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 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
The coldest month is January, with an average high-temperature of 7°C (44.6°F) and an average low-temperature of 2.7°C (36.9°F).Humidity
The average relative humidity in January in Castleknock is 89%.Rainfall
In January, in Castleknock, the rain falls for 14.6 days. Throughout January, 36mm (1.42") of precipitation is accumulated. In Castleknock, Ireland, during the entire year, the rain falls for 209.2 days and collects up to 564mm (22.2") of precipitation.Snowfall
January through March, November and December are months with snowfall. In Castleknock, during January, snow falls for 1.4 days and regularly aggregates up to 17mm (0.67") of snow. In Castleknock, during the entire year, snow falls for 7.1 days and aggregates up to 56mm (2.2") of snow.Daylight
In January, the average length of the day is 8h and 10min.On the first day of the month, sunrise is at 8:40 am and sunset at 4:16 pm. On the last day of January, sunrise is at 8:12 am and sunset at 5:05 pm GMT.
Sunshine
The average sunshine in January in Castleknock is 4h.UV index
The months with the lowest UV index in Castleknock are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 2 in January translates into these instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Castleknock?
Is January cold in Castleknock?
What is the average humidity in January in Castleknock?
How many days does it rain in January in Castleknock?
How much does it snow in Castleknock in January?
What is the average length of the day in January in Castleknock?
When are sunrise and sunset in January in Castleknock?
How long on average sun shines in January in Castleknock?
When is the lowest UV index in Castleknock?
How high is the UV index in January in Castleknock?
Average temperature in January
Castleknock, Ireland
- Average high temperature in January: 7°C
The warmest month (with the highest average high temperature) is July (17.3°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in January: 2.7°C
The month with the highest average low temperature is July (11.2°C).
The coldest month (with the lowest average low temperature) is February (2.5°C).
Average pressure in January
Castleknock, Ireland
- Average pressure in January: 1011.5mbar
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
Castleknock, Ireland
- Average wind speed in January: 21.1km/h
The windiest month (with the highest average wind speed) is January (21.1km/h).
The calmest months (with the lowest average wind speed) are June and July (13.6km/h).
Average humidity in January
Castleknock, Ireland
- Average humidity in January: 89%
The month with the highest relative humidity is December (90%).
The months with the lowest relative humidity are March, April and May (85%).
Average rainfall in January
Castleknock, Ireland
- Average rainfall in January: 36mm
The wettest month (with the highest rainfall) is August (71mm).
The driest month (with the least rainfall) is April (30mm).
Average rainfall days in January
Castleknock, Ireland
- Average rainfall days in January: 14.6 days
The month with the highest number of rainy days is August (24.2 days).
The month with the least rainy days is February (13.6 days).
Average snowfall in January
Castleknock, Ireland
- Average snowfall in January: 17mm
The month with the highest snowfall is February (19mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in January
Castleknock, Ireland
- Average snowfall days in January: 1.4 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Castleknock, 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 0min
The months with the most sunshine are April and May (Average sunshine: 6h and 42min).
The months with the least sunshine are February, October and November (Average sunshine: 3h and 54min).
Average sunshine days in January
Castleknock, Ireland
- Average sunshine days in January: 13.2 days
The month with the most sunshine days is January (13.2 days).
The month with the least sunshine days is August (3.4 days).
Average UV index in January
Castleknock, Ireland
- Average UV index in January: 2
The months with the highest UV index are May, June and August (UV index 4).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Castleknock, Ireland
- Average cloud cover in January: 60
The month with the most cloud cover is July (Cloud cover 64).
The month with the least cloud cover is April (Cloud cover 55).
Average visibility in January
Castleknock, Ireland
- Average visibility in January: 9km
The months with the highest visibility are January, February, March, April, May, June, October, November and December (9km).
The months with the lowest visibility are July, August and September (8km).
Castleknock, Ireland
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