December weather forecast
Cortland, NY

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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 in Cortland welcomes the winter season in full swing. With the temperatures oscillating between 23.7°F (-4.6°C) and 33.1°F (0.6°C), the city becomes a frosty wonderland. A noteworthy 4.8" (122mm) of snow covers the city, contributing significantly to the yearly total. The festive season is enhanced by the charming winter landscape, ending the year on a beautiful, wintry note.

Temperature

The onset of December in Cortland comes with a shift in the average high-temperature, falling from a chilly 43.3°F (6.3°C) in November to an icy 33.1°F (0.6°C). In December, Cortland encounters an average low-temperature of 23.7°F (-4.6°C) during the night.

Humidity

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

Rainfall

In Cortland, during December, the rain falls for 8.1 days and regularly aggregates up to 1.5" (38mm) of precipitation. In Cortland, New York, during the entire year, the rain falls for 149.8 days and collects up to 22.36" (568mm) of precipitation.

Snowfall

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

Daylight

With an average of 9h and 6min of daylight, December has the shortest days of the year in Cortland.
On the first day of December in Cortland, New York, sunrise is at 7:15 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:41 pm EST.

Sunshine

The average sunshine in December in Cortland is 2.9h.

UV index

The months with the lowest UV index in Cortland are January, February and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 1 in December leads to these recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The Sun's radiation is especially intense around midday; try to stay in shade during this period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
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Frequently asked questions

How cold is December in Cortland?

December temperatures in Cortland vary between a high-temperature of 33.1°F (0.6°C) and a low-temperature of 23.7°F (-4.6°C).

What is the average humidity in December in Cortland?

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

How much does it rain in Cortland in December?

In December, the rain falls for 8.1 days. Throughout December, 1.5" (38mm) of precipitation is accumulated.

How much does it snow in Cortland in December?

In Cortland, in December, snow falls for 15 days, with typically accumulated 4.8" (122mm) of snow.

What is the month with the shortest days in Cortland?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

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

In December, the average day length is 9h and 7min.

What time are sunrise and sunset in December in Cortland?

On the first day of December in Cortland, sunrise is at 7:15 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 4:41 pm EST.

How long on average sun shines in December in Cortland?

The average sunshine duration in December in Cortland, New York, is 2.9h.

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

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

What is the UV index reading in December in Cortland?

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

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

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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%

The months with the highest relative humidity are January and February (88%).
The 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").
The 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).
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
Cortland, NY

Average daylight in December / Average sunshine in December - Cortland, NY
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 2h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 2h and 24min).

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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

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 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

The months with the most cloud cover are January and February (Cloud cover 74).
The 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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Cortland, New York, USA

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