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 sea temperature 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
December
Weather in December
Temperature
Shannon marks the start of December with an average high-temperature of a still frosty 8°C (46.4°F), hinting at a slight fluctuation from November's 9.6°C (49.3°F). In Shannon, the nighttime temperature shows a slight difference from the daytime high, averaging to an icy 3.5°C (38.3°F) during December.Humidity
November and December, with an average relative humidity of 90%, are the most humid months in Shannon.Rainfall
The month with the most rainfall is December, when the rain falls for 16.1 days and typically aggregates up to 56mm (2.2") of precipitation.Snowfall
January through March and December are months with snowfall. The month with the most snowfall is December, when snow falls for 0.6 days and typically aggregates up to 21mm (0.83") of snow.Sea temperature
In Shannon, Ireland, the average seawater temperature in December is 11.2°C (52.2°F).Note: Staying in 11.2°C (52.2°F) waters for just a few moments at 13°C (55.4°F) can be harrowing, and below 10°C (50°F) poses breathing and cold shock risks, depending on individual tolerance.
Daylight
The month with the shortest days is December, with an average of 7h and 42min of daylight.On the first day of the month, sunrise is at 8:25 am and sunset at 4:24 pm. On the last day of December, sunrise is at 8:47 am and sunset at 4:30 pm GMT.
Sunshine
January and December, with an average of 4h of sunshine, are months with the least sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Shannon. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. To protect against the Sun's most potent rays, avoid direct exposure around midday. Boost your sun resistance with garments that are densely woven yet spacious. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Shannon?
What is the most humid month in Shannon?
What is the average humidity in December in Shannon?
What is the wettest month in Shannon?
How many days does it rain in December in Shannon?
When does it snow the most in Shannon?
When does it start to snow in Shannon?
What is the water temperature in December in Shannon?
What is the month with the shortest days in Shannon?
What is the average length of the day in December in Shannon?
When are sunrise and sunset in December in Shannon?
What is the month with the least sunshine in Shannon?
How many hours of sunshine does Shannon have in December?
When is the lowest UV index in Shannon?
What is the UV index intensity in December in Shannon?
Average temperature in December
Shannon, Ireland
- Average high temperature in December: 8°C
The warmest month (with the highest average high temperature) is July (18°C).
The month with the lowest average high temperature is January (7.8°C).
- Average low temperature in December: 3.5°C
The month with the highest average low temperature is July (11.1°C).
The coldest months (with the lowest average low temperature) are February and March (2.9°C).
Average pressure in December
Shannon, Ireland
- Average pressure in December: 1011mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed in December
Shannon, Ireland
- Average wind speed in December: 18.8km/h
The windiest month (with the highest average wind speed) is February (19km/h).
The calmest month (with the lowest average wind speed) is July (13.3km/h).
Average humidity in December
Shannon, Ireland
- Average humidity in December: 90%
The months with the highest relative humidity are November and December (90%).
The month with the lowest relative humidity is April (84%).
Average rainfall in December
Shannon, Ireland
- Average rainfall in December: 56mm
The wettest month (with the highest rainfall) is December (56mm).
The driest month (with the least rainfall) is September (33mm).
Average rainfall days in December
Shannon, Ireland
- Average rainfall days in December: 16.1 days
The month with the highest number of rainy days is August (20.4 days).
The month with the least rainy days is February (14.8 days).
Average snowfall in December
Shannon, Ireland
- Average snowfall in December: 21mm
The month with the highest snowfall is December (21mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Shannon, Ireland
- Average snowfall days in December: 0.6 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average sea temperature in December
Shannon, Ireland
- Average sea temperature in December: 11.2°C
The best month for swimming (with the highest average sea temperature) is August (15.8°C).
The coldest month (with the lowest average sea temperature) is March (9.4°C).
Average daylight in December /
Average sunshine in December
Shannon, Ireland
- Average daylight in December: 7h and 4min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is June (Average sunshine: 7h and 18min).
The months with the least sunshine are January and December (Average sunshine: 4h and 0min).
Average sunshine days in December
Shannon, Ireland
- Average sunshine days in December: 12.6 days
The month with the most sunshine days is December (12.6 days).
The month with the least sunshine days is July (7.6 days).
Average UV index in December
Shannon, Ireland
- Average UV index in December: 2
The months with the highest UV index are May and June (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Shannon, Ireland
- Average cloud cover in December: 61
The month with the most cloud cover is July (Cloud cover 67).
The month with the least cloud cover is April (Cloud cover 56).
Average visibility in December
Shannon, Ireland
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, November and December (9km).
The months with the lowest visibility are May, June, July, August, September and October (8km).
