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
January
Weather in January
Temperature
January is the month when Portmarnock, Ireland, sees the lowest average temperatures, with a high of 7.6°C (45.7°F) and a low of 4°C (39.2°F).Humidity
In January, the average relative humidity in Portmarnock, Ireland, is 85%.Rainfall
In January, the rain falls for 11.5 days. Throughout January, 20mm (0.79") of precipitation is accumulated. In Portmarnock, during the entire year, the rain falls for 159.4 days and collects up to 362mm (14.25") of precipitation.Snowfall
January through March, November and December are months with snowfall. In Portmarnock, Ireland, in January, during 1.8 snowfall days, 5mm (0.2") of snow is typically accumulated. Throughout the year, there are 6 snowfall days, and 31mm (1.22") of snow is accumulated.Sea temperature
In January, the average sea temperature is 9.6°C (49.3°F).Note: Taking a dip in 9.6°C (49.3°F) can be perilous. Submersion in temperatures under 10°C (50°F) triggers severe cold shock accompanied by hyperventilation.
Daylight
In Portmarnock, the average length of the day in January is 8h and 10min.On the first day of the month, sunrise is at 8:40 am and sunset at 4:15 pm. On the last day of January, sunrise is at 8:11 am and sunset at 5:04 pm GMT.
Sunshine
The months with the least sunshine in Portmarnock are January, February and November, with an average of 4.3h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Portmarnock, Ireland. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 2 in January transforms into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest in Portmarnock?
What are January temperatures in Portmarnock?
What is the average humidity in January in Portmarnock?
How much does it rain in Portmarnock in January?
How much does it snow in Portmarnock in January?
How cold is the water in January in Portmarnock?
What is the average length of the day in January in Portmarnock?
When are sunrise and sunset in January in Portmarnock?
What is the month with the least sunshine in Portmarnock?
How long on average sun shines in January in Portmarnock?
What is the month with the lowest UV index in Portmarnock?
What is the UV index intensity in January in Portmarnock?
Average temperature in January
Portmarnock, Ireland
- Average high temperature in January: 7.6°C
The warmest month (with the highest average high temperature) is July (17.4°C).
The month with the lowest average high temperature is January (7.6°C).
- Average low temperature in January: 4°C
The months with the highest average low temperature are July and August (12.1°C).
The coldest months (with the lowest average low temperature) are February and March (3.9°C).
Average pressure in January
Portmarnock, Ireland
- Average pressure in January: 1011.4mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.2mbar).
Average wind speed in January
Portmarnock, Ireland
- Average wind speed in January: 24.2km/h
The windiest month (with the highest average wind speed) is January (24.2km/h).
The calmest month (with the lowest average wind speed) is June (15.2km/h).
Average humidity in January
Portmarnock, Ireland
- Average humidity in January: 85%
The months with the highest relative humidity are July and December (86%).
The months with the lowest relative humidity are March, April and May (83%).
Average rainfall in January
Portmarnock, Ireland
- Average rainfall in January: 20mm
The wettest month (with the highest rainfall) is November (51mm).
The driest month (with the least rainfall) is May (19mm).
Average rainfall days in January
Portmarnock, Ireland
- Average rainfall days in January: 11.5 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (10.7 days).
Average snowfall in January
Portmarnock, Ireland
- Average snowfall in January: 5mm
The month with the highest snowfall is December (12mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in January
Portmarnock, Ireland
- Average snowfall days in January: 1.8 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in January
Portmarnock, 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
Portmarnock, 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 months with the most sunshine are April, May and June (Average sunshine: 7h and 30min).
The months with the least sunshine are January, February and November (Average sunshine: 4h and 18min).
Average sunshine days in January
Portmarnock, Ireland
- Average sunshine days in January: 16.8 days
The months with the most sunshine days are January and December (16.8 days).
The month with the least sunshine days is July (11 days).
Average UV index in January
Portmarnock, 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
Portmarnock, Ireland
- Average cloud cover in January: 57
The months with the most cloud cover are January and February (Cloud cover 57).
The months with the least cloud cover are April and September (Cloud cover 50).
Average visibility in January
Portmarnock, Ireland
- Average visibility in January: 10km
The months with the highest visibility are January, February, March, October, November and December (10km).
The months with the lowest visibility are April, May, June, July, August and September (9km).
