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Monthly climate in Castleblayney, Ireland

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Castleblayney features a oceanic climate (Cfb). Temperatures typically range between 5 °C (42 °F) and 16 °C (61 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 29 °C (84 °F). The average annual precipitation amounts to about 957 mm (37.7 inches) and receives 166 rainy days on the 1 mm (0.04 inches) threshold annually. Castleblayney enjoys an average of 2675 hours of sunshine throughout the year, and daylight varies from 7 hours 26 minutes to 17 hours 3 minutes per day.

Monthly average temperatures in Castleblayney, Ireland

The warmest months in Castleblayney are June, July and August, with daily mean temperatures ranging from 14 to 16 °C (58 - 61 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 6 °C (42 - 43 °F) throughout the day. On average each year, Castleblayney experiences 2 days above 25 °C (77.0 °F) and 16 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Castleblayney. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(58°F)		15°C
(60°F)		17°C
(63°F)		20°C
(69°F)		24°C
(76°F)		29°C
(84°F)		28°C
(83°F)		24°C
(75°F)		23°C
(74°F)		19°C
(67°F)		15°C
(59°F)		13°C
(56°F)
Mean maximum12°C
(54°F)		13°C
(55°F)		15°C
(59°F)		18°C
(64°F)		21°C
(70°F)		22°C
(73°F)		25°C
(77°F)		22°C
(72°F)		21°C
(70°F)		17°C
(63°F)		14°C
(57°F)		12°C
(55°F)
Average high7°C
(46°F)		8°C
(47°F)		10°C
(50°F)		12°C
(53°F)		15°C
(59°F)		18°C
(64°F)		19°C
(67°F)		18°C
(65°F)		16°C
(62°F)		13°C
(55°F)		10°C
(50°F)		8°C
(47°F)
Daily mean5°C
(42°F)		6°C
(43°F)		7°C
(44°F)		8°C
(47°F)		11°C
(53°F)		14°C
(58°F)		16°C
(61°F)		15°C
(59°F)		13°C
(56°F)		10°C
(51°F)		7°C
(46°F)		6°C
(43°F)
Average low3°C
(38°F)		3°C
(38°F)		3°C
(39°F)		5°C
(41°F)		7°C
(46°F)		10°C
(51°F)		12°C
(54°F)		12°C
(54°F)		10°C
(50°F)		8°C
(46°F)		5°C
(41°F)		4°C
(39°F)
Mean minimum-3°C
(28°F)		-2°C
(29°F)		-1°C
(30°F)		-1°C
(31°F)		1°C
(34°F)		5°C
(42°F)		8°C
(47°F)		8°C
(46°F)		5°C
(41°F)		2°C
(36°F)		-0°C
(32°F)		-1°C
(31°F)
Minimum-4°C
(25°F)		-5°C
(24°F)		-4°C
(25°F)		-3°C
(27°F)		-1°C
(30°F)		4°C
(40°F)		7°C
(44°F)		6°C
(43°F)		2°C
(36°F)		-1°C
(31°F)		-3°C
(27°F)		-3°C
(26°F)

Compare climate in Castleblayney with other places

Compare temperature, precipitation, sunshine, UV index in Castleblayney, Ireland with other places around the world.

Monthly average precipitation in Castleblayney, Ireland

Castleblayney usually has the most precipitation in February, August and December, with an average of 15 rainy days and 100 mm (3.9 inches) of precipitation per month. The driest months in Castleblayney are January, April and May. On average, 59 mm (2.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Castleblayney. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)57 (2.3)90 (3.5)83 (3.3)49 (1.9)70 (2.8)81 (3.2)78 (3.1)120 (4.7)75 (3.0)81 (3.2)83 (3.3)90 (3.6)
Average precipitation days (≥ 1 mm)101517111215131912141513

Monthly sunshine hours in Castleblayney, Ireland

The sunniest months in Castleblayney are May, June and July, when the sun shines an average of 11 hours 33 minutes a day. Least sunny months in Castleblayney: January, November and December receive an average of 2 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Castleblayney. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours7413517027936135134929526221010479
Mean daily daylight hours8h 0m9h 45m11h 54m14h 5m16h 1m17h 3m16h 30m14h 45m12h 38m10h 28m8h 29m7h 26m

Solar UV radiation in Castleblayney, Ireland

Castleblayney experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure. January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Castleblayney UV Index data.

Average daily maximum UV levels by month for Castleblayney. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)124578875321