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Monthly climate in Dumbarton, Scotland, United Kingdom

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Dumbarton features a oceanic climate (Cfb).Temperatures typically range between 4 °C (40 °F) and 15 °C (59 °F) through the year, but rarely can drop to -10 °C (14 °F) or can rise to as high as 28 °C (83 °F).The average annual precipitation amounts to about 1431 mm (56.3 inches) and receives 199 rainy days on the 1 mm (0.04 inches) threshold annually.Dumbarton enjoys an average of 2794 hours of sunshine throughout the year, and daylight varies from 7 hours 3 minutes to 17 hours 28 minutes per day.

Monthly average temperatures in Dumbarton, Scotland, United Kingdom §

The warmest months in Dumbarton are June, July and August, with daily mean temperatures ranging from 14 to 15 °C (57 - 59 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 5 °C (40 - 41 °F) throughout the day. On average each year, Dumbarton experiences 0 days above 25 °C (77.0 °F) and 37 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Dumbarton, Scotland, United Kingdom.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 13°C
(56°F)		 13°C
(56°F)		 16°C
(62°F)		 22°C
(72°F)		 25°C
(77°F)		 28°C
(83°F)		 27°C
(81°F)		 25°C
(77°F)		 25°C
(77°F)		 19°C
(67°F)		 14°C
(58°F)		 12°C
(55°F)
Mean maximum 11°C
(52°F)		 11°C
(53°F)		 13°C
(56°F)		 17°C
(63°F)		 21°C
(71°F)		 22°C
(71°F)		 23°C
(75°F)		 22°C
(73°F)		 20°C
(69°F)		 16°C
(61°F)		 13°C
(56°F)		 12°C
(53°F)
Average high 6°C
(44°F)		 7°C
(45°F)		 9°C
(48°F)		 11°C
(52°F)		 14°C
(58°F)		 17°C
(63°F)		 18°C
(65°F)		 17°C
(64°F)		 15°C
(60°F)		 12°C
(54°F)		 9°C
(48°F)		 7°C
(45°F)
Daily mean 4°C
(40°F)		 5°C
(41°F)		 6°C
(42°F)		 7°C
(46°F)		 11°C
(51°F)		 14°C
(57°F)		 15°C
(59°F)		 14°C
(58°F)		 12°C
(55°F)		 10°C
(50°F)		 7°C
(44°F)		 5°C
(41°F)
Average low 2°C
(36°F)		 2°C
(36°F)		 3°C
(37°F)		 4°C
(39°F)		 7°C
(44°F)		 10°C
(50°F)		 12°C
(53°F)		 11°C
(53°F)		 9°C
(49°F)		 7°C
(45°F)		 4°C
(40°F)		 3°C
(37°F)
Mean minimum -4°C
(25°F)		 -4°C
(25°F)		 -3°C
(27°F)		 -2°C
(28°F)		 1°C
(34°F)		 6°C
(42°F)		 7°C
(46°F)		 7°C
(45°F)		 3°C
(38°F)		 -0°C
(32°F)		 -1°C
(30°F)		 -3°C
(26°F)
Minimum -6°C
(21°F)		 -10°C
(14°F)		 -6°C
(22°F)		 -4°C
(24°F)		 -1°C
(30°F)		 4°C
(39°F)		 7°C
(44°F)		 6°C
(43°F)		 -3°C
(27°F)		 -2°C
(29°F)		 -3°C
(26°F)		 -5°C
(22°F)

Compare climate in Dumbarton with other places

Compare temperature, precipitation, sunshine, UV index in Dumbarton, Scotland, United Kingdom with other places around the world.

Monthly average precipitation in Dumbarton, Scotland, United Kingdom §

Dumbarton usually has the most precipitation in February, August and October, with an average of 19 rainy days and 159 mm (6.3 inches) of precipitation per month.The driest months in Dumbarton are January, April and May. On average, 75 mm (2.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Dumbarton, Scotland, United Kingdom.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) 99 (3.9) 166 (6.5) 127 (5.0) 50 (2.0) 75 (3.0) 118 (4.6) 103 (4.1) 145 (5.7) 108 (4.2) 166 (6.5) 134 (5.3) 139 (5.5)
Average precipitation days (≥ 1 mm) 13 19 18 12 14 18 15 19 16 19 18 18

Monthly sunshine hours in Dumbarton, Scotland, United Kingdom §

The sunniest months in Dumbarton are May, June and July, when the sun shines an average of 12 hours 27 minutes a day.Least sunny months in Dumbarton: January, November and December receive an average of 2 hours 33 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Dumbarton, Scotland, United Kingdom.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 66 120 171 317 387 377 382 337 269 194 103 65
Mean daily daylight hours 7h 41m 9h 36m 11h 53m 14h 14m 16h 20m 17h 28m 16h 51m 14h 57m 12h 40m 10h 21m 8h 13m 7h 3m

Solar UV radiation in Dumbarton, Scotland, United Kingdom §

Dumbarton experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 6 - 8, which corresponds to the High / Very High category of sun exposure.January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Dumbarton UV Index data.

Average daily maximum UV levels by month for Dumbarton, Scotland, United Kingdom.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 3 5 6 8 8 6 5 3 1 1