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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Tehran-Mehrabad Threshold Days by Year (IR000407540)

14 fixed thresholds counted per year at Tehran-Mehrabad (IR000407540): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Tehran-Mehrabad Thresholds

  • Tehran-Mehrabad: days with 10 mm (0.39 in) or more of precipitation in 21 years, most in 2005 with 10.
  • Tehran-Mehrabad: days with a maximum temperature at or above 30 C (86 F) in 13 years, most in 2008 with 146.
  • Tehran-Mehrabad: days with a maximum temperature at or above 35 C (95 F) in 13 years, most in 2006 with 84.
  • Tehran-Mehrabad: days with a maximum temperature at or above 90 F (32.2 C) in 13 years, most in 2006 with 117.
  • 14 fixed thresholds have at least one qualifying day at Tehran-Mehrabad.
13 years with a qualifying day
Days at or above 30 C (86 F) per year at Tehran-Mehrabad Days per year at Tehran-Mehrabad with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 2008. 0501001501954: 1141955: 1171958: 1272005: 1342006: 1402007: 1352008: 1462009: 1172010: 1122011: 1092012: 1152013: 1252025: 681954195820062008201020122025
Days per year at Tehran-Mehrabad with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 2008.
Days at or above 30 C (86 F) per year at Tehran-Mehrabad
YearDaysDecade average
1954114119.3
1955117119.3
1958127119.3
2005134134.4
2006140134.4
2007135134.4
2008146134.4
2009117134.4
2010112115.3
2011109115.3
2012115115.3
2013125115.3
20256868
First to last qualifying date each year at Tehran-Mehrabad For each year, a bar from the first to the last day at Tehran-Mehrabad meeting 30 C (86 F). 1954: 13 May 1954 to 29 September 19541955: 16 May 1955 to 27 September 19551958: 26 April 1958 to 7 October 19582005: 22 April 2005 to 18 October 20052006: 24 April 2006 to 12 October 20062007: 11 May 2007 to 17 October 20072008: 17 April 2008 to 15 October 20082009: 16 May 2009 to 29 September 20092010: 12 May 2010 to 18 October 20102011: 12 May 2011 to 14 October 20112012: 11 April 2012 to 12 October 20122013: 11 May 2013 to 7 October 20132025: 25 April 2025 to 24 August 20251954195820062008201020122025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Tehran-Mehrabad meeting 30 C (86 F).
First to last qualifying date each year at Tehran-Mehrabad
YearFirst dateLast date
19541954-05-131954-09-29
19551955-05-161955-09-27
19581958-04-261958-10-07
20052005-04-222005-10-18
20062006-04-242006-10-12
20072007-05-112007-10-17
20082008-04-172008-10-15
20092009-05-162009-09-29
20102010-05-122010-10-18
20112011-05-122011-10-14
20122012-04-112012-10-12
20132013-05-112013-10-07
20252025-04-252025-08-24

Every Fixed Threshold

Fixed thresholds at Tehran-Mehrabad
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days13146200868
35 C (95 F): Days1384200642
40 C (104 F): Days111420061
90 F (32.2 C): Days13117200656
100 F (37.8 C): Days1336200618
0 C (32 F): Ice days (max212200812
0 C (32 F): Frost days (min771195812
-10 C (14 F): Days with min1420084
20 C (68 F): Tropical nights (min7129200856
25 C (77 F): Days with min764200629
10 mm (0.39 in): Days with 10 mm or more rain211020051
25 mm (0.98 in): Days with 25 mm or more rain10520101
50 mm (1.97 in): Days with 50 mm or more rain4520101
100 mm (3.94 in): Days with 100 mm or more rain1120131

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1954.

Download the Data

  • 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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