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
The commencement of December indicates a shift in the average high-temperature, receding from November's fresh 50.9°F (10.5°C) to a cold 41.9°F (5.5°C). In December, Old Lyme records an average nighttime temperature of 32.4°F (0.2°C).Humidity
In December, the average relative humidity in Old Lyme, Connecticut, is 75%.Rainfall
December is the month with the most rainfall. Rain falls for 9.5 days and accumulates 0.94" (24mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Old Lyme. In December, in Old Lyme, Connecticut, it is snowing for 3.2 days. Throughout December, 0.28" (7mm) of snow is accumulated. Throughout the year, there are 18.4 snowfall days, and 1.69" (43mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:56 am and sunset at 4:20 pm. On the last day of December, in Old Lyme, sunrise is at 7:15 am and sunset at 4:30 pm EST.
Sunshine
The months with the least sunshine in Old Lyme are February and December, with an average of 4.8h of sunshine.UV index
The months with the lowest UV index in Old Lyme, Connecticut, are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 2 suggests this advice:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
Is December cold in Old Lyme?
What is the average humidity in December in Old Lyme?
What is the wettest month in Old Lyme?
How many days does it rain in December in Old Lyme?
How many days does it snow in December in Old Lyme?
What is the month with the shortest days in Old Lyme?
How many hours of daylight does Old Lyme have in December?
When is the sunrise / sunset in December in Old Lyme?
What are the months with the least sunshine in Old Lyme?
How many hours of sunshine does Old Lyme have in December?
What are the months with the lowest UV index in Old Lyme?
What is the UV index intensity in December in Old Lyme?
Average temperature in December
Old Lyme, CT
- Average high temperature in December: 41.9°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (35.4°F).
- Average low temperature in December: 32.4°F
The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in December
Old Lyme, CT
- Average pressure in December: 30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Old Lyme, CT
- Average wind speed in December: 10.7mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in December
Old Lyme, CT
- Average humidity in December: 75%
The months with the highest relative humidity are June and July (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in December
Old Lyme, CT
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is December (0.94").
The driest month (with the least rainfall) is September (0.35").
Average rainfall days in December
Old Lyme, CT
- Average rainfall days in December: 9.5 days
The month with the highest number of rainy days is July (11.5 days).
The months with the least rainy days are February and November (6.6 days).
Average snowfall in December
Old Lyme, CT
- Average snowfall in December: 0.28"
The month with the highest snowfall is March (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Old Lyme, CT
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Old Lyme, CT
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).
Average sunshine days in December
Old Lyme, CT
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is July (15.8 days).
Average UV index in December
Old Lyme, CT
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Old Lyme, CT
- Average cloud cover in December: 48
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Old Lyme, CT
- 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).
Old Lyme, Connecticut, USA
Weather forecast for your location
2. Allow the app to use your location
