Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
In Greystones, January and February are characterised by the lowest temperatures, recording an average high of 7.8°C (46°F).Humidity
The average relative humidity in January is 84%.Rainfall
In Greystones, in January, it is raining for 16.6 days, with typically 41mm (1.61") 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
Months with snowfall in Greystones are January through March, November and December. In Greystones, in January, during 1.3 snowfall days, 5mm (0.2") of snow is typically accumulated. In Greystones, Ireland, during the entire year, snow falls for 4.6 days and aggregates up to 24mm (0.94") of snow.Sea temperature
In January, the average sea temperature is 9.6°C (49.3°F).Note: Caution: 9.6°C (49.3°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.
Daylight
The average length of the day in January in Greystones, Ireland, is 8h and 13min.On the first day of January, sunrise is at 8:38 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 8:10 am and sunset at 5:05 pm GMT.
Sunshine
The average sunshine in January is 4.4h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 2 in January leads to these recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Direct Sun exposure should be minimized especially during midday when radiation is most intense. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What is the coldest time of year in Greystones?
What is the average January temperature in Greystones?
What is the average humidity in January in Greystones?
How much does it rain in Greystones in January?
How many days does it snow in January in Greystones?
What is the sea water temperature in January in Greystones?
How many hours of daylight does Greystones have in January?
When are sunrise and sunset in January in Greystones?
How many hours of sunshine does Greystones have in January?
When is the lowest UV index in Greystones?
How high is the UV index in January in Greystones?
Average temperature in January
Greystones, Ireland
- Average high temperature in January: 7.8°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 January: 4.5°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 January
Greystones, Ireland
- Average pressure in January: 1011.6mbar
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 January
Greystones, Ireland
- Average wind speed in January: 25.8km/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 January
Greystones, Ireland
- Average humidity in January: 84%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is March (82%).
Average rainfall in January
Greystones, Ireland
- Average rainfall in January: 41mm
The wettest month (with the highest rainfall) is November (71mm).
The driest month (with the least rainfall) is May (27mm).
Average rainfall days in January
Greystones, Ireland
- Average rainfall days in January: 16.6 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 January
Greystones, Ireland
- Average snowfall in January: 5mm
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 January
Greystones, Ireland
- Average snowfall days in January: 1.3 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 January
Greystones, Ireland
- Average sea temperature in January: 9.6°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 January /
Average sunshine in January
Greystones, Ireland
- Average daylight in January: 8h and 1min
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 January: 4h and 2min
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 January
Greystones, Ireland
- Average sunshine days in January: 10.9 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 January
Greystones, Ireland
- Average UV index in January: 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 January
Greystones, Ireland
- Average cloud cover in January: 55
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 January
Greystones, Ireland
- Average visibility in January: 10km
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
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