Tehran-Mehrabad Weather Records (IR000407540)

Record envelope, standing records and threshold days for Tehran-Mehrabad (IR000407540), Iran, with 82 years of record.

Key Facts for Tehran-Mehrabad

Tehran-Mehrabad (IR000407540) is a weather station in Iran at 35.68 latitude and 51.32 longitude, 1,191 m (3,907 ft) above sea level.
The station reports from 1944 to 2025, 82 years of record.
1,464 records set at Tehran-Mehrabad still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Tehran-Mehrabad set a daily record precipitation of 2.3 mm (0.09 in) on 30 September 2024.

About the Station

Location: Iran, 35.68 latitude, 51.32 longitude.
Elevation: 1,191 m (3,907 ft).
Period of record: 1944 to 2025, 82 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

11 days at or beyond a record

The band shows the record high and record low for each calendar day at Tehran-Mehrabad. The lines show the 2026 daily maximum and minimum. 11 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Tehran-Mehrabad, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	21.4 C (70.5 F)	-13.0 C (8.6 F)	13.7 C (56.7 F)	-1.0 C (30.2 F)
Feb	24.4 C (75.9 F)	-10.0 C (14.0 F)	14.1 C (57.4 F)	-3.8 C (25.2 F)
Mar	30.3 C (86.5 F)	-9.0 C (15.8 F)	26.2 C (79.2 F)	-2.1 C (28.2 F)
Apr	33.0 C (91.4 F)	-2.6 C (27.3 F)	32.6 C (90.7 F)	4.7 C (40.5 F)
May	37.3 C (99.1 F)	0.0 C (32.0 F)	37.3 C (99.1 F)	14.5 C (58.1 F)
Jun	42.2 C (108.0 F)	12.4 C (54.3 F)	36.8 C (98.2 F)	15.5 C (59.9 F)
Jul	43.0 C (109.4 F)	13.9 C (57.0 F)	40.4 C (104.7 F)	15.5 C (59.9 F)
Aug	42.4 C (108.3 F)	13.9 C (57.0 F)	39.2 C (102.6 F)	23.0 C (73.4 F)
Sep	39.0 C (102.2 F)	10.6 C (51.1 F)	n/a	n/a
Oct	33.4 C (92.1 F)	2.0 C (35.6 F)	n/a	n/a
Nov	26.6 C (79.9 F)	-7.2 C (19.0 F)	n/a	n/a
Dec	21.0 C (69.8 F)	-11.5 C (11.3 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Tehran-Mehrabad still stand. 2010 holds the most, with 71.

Standing records at Tehran-Mehrabad by the year they were set
Year set	Standing records
1944	9
1954	37
1955	47
1957	47
1958	53
1966	7
1967	17
1968	27
1973	37
1974	29
1975	18
1976	23
1977	25
1978	19
1979	16
1980	15
1989	4
1990	19
1991	19
1992	37
1993	7
1994	19
1995	18
1996	6
1997	7
1998	1
1999	11
2000	25
2001	33
2002	49
2003	7
2004	11
2005	66
2006	52
2007	32
2008	68
2009	32
2010	71
2011	42
2012	19
2013	28
2014	28
2015	38
2016	33
2017	33
2018	28
2019	38
2020	26
2021	26
2022	25
2023	24
2024	31
2025	25

Wettest Day of Each Month

Mar: 104.9 mm (4.1 in)

The wettest day on record for each calendar month at Tehran-Mehrabad. The most was 104.9 mm (4.1 in) on 16 March 1992.

Record daily precipitation for each month at Tehran-Mehrabad
Month	Record daily precipitation (mm)	Date
Jan	99.1 mm (3.9 in)	3 January 1991
Feb	101.1 mm (4.0 in)	12 February 2013
Mar	104.9 mm (4.1 in)	16 March 1992
Apr	38.1 mm (1.5 in)	3 April 2002
May	19.1 mm (0.8 in)	23 May 1992
Jun	70.1 mm (2.8 in)	24 June 2010
Jul	70.1 mm (2.8 in)	15 July 2010
Aug	80.0 mm (3.1 in)	26 August 1994
Sep	16.5 mm (0.6 in)	28 September 2024
Oct	49.3 mm (1.9 in)	29 October 2011
Nov	61.0 mm (2.4 in)	21 November 2000
Dec	91.7 mm (3.6 in)	2 December 1999

Period of Record Coverage

1944 to 2025

55 years of record at Tehran-Mehrabad, 1944 to 2025. 43 years have data for under 90 percent of days and are left out of rankings: 1944, 1957, 1964, 1965, 1966, 1967, 1968, 1973 and others.

