Climate Trends in Iran

• In Iran, the longest run of hot days in a row in the data is 116 days, at Shiraz (Iran), from 20 May 1970 to 12 September 1970.
• In Iran, the longest run of days in a row at or above 40 C in the data is 112 days, at Abadan (Iran), from 4 June 2012 to 23 September 2012.
• In Iran, the longest run of frost days in a row in the data is 76 days, at Tabriz (Iran), from 13 December 1973 to 26 February 1974.
• In Iran, the longest run of ice days in a row in the data is 31 days, at Tabriz (Iran), from 13 January 1974 to 12 February 1974.
• In Iran, the longest run of dry days in a row in the data is 279 days, at Nehbandan (Iran), in 2017.
• In Iran, the longest run of wet days in a row in the data is 14 days, at Anzali (Iran), in 2011.
• In Iran, the longest run of longest run of nights at or above 25 c in the data is 45 days, at Abadan (Iran), from 7 July 1953 to 20 August 1953.

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 days at or above 40 C

Consecutive days with a daily maximum at or above 40 C (104 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).

Longest run of nights at or above 25 C

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 Iran, the largest reported one day rise in the daily maximum is 19.0 C (34.2 F), at Shiraz (Iran) on 4 May 2007.
• In Iran, the largest reported one day drop in the daily maximum is 23.0 C (41.4 F), at Mashhad (Iran) on 12 March 1969.
• In Iran, the largest reported one day rise in the daily minimum is 21.0 C (37.8 F), at Kerman (Iran) on 31 December 1963.
• In Iran, the largest reported one day drop in the daily minimum is 22.0 C (39.6 F), at Zahedan (Iran) on 19 May 2010.
• In Iran, the largest reported widest range between the high and the low of one day is 35.0 C (63.0 F), at Zahedan (Iran) on 19 May 2010.
• In Iran, the smallest reported narrowest range between the high and the low of one day is 0.0 C (0.0 F), at Kermanshah (Iran) on 27 October 2006.

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.