December weather forecast
Greystones, Ireland

englishespañol中文
Share

Weather in December

December in Greystones marks the depth of winter with temperatures dropping down to an average low of 5.4°C (41.7°F) and high of 8.5°C (47.3°F). Seven and a half hours of daylight are insufficient to warm up the city significantly. The occurrence and amount of snowfall, specifically 9mm (0.35") over 1.1 days, amplify the winter characteristics of the month. Despite the cold and the reduction of sunlight hours, the city retains its charm, making it a great time to experience the serene, wintry ambience of Greystones.

Temperature

December's average high-temperature in Greystones stands at a chilly 8.5°C (47.3°F), showing little deviation from November's 10.1°C (50.2°F). Greystones's nights throughout December are marked by an average low temperature of 5.4°C (41.7°F), a minor drop from the day's high.

Humidity

In Greystones, the average relative humidity in December is 84%.

Rainfall

In Greystones, in December, it is raining for 17 days, with typically 55mm (2.17") of accumulated precipitation. In Greystones, during the entire year, the rain falls for 200.5 days and collects up to 530mm (20.87") of precipitation.

Snowfall

January through March, November and December are months with snowfall in Greystones. December is the month with the most snowfall. Snow falls for 1.1 days and accumulates 9mm (0.35") of snow.

Sea temperature

In Greystones, the average seawater temperature in December is 11.3°C (52.3°F).
Note: Navigating the 11.3°C (52.3°F) at 13°C (55.4°F) is no joy, and temperatures less than 10°C (50°F) can threaten breathing and cause a chilling shock, gauging personal stamina.

Daylight

December has the shortest days of the year, with an average of 7h and 36min of daylight.
On the first day of the month, sunrise is at 8:16 am and sunset at 4:10 pm. On the last day of December, in Greystones, sunrise is at 8:38 am and sunset at 4:16 pm GMT.

Sunshine

The average sunshine in December in Greystones is 4.6h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Greystones. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 2 during December leads to these advisories:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.

Frequently asked questions

What is the usual temperature for Greystones in December?

The average high-temperature, in December, in Greystones, is 8.5°C (47.3°F), while the average low-temperature is 5.4°C (41.7°F).

What is the average humidity in December in Greystones?

The average relative humidity in December in Greystones, Ireland, is 84%.

How many days does it rain in December in Greystones?

In Greystones, Ireland, in December, during 17 rainfall days, 55mm (2.17") of precipitation is typically accumulated.

What is the snowiest month in Greystones?

The month with the most snowfall in Greystones is December, when snow falls for 1.1 days and typically aggregates up to 9mm (0.35") of snow.

How much does it snow in Greystones in December?

In Greystones, Ireland, in December, during 1.1 snowfall days, 9mm (0.35") of snow is typically accumulated.

What is the water temperature in December in Greystones?

In December, the average sea temperature in Greystones is 11.3°C (52.3°F). Swimming in 11.3°C (52.3°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Greystones?

December has the shortest days of the year in Greystones, with an average of 7h and 36min of daylight.

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

The average day length in December in Greystones is 7h and 38min.

When is the sunrise / sunset in December in Greystones?

In December, on the first day of the month, sunrise is at 8:16 am and sunset at 4:10 pm. On the last day of the month, in Greystones, Ireland, sunrise is at 8:38 am and sunset at 4:16 pm GMT.

How long on average sun shines in December in Greystones?

In December, the average sunshine duration in Greystones is 4.6h.

When is the lowest UV index in Greystones?

The months with the lowest UV index in Greystones, Ireland, are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Greystones?

In December, the average daily maximum UV index in Greystones is 2. A UV Index of 2, and less, symbolizes a low health risk from 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 temperature in December
Greystones, Ireland

Average temperature in December - Greystones, Ireland
  • Average high temperature in December: 8.5°C

The warmest months (with the highest average high temperature) are July and August (16.9°C).
The months with the lowest average high temperature are January and February (7.8°C).

  • Average low temperature in December: 5.4°C

The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is February (4.4°C).

Average pressure in December
Greystones, Ireland

Average pressure in December - Greystones, Ireland
  • Average pressure in December: 1011.1mbar

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
Greystones, Ireland

Average wind speed in December - Greystones, Ireland
  • Average wind speed in December: 25.9km/h

The windiest month (with the highest average wind speed) is December (25.9km/h).
The calmest month (with the lowest average wind speed) is July (15.9km/h).

Average humidity in December
Greystones, Ireland

Average humidity in December - Greystones, Ireland
  • Average humidity in December: 84%

The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is March (82%).

Average rainfall in December
Greystones, Ireland

Average rainfall in December - Greystones, Ireland
  • Average rainfall in December: 55mm

The wettest month (with the highest rainfall) is November (71mm).
The driest month (with the least rainfall) is May (27mm).

Average rainfall days in December
Greystones, Ireland

Average rainfall days in December - Greystones, Ireland
  • Average rainfall days in December: 17 days

The month with the highest number of rainy days is July (20.4 days).
The months with the least rainy days are March and September (14.9 days).

Average snowfall in December
Greystones, Ireland

Average snowfall in December - Greystones, Ireland
  • Average snowfall in December: 9mm

The month with the highest snowfall is December (9mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in December
Greystones, Ireland

Average snowfall days in December - Greystones, Ireland
  • Average snowfall days in December: 1.1 days

The months with the highest number of snowfall days are January and February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average sea temperature in December
Greystones, Ireland

Average sea temperature in December - Greystones, Ireland
  • Average sea temperature in December: 11.3°C

The best month for swimming (with the highest average sea temperature) is August (14.9°C).
The coldest month (with the lowest average sea temperature) is March (8.4°C).

Average daylight in December /
Average sunshine in December
Greystones, Ireland

Average daylight in December / Average sunshine in December - Greystones, Ireland
  • Average daylight in December: 7h and 4min

The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is May (Average sunshine: 8h and 0min).
The month with the least sunshine is November (Average sunshine: 4h and 18min).

Average sunshine days in December
Greystones, Ireland

Average sunshine days in December - Greystones, Ireland
  • Average sunshine days in December: 10.2 days

The month with the most sunshine days is April (11.7 days).
The month with the least sunshine days is July (7.2 days).

Average UV index in December
Greystones, Ireland

Average UV index in December - Greystones, Ireland
  • Average UV index in December: 2

The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Greystones, Ireland

Average cloud cover in December - Greystones, Ireland
  • Average cloud cover in December: 53

The months with the most cloud cover are February and November (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 48).

Average visibility in December
Greystones, Ireland

Average visibility in December - Greystones, Ireland
  • Average visibility in December: 9km

The months with the highest visibility are January, March, October and November (10km).
The months with the lowest visibility are February, April, May, June, July, August, September and December (9km).

Greystones, Ireland

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location