December weather forecast
Lyons, NY

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Weather in December

December, the first month of the winter in Lyons, is also a wintry month, with an average temperature varying between 27.1°F (-2.7°C) and 36°F (2.2°C).

Temperature

The decrease of average high-temperatures is mild in December, with a decline from a frosty 46.2°F (7.9°C) in November to a wintry 36°F (2.2°C). December introduces a small decrease to a nighttime average of 27.1°F (-2.7°C).

Humidity

In Lyons, the average relative humidity in December is 83%.

Rainfall

In Lyons, during December, the rain falls for 7.2 days and regularly aggregates up to 1.02" (26mm) of precipitation. Throughout the year, there are 133.6 rainfall days, and 14.45" (367mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Lyons. In Lyons, during December, snow falls for 10.9 days and regularly aggregates up to 1.81" (46mm) of snow. Throughout the year, there are 53.8 snowfall days, and 10.51" (267mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 6min of daylight.
On the first day of December in Lyons, sunrise is at 7:20 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:43 pm EST.

Sunshine

The average sunshine in December is 3h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.
Note: A daily high UV index of 1 in December leads to these guidelines:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Avoiding the Sun during its peak radiation time around midday is a healthy practice. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

The high-temperature, in December, in Lyons, is 36°F (2.2°C), while the low-temperature averages to 27.1°F (-2.7°C).

What is the average humidity in December in Lyons?

The average relative humidity in December is 83%.

How much does it rain in December?

In Lyons, during December, the rain falls for 7.2 days and regularly aggregates up to 1.02" (26mm) of precipitation.

How many days does it snow in December?

In Lyons, in December, during 10.9 snowfall days, 1.81" (46mm) of snow is typically accumulated.

What is the month with the shortest days?

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

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

In December, the average day length is 9h and 4min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:20 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:43 pm EST.

How many hours of sunshine does Lyons have in December?

The average sunshine duration in December is 3h.

What is the month with the lowest UV index?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index reading in December?

The average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents 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
Lyons, NY

Average temperature in December - Lyons, NY
  • Average high temperature in December: 36°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 27.1°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).

Average pressure in December
Lyons, NY

Average pressure in December - Lyons, 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).

Average wind speed in December
Lyons, NY

Average wind speed in December - Lyons, NY
  • Average wind speed in December: 10.4mph

The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

Average humidity in December
Lyons, NY

Average humidity in December - Lyons, NY
  • Average humidity in December: 83%

The month with the highest relative humidity is February (85%).
The months with the lowest relative humidity are April and September (77%).

Average rainfall in December
Lyons, NY

Average rainfall in December - Lyons, NY
  • Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is October (1.81").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in December
Lyons, NY

Average rainfall days in December - Lyons, NY
  • Average rainfall days in December: 7.2 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (5.1 days).

Average snowfall in December
Lyons, NY

Average snowfall in December - Lyons, NY
  • Average snowfall in December: 1.81"

The month with the highest snowfall is February (2.8").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Lyons, NY

Average snowfall days in December - Lyons, NY
  • Average snowfall days in December: 10.9 days

The month with the highest number of snowfall days is January (13.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Lyons, 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: 3h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 2h and 36min).

Average sunshine days in December
Lyons, NY

Average sunshine days in December - Lyons, NY
  • Average sunshine days in December: 14.6 days

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is August (12.3 days).

Average UV index in December
Lyons, NY

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Lyons, NY

Average cloud cover in December - Lyons, NY
  • Average cloud cover in December: 70

The month with the most cloud cover is January (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 29).

Average visibility in December
Lyons, NY

Average visibility in December - Lyons, NY
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Lyons, New York, USA

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