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 January, the average high-temperature registers at a still frosty 8.3°C (46.9°F), nearly identical to December's 9.5°C (49.1°F). In Holyhead, the average low-temperature during January nights tends to settle at a still frosty 6.2°C (43.2°F), indicating a slight drop from the daytime peak.Humidity
In Holyhead, the average relative humidity in January is 80%.Rainfall
In Holyhead, in January, it is raining for 21.1 days, with typically 64mm (2.52") of accumulated precipitation. In Holyhead, during the entire year, the rain falls for 233.6 days and collects up to 739mm (29.09") of precipitation.Snowfall
Months with snowfall in Holyhead are January through March, November and December. The months with the most snowfall are January and December, with an average 4mm (0.16") of accumulated snow.Sea temperature
In Holyhead, in January, the average water temperature is 9°C (48.2°F).Note: One needs to be cautious in 9°C (48.2°F) waters. 13°C (55.4°F) is already forbidding, but sub-10°C (14°F) can seriously disrupt your breathing and lead to a frigid shock, considering one's well-being.
Daylight
The average length of the day in January in Holyhead is 8h and 11min.On the first day of the month, sunrise is at 8:33 am and sunset at 4:10 pm. On the last day of January, sunrise is at 8:05 am and sunset at 4:58 pm GMT.
Sunshine
In January, the average sunshine in Holyhead is 3.7h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: In January, the maximum UV index of 2 suggests this advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Frequently asked questions
What are the temperatures in Holyhead in January?
What is the average humidity in January in Holyhead?
How much does it rain in Holyhead in January?
When does it snow the most in Holyhead?
How much does it snow in Holyhead in January?
What is the water temperature in January in Holyhead?
How many hours of daylight does Holyhead have in January?
When is the sunrise / sunset in January in Holyhead?
How many hours of sunshine does Holyhead have in January?
What is the month with the lowest UV index in Holyhead?
How high is the UV index in January in Holyhead?
Average temperature in January
Holyhead, United Kingdom
- Average high temperature in January: 8.3°C
The warmest month (with the highest average high temperature) is August (16.6°C).
The month with the lowest average high temperature is February (7.8°C).
- Average low temperature in January: 6.2°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is February (5.8°C).
Average pressure in January
Holyhead, United Kingdom
- Average pressure in January: 1012.1mbar
The month with the highest atmospheric pressure is May (1016.1mbar).
The month with the lowest atmospheric pressure is November (1008.7mbar).
Average wind speed in January
Holyhead, United Kingdom
- Average wind speed in January: 29.4km/h
The windiest month (with the highest average wind speed) is December (31.3km/h).
The calmest month (with the lowest average wind speed) is June (18.7km/h).
Average humidity in January
Holyhead, United Kingdom
- Average humidity in January: 80%
The months with the highest relative humidity are July and August (84%).
The month with the lowest relative humidity is November (79%).
Average rainfall in January
Holyhead, United Kingdom
- Average rainfall in January: 64mm
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is May (36mm).
Average rainfall days in January
Holyhead, United Kingdom
- Average rainfall days in January: 21.1 days
The month with the highest number of rainy days is August (23.4 days).
The month with the least rainy days is April (15.6 days).
Average snowfall in January
Holyhead, United Kingdom
- Average snowfall in January: 4mm
The months with the highest snowfall are January and December (4mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in January
Holyhead, United Kingdom
- Average snowfall days in January: 1 days
The month with the highest number of snowfall days is January (1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in January
Holyhead, United Kingdom
- Average sea temperature in January: 9°C
The best month for swimming (with the highest average sea temperature) is September (15.2°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight in January /
Average sunshine in January
Holyhead, United Kingdom
- 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: 3h and 4min
The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 36min).
Average sunshine days in January
Holyhead, United Kingdom
- Average sunshine days in January: 6.3 days
The month with the most sunshine days is May (12.3 days).
The month with the least sunshine days is December (4.3 days).
Average UV index in January
Holyhead, United Kingdom
- 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 and December (UV index 2).
Average cloud cover in January
Holyhead, United Kingdom
- Average cloud cover in January: 63
The month with the most cloud cover is December (Cloud cover 65).
The month with the least cloud cover is May (Cloud cover 46).
Average visibility in January
Holyhead, United Kingdom
- Average visibility in January: 9km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
Holyhead, United Kingdom
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