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
A subtle decrease in the average high-temperature marks December, falling from November's frosty 45°F (7.2°C) to a cold 34.2°F (1.2°C). During December, Grafton witnesses a consistent average low-temperature of 23.9°F (-4.5°C).Humidity
The average relative humidity in December in Grafton is 82%.Rainfall
In Grafton, New York, in December, during 9.5 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. In Grafton, during the entire year, the rain falls for 140.6 days and collects up to 24.17" (614mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Grafton, during December, snow falls for 7.9 days and regularly aggregates up to 4.53" (115mm) of snow. In Grafton, during the entire year, snow falls for 44.8 days and aggregates up to 23.27" (591mm) 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 the month, sunrise is at 7:05 am and sunset at 4:20 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:30 pm EST.
Sunshine
The average sunshine in December in Grafton is 4.3h.UV index
The months with the lowest UV index in Grafton are January through March, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Grafton?
What is the average humidity in December in Grafton?
How much does it rain in Grafton in December?
How much does it snow in Grafton in December?
What is the month with the shortest days in Grafton?
What is the average length of the day in December in Grafton?
When is the sunrise / sunset in December in Grafton?
How long on average sun shines in December in Grafton?
When is the lowest UV index in Grafton?
What is the UV index intensity in December in Grafton?
Average temperature in December
Grafton, NY
- Average high temperature in December: 34.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in December: 23.9°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in December
Grafton, 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
Grafton, NY
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are January and February (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in December
Grafton, NY
- Average humidity in December: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Grafton, NY
- Average rainfall in December: 1.89"
The wettest months (with the highest rainfall) are May and October (2.52").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in December
Grafton, NY
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in December
Grafton, NY
- Average snowfall in December: 4.53"
The month with the highest snowfall is February (5.83").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Grafton, NY
- Average snowfall days in December: 7.9 days
The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Grafton, 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: 4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in December
Grafton, NY
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (12.9 days).
Average UV index in December
Grafton, NY
- Average UV index in December: 2
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, March, October, November and December (UV index 2).
Average cloud cover in December
Grafton, NY
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in December
Grafton, NY
- Average visibility in December: 6mi
The months with the highest visibility are April, July, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, August, September and October (5mi).
Grafton, New York, USA
Weather forecast for your location
2. Allow the app to use your location