December weather forecast and climate
Cortland, NY

A monument from the civil war stands high in the neat lawns near the iconic courthouse in the Courthouse Park in Cortland, New York
A monument from the civil war stands high in the neat lawns near the iconic courthouse in the Courthouse Park in Cortland, New York

Weather in December

December, the first month of the winter, in Cortland, is also a wintry month, with average temperature ranging between min 23.7°F (-4.6°C) and max 33.1°F (0.6°C).

Temperature

In Cortland, New York, the average high-temperature decreases, from a chilly 43.3°F (6.3°C) in November, to a cold 33.1°F (0.6°C). In Cortland, New York, the average low-temperature is 23.7°F (-4.6°C).

Humidity

In December, the average relative humidity in Cortland is 87%.

Rainfall

In Cortland, during 8.1 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Cortland, during the entire year, the rain falls for 149.8 days and collects up to 22.36" (568mm) of precipitation.

Snowfall

Months with snowfall in Cortland are January through May, October through December. In December, in Cortland, it is snowing for 15 days. Throughout December, 4.8" (122mm) of snow is accumulated. In Cortland, during the entire year, snow falls for 79.7 days, and aggregates up to 24.06" (611mm) of snow.

Daylight

The month with the shortest days in Cortland is December, with an average of 9.1h of daylight.

Sunshine

In December, the average sunshine is 2.9h.

UV index

Months with the lowest UV index are January, February and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected 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:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Cortland?

The average high-temperature, in December, in Cortland, New York, is 33.1°F (0.6°C), while the average low-temperature is 23.7°F (-4.6°C).

What is the average humidity in December in Cortland?

The average relative humidity in December in Cortland, New York, is 87%.

How much does it rain in Cortland in December?

In Cortland, in December, it is raining for 8.1 days, with typically 1.5" (38mm) of accumulated precipitation.

How many days does it snow in December in Cortland?

In December, in Cortland, New York, it is snowing for 15 days. Throughout December, 4.8" (122mm) of snow is accumulated.

What is the month with the shortest days in Cortland?

The month with the shortest days in Cortland is December, with an average of 9.1h of daylight.

What is the average length of the day in December in Cortland?

In December, the average length of the day in Cortland, New York, is 9.1h.

How many hours of sunshine does Cortland have in December?

The average sunshine in December is 2.9h.

What are the months with the lowest UV index in Cortland?

Months with the lowest UV index in Cortland, New York, are January, February and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Cortland?

In Cortland, New York, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to the UV radiation.

Average temperature in December
Cortland, NY

Average temperature in December - Cortland, NY
  • Average high temperature in December: 33.1°F

The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in December: 23.7°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).

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Average pressure in December
Cortland, NY

Average pressure in December - Cortland, NY
  • Average pressure in December: 30.07"

The month with the highest atmospheric pressure is November (30.1").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Cortland, NY

Average wind speed in December - Cortland, NY
  • Average wind speed in December: 9.4mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average humidity in December
Cortland, NY

Average humidity in December - Cortland, NY
  • Average humidity in December: 87%

Months with the highest relative humidity are January and February (88%).
Months with the lowest relative humidity are April and May (80%).

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Average rainfall in December
Cortland, NY

Average rainfall in December - Cortland, NY
  • Average rainfall in December: 1.5"

The wettest months (with the highest rainfall) are May and July (2.48").
The driest month (with the least rainfall) is November (1.34").

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Average rainfall days in December
Cortland, NY

Average rainfall days in December - Cortland, NY
  • Average rainfall days in December: 8.1 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.7 days).

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Average snowfall in December
Cortland, NY

Average snowfall in December - Cortland, NY
  • Average snowfall in December: 4.8"

The month with the highest snowfall is February (5.75").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Cortland, NY

Average snowfall days in December - Cortland, NY
  • Average snowfall days in December: 15 days

The month with the highest number of snowfall days is January (18.2 days).
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
Cortland, NY

Average daylight in December / Average sunshine in December - Cortland, 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: 2.9h

The month with the most sunshine is July (Average sunshine: 10.1h).
The month with the least sunshine is February (Average sunshine: 2.4h).

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Average sunshine days in December
Cortland, NY

Average sunshine days in December - Cortland, NY
  • Average sunshine days in December: 9.9 days

The month with the most sunshine days is September (15.8 days).
The month with the least sunshine days is February (7.7 days).

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Average UV index in December
Cortland, NY

Average UV index in December - Cortland, 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 January, February and December (UV index 1).

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Average cloud cover in December
Cortland, NY

Average cloud cover in December - Cortland, NY
  • Average cloud cover in December: 71

Months with the most cloud cover are January and February (Cloud cover 74).
Months with the least cloud cover are July and August (Cloud cover 36).

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Average visibility in December
Cortland, NY

Average visibility in December - Cortland, NY
  • Average visibility in December: 5mi

The month with the highest visibility is April (6mi).
The month with the lowest visibility is February (4mi).

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