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Monthly climate in Riom, France

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Riom features a oceanic climate (Cfb). Temperatures typically range between 3 °C (38 °F) and 20 °C (69 °F) through the year, but rarely can drop to -14 °C (7 °F) or can rise to as high as 38 °C (101 °F). The average annual precipitation amounts to about 874 mm (34.4 inches) and receives 147 rainy days on the 1 mm (0.04 inches) threshold annually. Riom enjoys an average of 3472 hours of sunshine throughout the year, and daylight varies from 8 hours 42 minutes to 15 hours 39 minutes per day.

Monthly average temperatures in Riom, France

The warmest months in Riom are June, July and August, with daily mean temperatures ranging from 18 to 20 °C (65 - 69 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 3 to 6 °C (38 - 42 °F) throughout the day. On average each year, Riom experiences 52 days above 25 °C (77.0 °F) and 55 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Riom. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(62°F)		22°C
(72°F)		24°C
(75°F)		27°C
(81°F)		30°C
(87°F)		38°C
(100°F)		38°C
(101°F)		37°C
(99°F)		34°C
(93°F)		28°C
(82°F)		21°C
(70°F)		16°C
(62°F)
Mean maximum13°C
(56°F)		18°C
(65°F)		21°C
(70°F)		24°C
(76°F)		27°C
(81°F)		31°C
(88°F)		34°C
(94°F)		35°C
(94°F)		31°C
(87°F)		25°C
(78°F)		19°C
(66°F)		15°C
(59°F)
Average high6°C
(43°F)		10°C
(51°F)		13°C
(55°F)		16°C
(61°F)		19°C
(66°F)		24°C
(75°F)		26°C
(79°F)		26°C
(79°F)		22°C
(73°F)		17°C
(63°F)		11°C
(52°F)		8°C
(46°F)
Daily mean3°C
(38°F)		6°C
(42°F)		7°C
(46°F)		10°C
(51°F)		14°C
(57°F)		18°C
(65°F)		20°C
(69°F)		20°C
(68°F)		16°C
(61°F)		12°C
(54°F)		7°C
(44°F)		5°C
(41°F)
Average low0°C
(32°F)		2°C
(35°F)		2°C
(37°F)		4°C
(40°F)		8°C
(47°F)		12°C
(55°F)		14°C
(57°F)		14°C
(57°F)		10°C
(51°F)		8°C
(46°F)		3°C
(38°F)		2°C
(36°F)
Mean minimum-6°C
(22°F)		-5°C
(23°F)		-5°C
(23°F)		-4°C
(26°F)		1°C
(34°F)		7°C
(45°F)		9°C
(49°F)		7°C
(46°F)		4°C
(40°F)		1°C
(34°F)		-2°C
(28°F)		-4°C
(25°F)
Minimum-11°C
(13°F)		-11°C
(12°F)		-14°C
(7°F)		-5°C
(23°F)		-1°C
(30°F)		6°C
(43°F)		7°C
(45°F)		6°C
(43°F)		3°C
(37°F)		0°C
(32°F)		-3°C
(26°F)		-5°C
(23°F)

Compare climate in Riom with other places

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

Monthly average precipitation in Riom, France

Riom usually has the most precipitation in May, June and December, with an average of 15 rainy days and 98 mm (3.8 inches) of precipitation per month. The driest months in Riom are February, April and August. On average, 56 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Riom. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)62 (2.5)53 (2.1)69 (2.7)51 (2.0)96 (3.8)99 (3.9)81 (3.2)62 (2.4)64 (2.5)67 (2.6)71 (2.8)98 (3.9)
Average precipitation days (≥ 1 mm)1312149161310109111317

Monthly sunshine hours in Riom, France

The sunniest months in Riom are June, July and August, when the sun shines an average of 13 hours 2 minutes a day. Least sunny months in Riom: January, November and December receive an average of 5 hours 26 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Riom. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours131209276340369401409389320255206163
Mean daily daylight hours9h 6m10h 21m11h 56m13h 33m14h 57m15h 39m15h 17m14h 2m12h 29m10h 52m9h 27m8h 42m

Solar UV radiation in Riom, France

Riom experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Riom UV Index data.

Average daily maximum UV levels by month for Riom. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)23678101097532