Climate and monthly weather forecastCaernarfon, United Kingdom
Climate and monthly weather forecast
Weather in January
January, like December, is a frosty winter month in Caernarfon, United Kingdom, with an average temperature varying between 7.1°C (44.8°F) and 4.5°C (40.1°F). January's climate shows a minor adjustment in average high-temperatures to a still chilly 7.1°C (44.8°F) from December's 8.5°C (47.3°F). Weather in January »Weather in February
February, the last month of the winter in Caernarfon, is also a frosty month, with an average temperature fluctuating between 7°C (44.6°F) and 4.3°C (39.7°F). February is the month when Caernarfon experiences its coldest temperatures, averaging a high of 7°C (44.6°F) and a low of 4.3°C (39.7°F). Weather in February »Weather in March
March, the first month of the spring in Caernarfon, is still a chilly month, with temperature in the range of an average low of 4.7°C (40.5°F) and an average high of 8.3°C (46.9°F). Welcoming March, Caernarfon notes an average high-temperature of a still frosty 8.3°C (46.9°F), nearly consistent with February's 7°C (44.6°F). Weather in March »Weather in April
April in Caernarfon, United Kingdom, is a fresh spring month, with an average temperature varying between 10.6°C (51.1°F) and 6.3°C (43.3°F). The transition into April is marked with an average high-temperature of a cool 10.6°C (51.1°F), showing an insignificant shift from March's 8.3°C (46.9°F). Weather in April »Weather in May
May, the last month of the spring in Caernarfon, is also a fresh month, with temperature in the range of an average low of 8.3°C (46.9°F) and an average high of 12.9°C (55.2°F). An average high-temperature of a still fresh 12.9°C (55.2°F) marks May, exhibiting a close resemblance to the conditions in April. Weather in May »Weather in June
The first month of the summer, June, is a moderate month in Caernarfon, United Kingdom, with temperature in the range of an average high of 15.2°C (59.4°F) and an average low of 10.6°C (51.1°F). The commencement of June brings an average high-temperature of a refreshing 15.2°C (59.4°F), marking an inconsequential divergence from May. Weather in June »Weather in July
July is an enjoyable summer month in Caernarfon, United Kingdom, with an average temperature fluctuating between 16.7°C (62.1°F) and 12.6°C (54.7°F). July is the warmest month, with an average high-temperature of 16.7°C (62.1°F) and an average low-temperature of 12.6°C (54.7°F). Weather in July »Weather in August
The last month of the summer, August, is another refreshing month in Caernarfon, United Kingdom, with temperature in the range of an average high of 16.6°C (61.9°F) and an average low of 13.2°C (55.8°F). August's climate shows a minor adjustment in average high-temperatures to a still refreshing 16.6°C (61.9°F) from July's 16.7°C (62.1°F). Weather in August »Weather in September
September, the first month of the autumn in Caernarfon, is still a refreshing month, with an average temperature fluctuating between 15.1°C (59.2°F) and 11.7°C (53.1°F). The start of September sees the average high-temperature at a mild 15.1°C (59.2°F), showing little difference from August's 16.6°C (61.9°F). Weather in September »Weather in October
October, the same as September, in Caernarfon, United Kingdom, is another mild autumn month, with an average temperature fluctuating between 13.3°C (55.9°F) and 10°C (50°F). The arrival of October records an average high-temperature of a still refreshing 13.3°C (55.9°F), closely related to the 15.1°C (59.2°F) observed in September. Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Caernarfon, United Kingdom, with an average temperature varying between 9.9°C (49.8°F) and 7.3°C (45.1°F). As October transitions into November, Caernarfon sees a gentle drop in the average high-temperature, transitioning from a mild 13.3°C (55.9°F) to a chilly 9.9°C (49.8°F). Weather in November »Weather in December
December, the first month of the winter in Caernarfon, is also a frosty month, with an average temperature fluctuating between 8.5°C (47.3°F) and 5.8°C (42.4°F). The arrival of December marks a slight shift to an average high-temperature of a still chilly 8.5°C (47.3°F) from November's 9.9°C (49.8°F). Weather in December »Updated: Feb 8, 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
In Caernarfon, during the entire year, the rain falls for 236.8 days and collects up to 754mm (29.69") of precipitation.
January through April, November and December are months with snowfall.
In Caernarfon, during the entire year, snow falls for 8.8 days and aggregates up to 58mm (2.28") of snow.
The months with the lowest UV index in Caernarfon are January through March, November and December, with an average maximum UV index of 2.
During the coldest month in Caernarfon, February, temperatures average a high of 7°C (44.6°F) and a low of 4.3°C (39.7°F).
February is the month with the most snowfall. Snow falls for 2.9 days and accumulates 19mm (0.75") of snow.
The least humid month is April, with an average relative humidity of 81%.
May is the month with the least rainfall in Caernarfon. Rain falls for 16.8 days and accumulates 37mm (1.46") of precipitation.
In Caernarfon, United Kingdom, snow does not fall in May through October.
The month with the most sunshine in Caernarfon is May, with an average of 7.9h of sunshine.
The months with the highest UV index in Caernarfon are May through September, with an average maximum UV index of 4.