Days with data per year at Tehran-Mehrabad
Year	Days with data	Share of year	Complete
1944	37	10%	No
1954	345	95%	Yes
1955	340	93%	Yes
1957	171	47%	No
1958	352	96%	Yes
1964	3	1%	No
1965	7	2%	No
1966	80	22%	No
1967	162	44%	No
1968	244	67%	No
1973	179	49%	No
1974	155	42%	No
1975	114	31%	No
1976	173	47%	No
1977	153	42%	No
1978	215	59%	No
1979	160	44%	No
1980	162	44%	No
1989	46	13%	No
1990	79	22%	No
1991	168	46%	No
1992	212	58%	No
1993	109	30%	No
1994	95	26%	No
1995	107	29%	No
1996	58	16%	No
1997	51	14%	No
1998	8	2%	No
1999	76	21%	No
2000	216	59%	No
2001	251	69%	No
2002	291	80%	No
2003	53	15%	No
2004	177	48%	No
2005	365	100%	Yes
2006	362	99%	Yes
2007	353	97%	Yes
2008	351	96%	Yes
2009	355	97%	Yes
2010	337	92%	Yes
2011	336	92%	Yes
2012	333	91%	Yes
2013	339	93%	Yes
2014	311	85%	No
2015	313	86%	No
2016	320	87%	No
2017	309	85%	No
2018	298	82%	No
2019	299	82%	No
2020	288	79%	No
2021	280	77%	No
2022	288	79%	No
2023	293	80%	No
2024	281	77%	No
2025	161	44%	No

Latest Records

Latest records at Tehran-Mehrabad
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 September 2024	Tehran-Mehrabad, IR	daily rain	2.3 mm (0.09 in)	2.3 mm (0.09 in)	33 years	19 of 100 (Routine)
28 September 2024	Tehran-Mehrabad, IR	monthly rain	16.5 mm (0.6 in)	9.1 mm (0.36 in)	23 years	20 of 100 (Routine)
27 September 2024	Tehran-Mehrabad, IR	daily rain (Tie)	0.3 mm (0.01 in)	tie	33 years	4 of 100 (Routine)
15 September 2024	Tehran-Mehrabad, IR	daily rain	0.5 mm (0.02 in)	0.5 mm (0.02 in)	32 years	17 of 100 (Routine)
14 September 2024	Tehran-Mehrabad, IR	daily rain	4.1 mm (0.16 in)	3.6 mm (0.14 in)	26 years	18 of 100 (Routine)
3 July 2024	Tehran-Mehrabad, IR	daily rain	0.3 mm (0.01 in)	0.3 mm (0.01 in)	35 years	18 of 100 (Routine)
25 June 2024	Tehran-Mehrabad, IR	daily rain	0.3 mm (0.01 in)	0.3 mm (0.01 in)	34 years	18 of 100 (Routine)
25 May 2024	Tehran-Mehrabad, IR	daily rain	1.8 mm (0.07 in)	1.0 mm (0.04 in)	22 years	17 of 100 (Routine)
7 May 2024	Tehran-Mehrabad, IR	daily rain	8.6 mm (0.34 in)	4.8 mm (0.19 in)	3 years	20 of 100 (Routine)
3 May 2024	Tehran-Mehrabad, IR	daily rain	13.7 mm (0.5 in)	9.9 mm (0.39 in)	14 years	20 of 100 (Routine)
23 April 2024	Tehran-Mehrabad, IR	daily rain	6.4 mm (0.25 in)	5.1 mm (0.20 in)	6 years	16 of 100 (Routine)
11 April 2024	Tehran-Mehrabad, IR	daily rain	9.7 mm (0.38 in)	5.6 mm (0.22 in)	4 years	17 of 100 (Routine)
13 October 2023	Tehran-Mehrabad, IR	daily rain	0.8 mm (0.03 in)	0.5 mm (0.02 in)	10 years	11 of 100 (Routine)
12 October 2023	Tehran-Mehrabad, IR	daily rain	4.3 mm (0.17 in)	3.0 mm (0.12 in)	16 years	17 of 100 (Routine)
8 August 2023	Tehran-Mehrabad, IR	daily rain	1.5 mm (0.06 in)	1.5 mm (0.06 in)	32 years	18 of 100 (Routine)
11 June 2023	Tehran-Mehrabad, IR	daily rain (Tie)	3.3 mm (0.13 in)	tie	20 years	3 of 100 (Routine)
7 June 2023	Tehran-Mehrabad, IR	daily rain	2.0 mm (0.08 in)	2.0 mm (0.08 in)	32 years	18 of 100 (Routine)
5 June 2023	Tehran-Mehrabad, IR	daily rain	0.5 mm (0.02 in)	0.2 mm (0.01 in)	28 years	16 of 100 (Routine)
13 April 2023	Tehran-Mehrabad, IR	daily rain	7.4 mm (0.29 in)	0.5 mm (0.02 in)	6 years	10 of 100 (Routine)
22 March 2023	Tehran-Mehrabad, IR	daily rain	6.4 mm (0.25 in)	4.1 mm (0.16 in)	13 years	15 of 100 (Routine)

