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Monthly climate in Trelly, France

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Trelly features a oceanic climate (Cfb). Temperatures typically range between 7 °C (45 °F) and 18 °C (65 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 34 °C (93 °F). The average annual precipitation amounts to about 1146 mm (45.1 inches) and receives 173 rainy days on the 1 mm (0.04 inches) threshold annually. Trelly enjoys an average of 3600 hours of sunshine throughout the year, and daylight varies from 8 hours 16 minutes to 16 hours 7 minutes per day.

Monthly average temperatures in Trelly, France

The warmest months in Trelly are July, August and September, with daily mean temperatures ranging from 17 to 18 °C (62 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 9 °C (45 - 48 °F) throughout the day. On average each year, Trelly experiences 5 days above 25 °C (77.0 °F) and 2 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Trelly. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum14°C
(58°F)		17°C
(62°F)		19°C
(67°F)		22°C
(72°F)		25°C
(77°F)		30°C
(86°F)		34°C
(93°F)		32°C
(89°F)		28°C
(82°F)		22°C
(72°F)		17°C
(63°F)		14°C
(57°F)
Mean maximum12°C
(54°F)		13°C
(56°F)		16°C
(61°F)		20°C
(67°F)		21°C
(71°F)		24°C
(76°F)		28°C
(83°F)		27°C
(80°F)		25°C
(76°F)		20°C
(68°F)		16°C
(61°F)		13°C
(56°F)
Average high8°C
(48°F)		9°C
(49°F)		11°C
(52°F)		13°C
(56°F)		16°C
(60°F)		19°C
(66°F)		21°C
(69°F)		20°C
(68°F)		19°C
(66°F)		16°C
(61°F)		12°C
(54°F)		10°C
(50°F)
Daily mean7°C
(45°F)		8°C
(46°F)		9°C
(48°F)		11°C
(51°F)		13°C
(56°F)		16°C
(62°F)		18°C
(65°F)		18°C
(65°F)		17°C
(62°F)		14°C
(57°F)		10°C
(51°F)		9°C
(48°F)
Average low6°C
(42°F)		6°C
(43°F)		7°C
(45°F)		8°C
(47°F)		11°C
(52°F)		14°C
(58°F)		16°C
(61°F)		16°C
(61°F)		15°C
(59°F)		12°C
(54°F)		9°C
(48°F)		7°C
(45°F)
Mean minimum2°C
(35°F)		1°C
(33°F)		2°C
(36°F)		4°C
(39°F)		7°C
(45°F)		11°C
(53°F)		14°C
(57°F)		13°C
(56°F)		11°C
(52°F)		8°C
(47°F)		5°C
(40°F)		2°C
(36°F)
Minimum-2°C
(29°F)		-3°C
(27°F)		-4°C
(25°F)		2°C
(37°F)		5°C
(41°F)		11°C
(51°F)		13°C
(55°F)		13°C
(55°F)		9°C
(49°F)		7°C
(44°F)		3°C
(37°F)		0°C
(33°F)

Compare climate in Trelly with other places

Compare temperature, precipitation, sunshine, UV index in Trelly, France with other places around the world.

Monthly average precipitation in Trelly, France

Trelly usually has the most precipitation in October, November and December, with an average of 18 rainy days and 146 mm (5.7 inches) of precipitation per month. The driest months in Trelly are April, July and August. On average, 60 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Trelly. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)96 (3.8)93 (3.7)91 (3.6)42 (1.7)82 (3.2)81 (3.2)62 (2.4)77 (3.1)85 (3.3)146 (5.7)115 (4.5)176 (6.9)
Average precipitation days (≥ 1 mm)15141791213111513171720

Monthly sunshine hours in Trelly, France

The sunniest months in Trelly are May, June and July, when the sun shines an average of 13 hours 29 minutes a day. Least sunny months in Trelly: January, February and December receive an average of 5 hours 42 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Trelly. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours137200281354409404426388329266220180
Mean daily daylight hours8h 43m10h 9m11h 55m13h 44m15h 19m16h 7m15h 41m14h 17m12h 32m10h 44m9h 7m8h 16m

Solar UV radiation in Trelly, France

Trelly experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the 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 2. For more detailed information, check out our hourly Trelly UV Index data.

Average daily maximum UV levels by month for Trelly. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)234679886421