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Monthly climate in Grachen, Valais, Switzerland

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Grachen features a ice cap climate ET).Temperatures typically range between -10 °C (15 °F) and 13 °C (55 °F) through the year, but rarely can drop to -28 °C (-18 °F) or can rise to as high as 26 °C (78 °F).The average annual precipitation amounts to about 1426 mm (56.2 inches) and receives 174 rainy days on the 1 mm (0.04 inches) threshold annually.Grachen enjoys an average of 3659 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 42 minutes per day.

Monthly average temperatures in Grachen, Valais, Switzerland §

The warmest months in Grachen are June, July and August, with daily mean temperatures ranging from 11 to 13 °C (51 - 55 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -10 to -6 °C (15 - 22 °F) throughout the day. On average each year, Grachen experiences 0 days above 25 °C (77.0 °F) and 192 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grachen, Valais, Switzerland.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 5°C
(41°F)		 9°C
(48°F)		 12°C
(53°F)		 15°C
(59°F)		 20°C
(67°F)		 26°C
(78°F)		 25°C
(76°F)		 24°C
(76°F)		 21°C
(70°F)		 16°C
(61°F)		 12°C
(55°F)		 5°C
(42°F)
Mean maximum 0°C
(33°F)		 6°C
(43°F)		 8°C
(48°F)		 12°C
(53°F)		 16°C
(61°F)		 20°C
(69°F)		 23°C
(74°F)		 24°C
(75°F)		 19°C
(67°F)		 14°C
(57°F)		 8°C
(46°F)		 2°C
(36°F)
Average high -6°C
(22°F)		 -2°C
(29°F)		 1°C
(34°F)		 5°C
(42°F)		 9°C
(49°F)		 15°C
(60°F)		 18°C
(64°F)		 17°C
(63°F)		 13°C
(56°F)		 8°C
(47°F)		 1°C
(34°F)		 -5°C
(23°F)
Daily mean -10°C
(15°F)		 -6°C
(22°F)		 -3°C
(27°F)		 1°C
(34°F)		 5°C
(41°F)		 11°C
(51°F)		 13°C
(55°F)		 12°C
(54°F)		 8°C
(47°F)		 4°C
(39°F)		 -3°C
(27°F)		 -8°C
(17°F)
Average low -14°C
(8°F)		 -10°C
(14°F)		 -7°C
(19°F)		 -3°C
(27°F)		 0°C
(33°F)		 6°C
(43°F)		 8°C
(46°F)		 7°C
(45°F)		 4°C
(39°F)		 -0°C
(31°F)		 -6°C
(21°F)		 -12°C
(11°F)
Mean minimum -23°C
(-10°F)		 -19°C
(-2°F)		 -17°C
(1°F)		 -12°C
(11°F)		 -6°C
(22°F)		 -0°C
(32°F)		 3°C
(37°F)		 1°C
(34°F)		 -3°C
(28°F)		 -6°C
(21°F)		 -17°C
(2°F)		 -21°C
(-6°F)
Minimum -27°C
(-17°F)		 -24°C
(-10°F)		 -25°C
(-12°F)		 -17°C
(2°F)		 -13°C
(9°F)		 -3°C
(26°F)		 0°C
(33°F)		 0°C
(33°F)		 -6°C
(22°F)		 -8°C
(18°F)		 -23°C
(-10°F)		 -28°C
(-18°F)

Compare climate in Grachen with other places

Compare temperature, precipitation, sunshine, UV index in Grachen, Valais, Switzerland with other places around the world.

Monthly average precipitation in Grachen, Valais, Switzerland §

Grachen usually has the most precipitation in May, October and December, with an average of 16 rainy days and 156 mm (6.1 inches) of precipitation per month.The driest months in Grachen are February, April and September. On average, 87 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grachen, Valais, Switzerland.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) 125 (4.9) 82 (3.2) 109 (4.3) 89 (3.5) 149 (5.9) 130 (5.1) 108 (4.2) 119 (4.7) 89 (3.5) 148 (5.8) 109 (4.3) 170 (6.7)
Average precipitation days (≥ 1 mm) 11 12 15 11 20 17 16 16 13 11 15 17

Monthly sunshine hours in Grachen, Valais, Switzerland §

The sunniest months in Grachen are June, July and August, when the sun shines an average of 12 hours 53 minutes a day.Least sunny months in Grachen: January, November and December receive an average of 6 hours 37 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grachen, Valais, Switzerland.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 175 234 303 354 359 387 416 382 323 288 231 202
Mean daily daylight hours 9h 3m 10h 20m 11h 56m 13h 34m 14h 59m 15h 42m 15h 19m 14h 4m 12h 29m 10h 51m 9h 25m 8h 39m

Solar UV radiation in Grachen, Valais, Switzerland §

Grachen experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November 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 Grachen UV Index data.

Average daily maximum UV levels by month for Grachen, Valais, Switzerland.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) 3 4 7 8 10 11 10 9 7 6 3 2