Extremes by Year

1944 to 2025

Yearly extremes at Tehran-Mehrabad: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.0 C (109.4 F)	1975	41.0 C (105.8 F)	55
Coldest night (TNn)	-13.0 C (8.6 F)	1973	-5.4 C (22.3 F)	54
Wettest day (Rx1day)	104.9 mm (4.1 in)	1992	25.7 mm (1.0 in)	40
Wettest five days (Rx5day)	132.1 mm (5.2 in)	1992	37.9 mm (1.5 in)	37
Longest dry spell (CDD)	143 days	2016	35 days	40

Hottest day (TXx)

The hottest day of the year at Tehran-Mehrabad, 1944 to 2025. The record is 43.0 C (109.4 F) in 1975, marked on the chart; the median year is 41.0 C (105.8 F).

Hottest day (TXx) at Tehran-Mehrabad by year
Year	Hottest day (TXx)
1944	41.1 C (106.0 F)
1954	38.9 C (102.0 F)
1955	41.7 C (107.1 F)
1957	40.0 C (104.0 F)
1958	42.2 C (108.0 F)
1964	40.0 C (104.0 F)
1965	37.2 C (99.0 F)
1966	41.1 C (106.0 F)
1967	40.0 C (104.0 F)
1968	40.0 C (104.0 F)
1973	41.0 C (105.8 F)
1974	40.0 C (104.0 F)
1975	43.0 C (109.4 F)
1976	42.0 C (107.6 F)
1977	40.0 C (104.0 F)
1978	41.0 C (105.8 F)
1979	40.0 C (104.0 F)
1980	40.0 C (104.0 F)
1989	41.5 C (106.7 F)
1990	40.6 C (105.1 F)
1991	39.5 C (103.1 F)
1992	41.0 C (105.8 F)
1993	38.6 C (101.5 F)
1994	40.2 C (104.4 F)
1995	40.8 C (105.4 F)
1996	37.8 C (100.0 F)
1997	41.2 C (106.2 F)
1998	40.6 C (105.1 F)
1999	35.4 C (95.7 F)
2000	39.4 C (102.9 F)
2001	40.8 C (105.4 F)
2002	41.0 C (105.8 F)
2003	38.6 C (101.5 F)
2004	39.4 C (102.9 F)
2005	42.0 C (107.6 F)
2006	42.0 C (107.6 F)
2007	40.0 C (104.0 F)
2008	43.0 C (109.4 F)
2009	42.0 C (107.6 F)
2010	42.2 C (108.0 F)
2011	42.2 C (108.0 F)
2012	39.6 C (103.3 F)
2013	42.6 C (108.7 F)
2014	41.2 C (106.2 F)
2015	42.2 C (108.0 F)
2016	41.2 C (106.2 F)
2017	41.2 C (106.2 F)
2018	41.4 C (106.5 F)
2019	41.6 C (106.9 F)
2020	40.6 C (105.1 F)
2021	41.6 C (106.9 F)
2022	42.0 C (107.6 F)
2023	40.5 C (104.9 F)
2024	42.4 C (108.3 F)
2025	40.4 C (104.7 F)