June has the longest days of the year in Caernarfon, with an average of 16h and 54min of daylight.
July temperatures in Caernarfon, United Kingdom, tend to peak at an average high of 16.7°C (62.1°F) and dip to a low of 12.6°C (54.7°F).
August is the most humid month in Caernarfon, with an average relative humidity of 86%.
On Sunday, 27. October 2024, at 2:00 am, Daylight Saving Time ends in Caernarfon, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 1:00 am, and the time zone reverts from GMT to BST.
The month with the most rainfall in Caernarfon is November, when the rain falls for 22.5 days and typically aggregates up to 87mm (3.43") of precipitation.
The month with the shortest days in Caernarfon, United Kingdom, is December, with an average of 7h and 36min of daylight.
With an average of 3.4h of sunshine, December has the least sunshine of the year in Caernarfon.
Average temperature
Caernarfon, United Kingdom
The warmest month (with the highest average high temperature) is July (16.7°C).
The month with the lowest average high temperature is February (7°C).
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is February (4.3°C).
Average pressure
Caernarfon, United Kingdom
- Average pressure in January:
1012.3mbar - Average pressure in February:
1011.9mbar - Average pressure in March:
1014.5mbar - Average pressure in April:
1015mbar - Average pressure in May:
1016.2mbar - Average pressure in June:
1015.4mbar
- Average pressure in July:
1014.2mbar - Average pressure in August:
1013.3mbar - Average pressure in September:
1015.7mbar - Average pressure in October:
1013.5mbar - Average pressure in November:
1008.9mbar - Average pressure in December:
1011.9mbar
The month with the highest atmospheric pressure is May (1016.2mbar).
The month with the lowest atmospheric pressure is November (1008.9mbar).
Average wind speed
Caernarfon, United Kingdom
- Average wind speed in January:
23.8km/h - Average wind speed in February:
23.2km/h - Average wind speed in March:
19.9km/h - Average wind speed in April:
16.6km/h - Average wind speed in May:
16.8km/h - Average wind speed in June:
15.1km/h
- Average wind speed in July:
15.5km/h - Average wind speed in August:
17.7km/h - Average wind speed in September:
18.7km/h - Average wind speed in October:
20.5km/h - Average wind speed in November:
22.9km/h - Average wind speed in December:
25.3km/h
The windiest month (with the highest average wind speed) is December (25.3km/h).
The calmest month (with the lowest average wind speed) is June (15.1km/h).
Average humidity
Caernarfon, United Kingdom
The month with the highest relative humidity is August (86%).
The month with the lowest relative humidity is April (81%).
Average rainfall
Caernarfon, United Kingdom
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is May (37mm).
Average rainfall days
Caernarfon, United Kingdom
- Average rainfall days in January:
21.4 days - Average rainfall days in February:
18.1 days - Average rainfall days in March:
17.5 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
16.8 days - Average rainfall days in June:
16.9 days
- Average rainfall days in July:
20.8 days - Average rainfall days in August:
23.6 days - Average rainfall days in September:
19 days - Average rainfall days in October:
20.6 days - Average rainfall days in November:
22.5 days - Average rainfall days in December:
23.3 days
The month with the highest number of rainy days is August (23.6 days).
The month with the least rainy days is April (16.3 days).
Average snowfall
Caernarfon, United Kingdom
The month with the highest snowfall is February (19mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Caernarfon, United Kingdom
- Average snowfall days in January:
2.3 days - Average snowfall days in February:
2.9 days - Average snowfall days in March:
1.3 days - Average snowfall days in April:
0.2 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:
0.4 days - Average snowfall days in December:
1.7 days
The month with the highest number of snowfall days is February (2.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Caernarfon, United Kingdom
- 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:
3h and 36min - Average sunshine in February:
3h and 36min - Average sunshine in March:
5h and 42min - Average sunshine in April:
7h and 36min - Average sunshine in May:
7h and 54min - Average sunshine in June:
7h and 48min
- Average sunshine in July:
7h and 18min - Average sunshine in August:
7h and 6min - Average sunshine in September:
6h and 12min - Average sunshine in October:
4h and 6min - Average sunshine in November:
3h and 42min - Average sunshine in December:
3h and 24min
The month with the most sunshine is May (Average sunshine: 7h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days
Caernarfon, United Kingdom
- Average sunshine days in January:
6.1 days - Average sunshine days in February:
6.6 days - Average sunshine days in March:
10.5 days - Average sunshine days in April:
11.4 days - Average sunshine days in May:
10.9 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
7.7 days - Average sunshine days in August:
4.9 days - Average sunshine days in September:
7.7 days - Average sunshine days in October:
6.7 days - Average sunshine days in November:
5 days - Average sunshine days in December:
4.2 days
The month with the most sunshine days is April (11.4 days).
The month with the least sunshine days is December (4.2 days).
Average UV index
Caernarfon, United Kingdom
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, March, November and December (UV index 2).
Average cloud cover
Caernarfon, United Kingdom
The month with the most cloud cover is December (Cloud cover 68).
The month with the least cloud cover is May (Cloud cover 49).
Average visibility
Caernarfon, United Kingdom
The months with the highest visibility are September and October (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).
