Climate Trends in Switzerland

• In Switzerland, annual rain at 8 stations is shown as a percent difference from each station's own 1961-1990 mean, for 75 years from 1951 to 2025.
• The trend in annual rain is -0.2 percent per decade (95 percent interval -1.6 to +1.1), fitted to 75 years from 1951 to 2025. The interval includes zero, so the series does not separate a trend from year to year variation.

Annual rain against the 1961-1990 mean

The annual rain series uses stations with at least 50 complete years since 1951 and a 1961-1990 baseline. The decade charts use fixed sets of stations, the same in every decade from the 1960s. A dry day has less than 1 mm (0.04 in) of rain.

• In Switzerland, the longest run of hot days in a row in the data is 12 days, at Basel Binningen (Switzerland), from 24 July 1947 to 4 August 1947.
• In Switzerland, the longest run of frost days in a row in the data is 239 days, at Col du Grand St-Bernard (Switzerland), from 24 September 1887 to 19 May 1888.
• In Switzerland, the longest run of ice days in a row in the data is 158 days, at Saentis (Switzerland), from 28 November 1906 to 4 May 1907.
• In Switzerland, the longest run of dry days in a row in the data is 64 days, at Sion 2 (Switzerland), in 1920.
• In Switzerland, the longest run of wet days in a row in the data is 29 days, at Col du Grand St-Bernard (Switzerland), in 1981.

Longest run of days at or above 35 C

Consecutive days with a daily maximum at or above 35 C (95 F).

Longest run of frost days (minimum at or below 0 C)

Consecutive days with a daily minimum at or below 0 C (32 F).

Longest run of ice days (maximum at or below 0 C)

Consecutive days with a daily maximum at or below 0 C (32 F).

Longest dry spell (days under 1 mm of rain), within one year

Consecutive days with less than 1 mm (0.04 in) of rain, the longest run within a year. The dates are not kept, so the list gives the year (within the year).

Longest wet spell (days with 1 mm or more of rain), within one year

Consecutive days with 1 mm (0.04 in) or more of rain, the longest run within a year. The dates are not kept, so the list gives the year (within the year).

A run belongs to the year it started in, even when it ran on into the next year. A station appears once per list, with its longest run in a complete year. Dry and wet spells are the longest run within a year. Lists use complete years only, so a long run in a year with gaps in the record is not counted.

• In Switzerland, the largest reported one day rise in the daily maximum is 15.9 C (28.6 F), at Lugano (Switzerland) on 19 January 2007.
• In Switzerland, the largest reported one day drop in the daily maximum is 21.1 C (38.0 F), at Saentis (Switzerland) on 14 February 2005.
• In Switzerland, the largest reported one day rise in the daily minimum is 19.2 C (34.6 F), at Zuerich/Fluntern (Switzerland) on 15 January 1968.
• In Switzerland, the largest reported one day drop in the daily minimum is 18.3 C (32.9 F), at Saentis (Switzerland) on 11 January 1987.
• In Switzerland, the largest reported range between the high and the low of one day is 26.1 C (47.0 F), at Saentis (Switzerland) on 13 February 2005.
• In Switzerland, the smallest reported range between the high and the low of one day is 0.0 C (0.0 F), at Saentis (Switzerland) on 18 September 1882.

Caveat.Single readings can still be instrument errors that quality control missed. A station with one faulty value can top a list, so read each entry as a reported value, not as a confirmed event.

Biggest one day rise in the daily maximum

The largest increase in the daily maximum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Biggest one day drop in the daily maximum

The largest decrease in the daily maximum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Biggest one day rise in the daily minimum

The largest increase in the daily minimum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Biggest one day drop in the daily minimum

The largest decrease in the daily minimum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.

Widest range between the high and the low of one day

The largest difference between the highest and the lowest temperature of the same day. Values are in degrees Celsius with Fahrenheit beside them.

Narrowest range between the high and the low of one day

The smallest difference between the highest and the lowest temperature of the same day. Values are in degrees Celsius with Fahrenheit beside them.

Only stations with at least 10 complete years are listed, and a station appears once per list.