December weather forecastJamestown, NY
December
Weather in December
December firmly establishes the winter climate in Jamestown. With chilly temperatures hovering around the average low of 25.9°F (-3.4°C), December is far removed from the warm, balmy months of summer. Snowfall increases and puts the city into full winter mode. The days turn out to be shorter, thus receiving less sunlight. Regardless of the cold weather, Christmas and New Year festivities fill the air with excitement, and snowfall adds to the holiday charm.Temperature
Jamestown's weather changes with the onset of December, slightly falling from a chilly 43.7°F (6.5°C) in November to a wintry 34.5°F (1.4°C). In Jamestown, the nocturnal temperatures throughout December show a marginal dip from the daytime averages, settling at a subzero cold 25.9°F (-3.4°C).Humidity
In December, the average relative humidity in Jamestown is 87%.Rainfall
In Jamestown, in December, during 9.8 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. Throughout the year, there are 163.4 rainfall days, and 27.72" (704mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Jamestown. The month with the most snowfall is December, when snow falls for 17.1 days and typically aggregates up to 7.68" (195mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 12min of daylight.On the first day of December, sunrise is at 7:26 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 4:55 pm EST.
Sunshine
In Jamestown, New York, the average sunshine in December is 2.4h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 1 during December leads to these advisories:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Jamestown, NY
- Average high temperature in December: 34.5°F
The warmest month (with the highest average high temperature) is July (75.9°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in December: 25.9°F
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in December
Jamestown, 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
Jamestown, NY
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in December
Jamestown, NY
- Average humidity in December: 87%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are April, May and September (81%).
Average rainfall in December
Jamestown, NY
- Average rainfall in December: 2.24"
The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in December
Jamestown, NY
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is January (6.9 days).
Average snowfall in December
Jamestown, NY
- Average snowfall in December: 7.68"
The month with the highest snowfall is December (7.68").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Jamestown, NY
- Average snowfall days in December: 17.1 days
The month with the highest number of snowfall days is January (20.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jamestown, NY
- Average daylight in December: 9h and 12min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 2h and 24min
The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Jamestown, NY
- Average sunshine days in December: 6.1 days
The month with the most sunshine days is September (12.5 days).
The month with the least sunshine days is January (5.6 days).
Average UV index in December
Jamestown, 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 and December (UV index 1).
Average cloud cover in December
Jamestown, NY
- Average cloud cover in December: 76
The month with the most cloud cover is January (Cloud cover 79).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in December
Jamestown, NY
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (4mi).
