Climate and monthly weather forecastCastleknock, Ireland
Climate and monthly weather forecast
Weather in January
January, the same as December, in Castleknock, Ireland, is a frosty winter month, with temperature in the range of an average low of 2.7°C (36.9°F) and an average high of 7°C (44.6°F). 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). Weather in January »Weather in February
February, the last month of the winter in Castleknock, is also a frosty month, with temperature in the range of an average high of 7.3°C (45.1°F) and an average low of 2.5°C (36.5°F). The shift from January to February is characterized by an average high-temperature of a still chilly 7.3°C (45.1°F), not significantly different from the 7°C (44.6°F) of January. Weather in February »Weather in March
The first month of the spring, March, is also a frosty month in Castleknock, Ireland, with an average temperature ranging between max 8.8°C (47.8°F) and min 2.8°C (37°F). With the onset of March, Castleknock's average high-temperature clocks in at a still chilly 8.8°C (47.8°F), showing a minor fluctuation from the previous month. Weather in March »Weather in April
April in Castleknock, Ireland, is a cool spring month, with an average temperature ranging between max 10.9°C (51.6°F) and min 4.6°C (40.3°F). Castleknock's average high-temperature in April sits at a fresh 10.9°C (51.6°F), showing little difference from the previous month. Weather in April »Weather in May
May, the last month of the spring in Castleknock, is a moderate month, with an average temperature fluctuating between 6.8°C (44.2°F) and 13.5°C (56.3°F). As May takes hold, the average high-temperature is a refreshing 13.5°C (56.3°F), nearly mirroring that of the previous month. Weather in May »Weather in June
June, the first month of the summer in Castleknock, is an enjoyable month, with an average temperature varying between 9.3°C (48.7°F) and 16°C (60.8°F). Castleknock records an average high-temperature of a still refreshing 16°C (60.8°F) in June, closely mirroring the climate of the previous month. Weather in June »Weather in July
July, the same as June, is another comfortable summer month in Castleknock, Ireland, with an average temperature ranging between max 17.3°C (63.1°F) and min 11.2°C (52.2°F). During the warmest month, July, temperatures average a high of 17.3°C (63.1°F) and a low of 11.2°C (52.2°F). Weather in July »Weather in August
The last month of the summer, August, is another comfortable month in Castleknock, Ireland, with an average temperature varying between 11°C (51.8°F) and 17.1°C (62.8°F). Castleknock sees the arrival of August with an average high-temperature of a still enjoyable 17.1°C (62.8°F), indicating a subtle variation from July. Weather in August »Weather in September
The first month of the autumn, September, is also a moderate month in Castleknock, Ireland, with an average temperature varying between 15.3°C (59.5°F) and 9.1°C (48.4°F). The shift into September finds Castleknock at an average high-temperature of a moderate 15.3°C (59.5°F), closely comparable to August's conditions. Weather in September »Weather in October
October, like September, in Castleknock, Ireland, is a cool autumn month, with an average temperature ranging between max 12.8°C (55°F) and min 8°C (46.4°F). As September transitions into October, the average high-temperature rests at a fresh 12.8°C (55°F), maintaining a close resemblance to the previous month. Weather in October »Weather in November
November, the last month of the autumn in Castleknock, is also a frosty month, with an average temperature fluctuating between 4.8°C (40.6°F) and 9.1°C (48.4°F). November ushers in a minor alteration in Castleknock's climate, with the average high-temperature moving from October's fresh 12.8°C (55°F) to a frosty 9.1°C (48.4°F). Weather in November »Weather in December
December, the first month of the winter in Castleknock, is still a chilly month, with temperature in the range of an average low of 3.4°C (38.1°F) and an average high of 7.1°C (44.8°F). December reports an average high-temperature of a still frosty 7.1°C (44.8°F), slightly varied from November's 9.1°C (48.4°F). Weather in December »Updated: Jan 27, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January stands out as Castleknock's coldest month, with temperatures ranging between an average high of 7°C (44.6°F) and a low of 2.7°C (36.9°F).
In Castleknock, Ireland, during the entire year, the rain falls for 209.2 days and collects up to 564mm (22.2") of precipitation.
January through March, November and December are months with snowfall.
In Castleknock, during the entire year, snow falls for 7.1 days and aggregates up to 56mm (2.2") of snow.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Castleknock.
February is the month with the most snowfall in Castleknock, Ireland. Snow falls for 2.4 days and accumulates 19mm (0.75") of snow.
February, October and November, with an average of 3.9h of sunshine, are months with the least sunshine.
The months with the lowest humidity in Castleknock are March through May, with an average relative humidity of 85%.
