nomadseason

Monthly climate in St Johnston, Ulster, Ireland

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification St Johnston features a oceanic climate (Cfb).Temperatures typically range between 5 °C (42 °F) and 15 °C (59 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 29 °C (84 °F).The average annual precipitation amounts to about 1216 mm (47.9 inches) and receives 197 rainy days on the 1 mm (0.04 inches) threshold annually.St Johnston enjoys an average of 2929 hours of sunshine throughout the year, and daylight varies from 7 hours 15 minutes to 17 hours 14 minutes per day.

Monthly average temperatures in St Johnston, Ulster, Ireland §

The warmest months in St Johnston are June, July and August, with daily mean temperatures ranging from 13 to 15 °C (56 - 59 °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, St Johnston experiences 2 days above 25 °C (77.0 °F) and 13 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in St Johnston, Ulster, Ireland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 14°C
(57°F)		 15°C
(59°F)		 17°C
(63°F)		 21°C
(70°F)		 25°C
(78°F)		 29°C
(84°F)		 28°C
(83°F)		 23°C
(74°F)		 25°C
(77°F)		 19°C
(67°F)		 15°C
(59°F)		 13°C
(55°F)
Mean maximum 12°C
(54°F)		 12°C
(54°F)		 14°C
(58°F)		 18°C
(64°F)		 22°C
(72°F)		 22°C
(71°F)		 25°C
(77°F)		 22°C
(72°F)		 21°C
(69°F)		 17°C
(63°F)		 14°C
(57°F)		 12°C
(54°F)
Average high 7°C
(46°F)		 8°C
(46°F)		 9°C
(49°F)		 12°C
(53°F)		 15°C
(59°F)		 17°C
(62°F)		 18°C
(65°F)		 17°C
(64°F)		 16°C
(61°F)		 12°C
(55°F)		 10°C
(49°F)		 8°C
(47°F)
Daily mean 5°C
(42°F)		 6°C
(42°F)		 6°C
(44°F)		 8°C
(47°F)		 11°C
(52°F)		 13°C
(56°F)		 15°C
(59°F)		 15°C
(58°F)		 13°C
(55°F)		 10°C
(50°F)		 7°C
(46°F)		 6°C
(43°F)
Average low 3°C
(39°F)		 3°C
(38°F)		 3°C
(38°F)		 5°C
(41°F)		 7°C
(46°F)		 10°C
(50°F)		 12°C
(54°F)		 12°C
(54°F)		 10°C
(50°F)		 8°C
(46°F)		 5°C
(42°F)		 4°C
(40°F)
Mean minimum -2°C
(29°F)		 -1°C
(30°F)		 -1°C
(30°F)		 0°C
(32°F)		 2°C
(36°F)		 6°C
(43°F)		 8°C
(47°F)		 8°C
(47°F)		 5°C
(42°F)		 2°C
(36°F)		 1°C
(33°F)		 -0°C
(31°F)
Minimum -4°C
(25°F)		 -3°C
(27°F)		 -4°C
(25°F)		 -1°C
(30°F)		 -0°C
(32°F)		 5°C
(40°F)		 7°C
(45°F)		 7°C
(45°F)		 3°C
(37°F)		 1°C
(33°F)		 -2°C
(28°F)		 -3°C
(28°F)

Compare climate in St Johnston with other places

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

Monthly average precipitation in St Johnston, Ulster, Ireland §

St Johnston usually has the most precipitation in February, August and October, with an average of 18 rainy days and 127 mm (5.0 inches) of precipitation per month.The driest months in St Johnston are January, April and May. On average, 76 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in St Johnston, Ulster, Ireland.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 72 (2.8) 113 (4.4) 106 (4.2) 64 (2.5) 93 (3.7) 107 (4.2) 99 (3.9) 157 (6.2) 97 (3.8) 112 (4.4) 94 (3.7) 103 (4.1)
Average precipitation days (≥ 1 mm) 13 16 17 13 16 16 15 20 16 18 18 19

Monthly sunshine hours in St Johnston, Ulster, Ireland §

The sunniest months in St Johnston are May, June and July, when the sun shines an average of 12 hours 40 minutes a day.Least sunny months in St Johnston: January, November and December receive an average of 2 hours 51 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in St Johnston, Ulster, Ireland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 69 143 198 312 398 377 389 347 277 220 114 78
Mean daily daylight hours 7h 51m 9h 41m 11h 53m 14h 9m 16h 10m 17h 14m 16h 40m 14h 50m 12h 39m 10h 24m 8h 22m 7h 15m

Solar UV radiation in St Johnston, Ulster, Ireland §

St Johnston 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 St Johnston UV Index data.

Average daily maximum UV levels by month for St Johnston, Ulster, Ireland.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 2 4 5 6 8 8 7 5 3 2 1