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
December brings a drop in Cortland's average high-temperature, falling from a chilly 43.3°F (6.3°C) in November to a wintry 33.1°F (0.6°C). Throughout December, Cortland records an average temperature of 23.7°F (-4.6°C) at 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, during the entire year, the rain falls for 149.8 days and collects up to 22.36" (568mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Cortland, in December, during 15 snowfall days, 4.8" (122mm) of snow is typically accumulated. In Cortland, during the entire year, snow falls for 79.7 days and aggregates up to 24.06" (611mm) 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 December, 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
In December, the average sunshine is 2.9h.UV index
January, February and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 1 translates into these guidelines:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Cortland have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Cortland have in December?
What are the months with the lowest UV index?
How high is the UV index in December?
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).
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).
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).
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%).
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").
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).
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").
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).
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).
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).
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).
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).
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).
Cortland, New York, USA
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