December weather forecast and climate
Summit, NY

The first month of the winter, December, is still a cold month in Summit, New York, with temperature in the range of an average low of 22.8°F (-5.1°C) and an average high of 32.9°F (0.5°C).

Temperature

In December, the average high-temperature decreases, from a chilly 43.2°F (6.2°C) in November, to a wintry 32.9°F (0.5°C). In Summit, in December, the average low-temperature is 22.8°F (-5.1°C).

Humidity

In Summit, the average relative humidity is 85%.

Rainfall

In Summit, during December, the rain falls for 11.4 days and regularly aggregates up to 2.64" (67mm) of precipitation. Throughout the year, there are 165.5 rainfall days, and 32.83" (834mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 15.5 days. Throughout December, 8.66" (220mm) of snow is accumulated. In Summit, during the entire year, snow falls for 81.8 days, and aggregates up to 42.09" (1069mm) of snow.

Daylight

December has the shortest days of the year in Summit, with an average of 9.1h of daylight.

Sunshine

In December, the average sunshine is 3.4h.

UV index

February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Summit. A UV Index value of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Summit?

In December, in Summit, New York, the average high-temperature is 32.9°F (0.5°C), and the average low-temperature is 22.8°F (-5.1°C).

What is the average humidity in December in Summit?

In Summit, New York, the average relative humidity in December is 85%.

How many days does it rain in December in Summit?

In Summit, New York, in December, it is raining for 11.4 days, with typically 2.64" (67mm) of accumulated precipitation.

How much does it snow in Summit in December?

In Summit, during December, snow falls for 15.5 days and regularly aggregates up to 8.66" (220mm) of snow.

What is the month with the shortest days in Summit?

December has the shortest days of the year in Summit, with an average of 9.1h of daylight.

How many hours of daylight does Summit have in December?

In December, the average length of the day is 9.1h.

How long on average sun shines in December in Summit?

In December, the average sunshine in Summit, New York, is 3.4h.

What is the month with the lowest UV index in Summit?

February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Summit, New York.

How high is the UV index in December in Summit?

The average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Summit, NY
  • Average high temperature in December: 0.5°C

The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-2.9°C).

  • Average low temperature in December: -5.1°C

The month with the highest average low temperature is July (13.9°C).
The coldest month (with the lowest average low temperature) is January (-9.3°C).

Average pressure in December - Summit, NY
  • Average pressure in December: 1018mbar

The month with the highest atmospheric pressure is November (1019.1mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

Average wind speed in December - Summit, NY
  • Average wind speed in December: 14km/h

The windiest month (with the highest average wind speed) is January (15.1km/h).
The calmest month (with the lowest average wind speed) is August (9.2km/h).

Average humidity in December - Summit, NY
  • Average humidity in December: 85%

The month with the highest relative humidity is February (86%).
Months with the lowest relative humidity are April and May (78%).

Average rainfall in December - Summit, NY
  • Average rainfall in December: 67mm

The wettest month (with the highest rainfall) is August (85mm).
The driest month (with the least rainfall) is September (54mm).

Average rainfall days in December - Summit, NY
  • Average rainfall days in December: 11.4 days

The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December - Summit, NY
  • Average snowfall in December: 220mm

The month with the highest snowfall is February (230mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in December - Summit, NY
  • Average snowfall days in December: 15.5 days

The month with the highest number of snowfall days is January (18.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Summit, NY
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 3.4h

The month with the most sunshine is July (Average sunshine: 10.1h).
The month with the least sunshine is February (Average sunshine: 3.1h).

Average sunshine days in December - Summit, NY
  • Average sunshine days in December: 9 days

The month with the most sunshine days is September (15 days).
The month with the least sunshine days is February (6.1 days).

Average UV index in December - Summit, NY
  • Average UV index in December: 1

Months with the highest UV index are May, June, July and August (UV index 5).
Months with the lowest UV index are February, November and December (UV index 1).

Average cloud cover in December - Summit, NY
  • Average cloud cover in December: 66

The month with the most cloud cover is February (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 37).

Average visibility in December - Summit, NY
  • Average visibility in December: 8km

Months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (8km).
The month with the lowest visibility is February (7km).