April is the month with the least rainfall in Castleknock. Rain falls for 16.8 days and accumulates 30mm (1.18") of precipitation.
In Castleknock, snow does not fall in April through October.
April and May, with an average of 6.7h of sunshine, are months with the most sunshine.
The months with the highest UV index are May, June and August, with an average maximum UV index of 4.
The month with the longest days in Castleknock is June, with an average of 16h and 54min of daylight.
Castleknock notes the warmest temperatures in July, with a average high of 17.3°C (63.1°F) and a low of 11.2°C (52.2°F).
The month with the most rainfall is August, when the rain falls for 24.2 days and typically aggregates up to 71mm (2.8") of precipitation.
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time starts in Castleknock, Ireland, and the time zone changes from IST to GMT. Daylight Saving Time ends on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to IST.
December is the most humid month in Castleknock, with an average relative humidity of 90%.
The month with the shortest days in Castleknock, Ireland, is December, with an average of 7h and 36min of daylight.
Average temperature
Castleknock, Ireland
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).
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
Castleknock, Ireland
- Average pressure in January:
1011.5mbar - Average pressure in February:
1011.1mbar - Average pressure in March:
1014.1mbar - Average pressure in April:
1014.8mbar - Average pressure in May:
1016mbar - Average pressure in June:
1015.3mbar
- Average pressure in July:
1014mbar - Average pressure in August:
1012.8mbar - Average pressure in September:
1015.3mbar - Average pressure in October:
1012.7mbar - Average pressure in November:
1008.3mbar - Average pressure in December:
1011mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed
Castleknock, Ireland
- Average wind speed in January:
21.1km/h - Average wind speed in February:
20.8km/h - Average wind speed in March:
18.5km/h - Average wind speed in April:
15.6km/h - Average wind speed in May:
15.5km/h - Average wind speed in June:
13.6km/h
- Average wind speed in July:
13.6km/h - Average wind speed in August:
14.8km/h - Average wind speed in September:
15.3km/h - Average wind speed in October:
16.7km/h - Average wind speed in November:
18.9km/h - Average wind speed in December:
21km/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
Castleknock, Ireland
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
Castleknock, Ireland
The wettest month (with the highest rainfall) is August (71mm).
The driest month (with the least rainfall) is April (30mm).
Average rainfall days
Castleknock, Ireland
- Average rainfall days in January:
14.6 days - Average rainfall days in February:
13.6 days - Average rainfall days in March:
15.4 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
19 days - Average rainfall days in June:
19 days
- Average rainfall days in July:
23.3 days - Average rainfall days in August:
24.2 days - Average rainfall days in September:
17.8 days - Average rainfall days in October:
16 days - Average rainfall days in November:
14.6 days - Average rainfall days in December:
14.9 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
Castleknock, Ireland
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
Castleknock, Ireland
- Average snowfall days in January:
1.4 days - Average snowfall days in February:
2.4 days - Average snowfall days in March:
1.9 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.2 days - Average snowfall days in December:
1.2 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 / Average sunshine
Castleknock, Ireland
- Average daylight in January:
8h and 12min - Average daylight in February:
9h and 54min - Average daylight in March:
11h and 54min - Average daylight in April:
14h and 0min - Average daylight in May:
15h and 54min - Average daylight in June:
16h and 54min
- Average daylight in July:
16h and 24min - Average daylight in August:
14h and 42min - Average daylight in September:
12h and 42min - Average daylight in October:
10h and 36min - Average daylight in November:
8h and 42min - Average daylight in December:
7h and 36min
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 - Average sunshine in February:
3h and 54min - Average sunshine in March:
5h and 6min - Average sunshine in April:
6h and 42min - Average sunshine in May:
6h and 42min - Average sunshine in June:
6h and 36min
- Average sunshine in July:
6h and 0min - Average sunshine in August:
6h and 18min - Average sunshine in September:
6h and 6min - Average sunshine in October:
3h and 54min - Average sunshine in November:
3h and 54min - Average sunshine in December:
4h and 12min
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
Castleknock, Ireland
- Average sunshine days in January:
13.2 days - Average sunshine days in February:
11.1 days - Average sunshine days in March:
11.6 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
9.5 days - Average sunshine days in June:
8.1 days
- Average sunshine days in July:
5.3 days - Average sunshine days in August:
3.4 days - Average sunshine days in September:
9 days - Average sunshine days in October:
10.8 days - Average sunshine days in November:
12.8 days - Average sunshine days in December:
13 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
Castleknock, Ireland
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
Castleknock, Ireland
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
Castleknock, Ireland
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).
