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

Semnan Threshold Days by Year (IRM00040757)

14 fixed thresholds counted per year at Semnan (IRM00040757): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Semnan Thresholds

  • Semnan: days with 10 mm (0.39 in) or more of precipitation in 17 years, most in 2011 with 5.
  • Semnan: days with a maximum temperature at or above 30 C (86 F) in 16 years, most in 2021 with 151.
  • Semnan: days with a maximum temperature at or above 35 C (95 F) in 16 years, most in 2021 with 117.
  • Semnan: days with a maximum temperature at or above 40 C (104 F) in 16 years, most in 2018 with 27.
  • 14 fixed thresholds have at least one qualifying day at Semnan.
16 years with a qualifying day
Days at or above 30 C (86 F) per year at Semnan Days per year at Semnan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 151 in 2021. 0501001502002007: 1272008: 1502011: 1452012: 1432013: 1322014: 1452015: 1462016: 1432017: 1332018: 1322019: 1322020: 1262021: 1512022: 1472023: 1382025: 920072011201320152017201920212023
Days per year at Semnan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 151 in 2021.
Days at or above 30 C (86 F) per year at Semnan
YearDaysDecade average
2007127138.5
2008150138.5
2011145139
2012143139
2013132139
2014145139
2015146139
2016143139
2017133139
2018132139
2019132139
2020126114.2
2021151114.2
2022147114.2
2023138114.2
20259114.2
First to last qualifying date each year at Semnan For each year, a bar from the first to the last day at Semnan meeting 30 C (86 F). 2007: 1 May 2007 to 17 October 20072008: 27 March 2008 to 17 October 20082011: 20 April 2011 to 19 October 20112012: 11 April 2012 to 12 October 20122013: 8 May 2013 to 20 October 20132014: 27 April 2014 to 6 October 20142015: 10 April 2015 to 8 October 20152016: 25 April 2016 to 28 September 20162017: 23 April 2017 to 11 October 20172018: 28 March 2018 to 5 October 20182019: 4 May 2019 to 9 October 20192020: 6 May 2020 to 3 October 20202021: 19 April 2021 to 1 October 20212022: 4 April 2022 to 16 October 20222023: 21 April 2023 to 10 October 20232025: 20 May 2025 to 8 August 202520072011201320152017201920212023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Semnan meeting 30 C (86 F).
First to last qualifying date each year at Semnan
YearFirst dateLast date
20072007-05-012007-10-17
20082008-03-272008-10-17
20112011-04-202011-10-19
20122012-04-112012-10-12
20132013-05-082013-10-20
20142014-04-272014-10-06
20152015-04-102015-10-08
20162016-04-252016-09-28
20172017-04-232017-10-11
20182018-03-282018-10-05
20192019-05-042019-10-09
20202020-05-062020-10-03
20212021-04-192021-10-01
20222022-04-042022-10-16
20232023-04-212023-10-10
20252025-05-202025-08-08

Every Fixed Threshold

Fixed thresholds at Semnan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1615120219
35 C (95 F): Days1611720219
40 C (104 F): Days162720187
90 F (32.2 C): Days1613520219
100 F (37.8 C): Days166020189
110 F (43.3 C): Days1320213
0 C (32 F): Ice days (max3420082
0 C (32 F): Frost days (min10n/a7
20 C (68 F): Tropical nights (min10n/a11
25 C (77 F): Days with min10n/a8
10 mm (0.39 in): Days with 10 mm or more rain17520112
25 mm (0.98 in): Days with 25 mm or more rain8120071
50 mm (1.97 in): Days with 50 mm or more rain10n/a1
100 mm (3.94 in): Days with 100 mm or more rain10n/a1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2007.

Download the Data

  • Data for Semnan 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).