Coldest night (TNn)

The coldest night of the year at Tehran-Mehrabad, 1944 to 2025. The record is -13.0 C (8.6 F) in 1973, marked on the chart; the median year is -5.4 C (22.3 F).

Coldest night (TNn) at Tehran-Mehrabad by year
Year	Coldest night (TNn)
1944	-5.0 C (23.0 F)
1954	-5.6 C (21.9 F)
1955	-5.0 C (23.0 F)
1957	-6.1 C (21.0 F)
1958	-7.2 C (19.0 F)
1964	n/a
1965	-2.8 C (27.0 F)
1966	-2.2 C (28.0 F)
1967	-10.0 C (14.0 F)
1968	-8.9 C (16.0 F)
1973	-13.0 C (8.6 F)
1974	-10.0 C (14.0 F)
1975	-6.0 C (21.2 F)
1976	-8.0 C (17.6 F)
1977	-9.0 C (15.8 F)
1978	-5.0 C (23.0 F)
1979	-2.0 C (28.4 F)
1980	-9.0 C (15.8 F)
1989	-4.2 C (24.4 F)
1990	-8.4 C (16.9 F)
1991	-8.1 C (17.4 F)
1992	-7.0 C (19.4 F)
1993	-6.0 C (21.2 F)
1994	-8.6 C (16.5 F)
1995	-2.2 C (28.0 F)
1996	-3.6 C (25.5 F)
1997	-2.4 C (27.7 F)
1998	5.8 C (42.4 F)
1999	-0.2 C (31.6 F)
2000	-2.0 C (28.4 F)
2001	-1.0 C (30.2 F)
2002	-4.6 C (23.7 F)
2003	-11.5 C (11.3 F)
2004	-11.0 C (12.2 F)
2005	-7.0 C (19.4 F)
2006	-6.0 C (21.2 F)
2007	-4.0 C (24.8 F)
2008	-11.0 C (12.2 F)
2009	-4.0 C (24.8 F)
2010	-5.0 C (23.0 F)
2011	-4.8 C (23.4 F)
2012	-6.0 C (21.2 F)
2013	-5.4 C (22.3 F)
2014	-7.6 C (18.3 F)
2015	-3.4 C (25.9 F)
2016	-7.2 C (19.0 F)
2017	-5.4 C (22.3 F)
2018	-6.4 C (20.5 F)
2019	-2.8 C (27.0 F)
2020	-7.4 C (18.7 F)
2021	-3.5 C (25.7 F)
2022	-3.2 C (26.2 F)
2023	-4.1 C (24.6 F)
2024	-4.5 C (23.9 F)
2025	-3.8 C (25.2 F)

Wettest day (Rx1day)

The wettest day of the year at Tehran-Mehrabad, 1944 to 2025. The record is 104.9 mm (4.1 in) in 1992, marked on the chart; the median year is 25.7 mm (1.0 in).

