind speed in December
Chatham, NY

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).

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Average humidity in December
Chatham, NY

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%).

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Average rainfall in December
Chatham, NY

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").

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Average rainfall days in December
Chatham, NY

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).

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Average snowfall in December
Chatham, NY

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").

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Average snowfall days in December
Chatham, NY

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).

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Average daylight in December /
Average sunshine in December
Chatham, NY

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).

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Average sunshine days in December
Chatham, NY

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).

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Average UV index in December
Chatham, NY

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).

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Average cloud cover in December
Chatham, NY

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).

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Average visibility in December
Chatham, NY

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).

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Chatham, New York, USA

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