Wettest day (Rx1day) at Tehran-Mehrabad by year
Year	Wettest day (Rx1day)
1944	7.1 mm (0.28 in)
1954	n/a
1955	4.1 mm (0.16 in)
1957	n/a
1958	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1973	n/a
1974	n/a
1975	n/a
1976	0.0 mm (0.00 in)
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1989	11.9 mm (0.5 in)
1990	99.1 mm (3.9 in)
1991	99.1 mm (3.9 in)
1992	104.9 mm (4.1 in)
1993	33.0 mm (1.3 in)
1994	80.0 mm (3.1 in)
1995	32.0 mm (1.3 in)
1996	55.1 mm (2.2 in)
1997	8.1 mm (0.32 in)
1998	64.0 mm (2.5 in)
1999	91.7 mm (3.6 in)
2000	61.0 mm (2.4 in)
2001	26.2 mm (1.0 in)
2002	38.1 mm (1.5 in)
2003	23.6 mm (0.9 in)
2004	52.1 mm (2.1 in)
2005	18.8 mm (0.7 in)
2006	25.1 mm (1.0 in)
2007	30.5 mm (1.2 in)
2008	13.7 mm (0.5 in)
2009	17.8 mm (0.7 in)
2010	70.1 mm (2.8 in)
2011	49.3 mm (1.9 in)
2012	23.9 mm (0.9 in)
2013	101.1 mm (4.0 in)
2014	5.1 mm (0.20 in)
2015	14.2 mm (0.6 in)
2016	28.4 mm (1.1 in)
2017	16.8 mm (0.7 in)
2018	22.6 mm (0.9 in)
2019	25.1 mm (1.0 in)
2020	55.6 mm (2.2 in)
2021	16.5 mm (0.6 in)
2022	16.5 mm (0.6 in)
2023	30.0 mm (1.2 in)
2024	16.5 mm (0.6 in)
2025	11.7 mm (0.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tehran-Mehrabad, 1944 to 2025. The record is 132.1 mm (5.2 in) in 1992, marked on the chart; the median year is 37.9 mm (1.5 in).

Wettest five days (Rx5day) at Tehran-Mehrabad by year
Year	Wettest five days (Rx5day)
1944	n/a
1954	n/a
1955	n/a
1957	n/a
1958	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1989	0.0 mm (0.00 in)
1990	29.8 mm (1.2 in)
1991	57.4 mm (2.3 in)
1992	132.1 mm (5.2 in)
1993	46.0 mm (1.8 in)
1994	80.0 mm (3.1 in)
1995	16.7 mm (0.7 in)
1996	82.3 mm (3.2 in)
1997	8.1 mm (0.32 in)
1998	64.0 mm (2.5 in)
1999	32.8 mm (1.3 in)
2000	61.3 mm (2.4 in)
2001	11.7 mm (0.5 in)
2002	48.8 mm (1.9 in)
2003	45.0 mm (1.8 in)
2004	53.1 mm (2.1 in)
2005	35.8 mm (1.4 in)
2006	33.2 mm (1.3 in)
2007	50.8 mm (2.0 in)
2008	27.9 mm (1.1 in)
2009	24.7 mm (1.0 in)
2010	70.1 mm (2.8 in)
2011	104.2 mm (4.1 in)
2012	37.9 mm (1.5 in)
2013	107.2 mm (4.2 in)
2014	10.9 mm (0.4 in)
2015	15.7 mm (0.6 in)
2016	45.9 mm (1.8 in)
2017	30.2 mm (1.2 in)
2018	36.6 mm (1.4 in)
2019	52.8 mm (2.1 in)
2020	76.2 mm (3.0 in)
2021	26.7 mm (1.1 in)
2022	26.9 mm (1.1 in)
2023	39.7 mm (1.6 in)
2024	24.6 mm (1.0 in)
2025	21.3 mm (0.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tehran-Mehrabad, 1944 to 2025. The record is 143 days in 2016, marked on the chart; the median year is 35 days.

Longest dry spell (CDD) at Tehran-Mehrabad by year
Year	Longest dry spell (CDD)
1944	1 day
1954	n/a
1955	1 day
1957	n/a
1958	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1973	n/a
1974	n/a
1975	n/a
1976	1 day
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1989	5 days
1990	8 days
1991	14 days
1992	17 days
1993	15 days
1994	11 days
1995	20 days
1996	16 days
1997	32 days
1998	22 days
1999	6 days
2000	59 days
2001	21 days
2002	36 days
2003	72 days
2004	45 days
2005	38 days
2006	41 days
2007	28 days
2008	71 days
2009	33 days
2010	88 days
2011	49 days
2012	99 days
2013	26 days
2014	20 days
2015	23 days
2016	143 days
2017	82 days
2018	105 days
2019	135 days
2020	137 days
2021	65 days
2022	93 days
2023	64 days
2024	77 days
2025	55 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

Data for Tehran-Mehrabad standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tehran-Mehrabad threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).