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Built 2026-10-19 (19 October 2026)

Iron Mtn Threshold Days by Year (USC00044297)

15 fixed thresholds counted per year at Iron Mtn (USC00044297): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iron Mtn Thresholds

  • Iron Mtn: days with a maximum temperature at or above 30 C (86 F) in 85 years, most in 2007 with 212.
  • Iron Mtn: days with a maximum temperature at or above 35 C (95 F) in 85 years, most in 2001 with 165.
  • Iron Mtn: days with a maximum temperature at or above 40 C (104 F) in 85 years, most in 2001 with 118.
  • Iron Mtn: days with a maximum temperature at or above 45 C (113 F) in 85 years, most in 2007 with 39.
  • 15 fixed thresholds have at least one qualifying day at Iron Mtn.
85 years with a qualifying day
Days at or above 30 C (86 F) per year at Iron Mtn Days per year at Iron Mtn with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 212 in 2007. 01002003001935: 1751936: 2011937: 1961938: 1671939: 1911940: 1931941: 1611942: 1831943: 1881944: 1791945: 1881946: 1771947: 1861948: 1751949: 1831950: 2031951: 1781952: 1921953: 1791954: 2001955: 1811956: 1921957: 1701958: 1901959: 1941960: 1931961: 1801962: 2021963: 1811964: 1821965: 1781966: 2011967: 1821968: 1911969: 1791970: 1741971: 1581972: 1981973: 1891974: 1911975: 1731976: 1791977: 1801978: 1821979: 1851980: 1801981: 1951983: 1681984: 1801985: 1811986: 1921987: 1941988: 2051989: 1911990: 2041991: 1801992: 1921993: 1921994: 1841995: 1991996: 2051997: 2091998: 1762000: 1832001: 2072002: 1942004: 2062005: 1902006: 1892007: 2122008: 1982009: 1762010: 1752011: 1702012: 1952013: 1822015: 2002019: 1722020: 1912021: 1882022: 1752023: 1672024: 1922025: 2082026: 881935194419531962197119801990200020102023
Days per year at Iron Mtn with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 212 in 2007.
Days at or above 30 C (86 F) per year at Iron Mtn
YearDaysDecade average
1935175186
1936201186
1937196186
1938167186
1939191186
1940193181.3
1941161181.3
1942183181.3
1943188181.3
1944179181.3
1945188181.3
1946177181.3
1947186181.3
1948175181.3
1949183181.3
1950203187.9
1951178187.9
1952192187.9
1953179187.9
1954200187.9
1955181187.9
1956192187.9
1957170187.9
1958190187.9
1959194187.9
1960193186.9
1961180186.9
1962202186.9
1963181186.9
1964182186.9
1965178186.9
1966201186.9
1967182186.9
1968191186.9
1969179186.9
1970174180.9
1971158180.9
1972198180.9
1973189180.9
1974191180.9
1975173180.9
1976179180.9
1977180180.9
1978182180.9
1979185180.9
1980180187.3
1981195187.3
1983168187.3
1984180187.3
1985181187.3
1986192187.3
1987194187.3
1988205187.3
1989191187.3
1990204193.4
1991180193.4
1992192193.4
1993192193.4
1994184193.4
1995199193.4
1996205193.4
1997209193.4
1998176193.4
2000183195
2001207195
2002194195
2004206195
2005190195
2006189195
2007212195
2008198195
2009176195
2010175182.3
2011170182.3
2012195182.3
2013182182.3
2015200182.3
2019172182.3
2020191172.7
2021188172.7
2022175172.7
2023167172.7
2024192172.7
2025208172.7
202688172.7
First to last qualifying date each year at Iron Mtn For each year, a bar from the first to the last day at Iron Mtn meeting 30 C (86 F). 1935: 14 March 1935 to 28 October 19351936: 8 March 1936 to 15 November 19361937: 9 March 1937 to 5 November 19371938: 4 April 1938 to 30 October 19381939: 16 March 1939 to 5 November 19391940: 21 March 1940 to 25 October 19401941: 24 April 1941 to 6 November 19411942: 29 March 1942 to 15 November 19421943: 27 March 1943 to 28 October 19431944: 2 April 1944 to 31 October 19441945: 1 April 1945 to 6 November 19451946: 11 March 1946 to 27 October 19461947: 16 March 1947 to 2 November 19471948: 9 April 1948 to 26 October 19481949: 11 April 1949 to 19 November 19491950: 6 March 1950 to 9 November 19501951: 16 March 1951 to 21 October 19511952: 2 April 1952 to 1 November 19521953: 24 March 1953 to 14 November 19531954: 25 February 1954 to 31 October 19541955: 10 March 1955 to 11 November 19551956: 19 March 1956 to 12 November 19561957: 14 February 1957 to 20 October 19571958: 15 April 1958 to 10 November 19581959: 14 March 1959 to 29 October 19591960: 13 March 1960 to 2 November 19601961: 15 March 1961 to 26 October 19611962: 27 March 1962 to 13 November 19621963: 8 February 1963 to 13 November 19631964: 29 March 1964 to 30 October 19641965: 18 April 1965 to 8 November 19651966: 15 March 1966 to 4 November 19661967: 3 March 1967 to 16 November 19671968: 24 February 1968 to 30 October 19681969: 28 March 1969 to 29 October 19691970: 24 March 1970 to 21 October 19701971: 24 March 1971 to 23 October 19711972: 28 February 1972 to 9 October 19721973: 7 April 1973 to 13 November 19731974: 15 March 1974 to 22 October 19741975: 1 March 1975 to 6 November 19751976: 19 March 1976 to 5 November 19761977: 19 February 1977 to 28 October 19771978: 18 March 1978 to 10 November 19781979: 9 March 1979 to 29 October 19791980: 10 April 1980 to 11 November 19801981: 19 February 1981 to 6 November 19811983: 31 March 1983 to 6 November 19831984: 21 March 1984 to 6 November 19841985: 25 March 1985 to 4 November 19851986: 25 February 1986 to 30 October 19861987: 13 March 1987 to 27 October 19871988: 21 March 1988 to 8 November 19881989: 24 February 1989 to 13 November 19891990: 19 March 1990 to 15 November 19901991: 4 April 1991 to 9 November 19911992: 5 April 1992 to 24 October 19921993: 18 March 1993 to 29 October 19931994: 4 March 1994 to 2 November 19941995: 15 March 1995 to 19 November 19951996: 9 February 1996 to 13 November 19961997: 11 March 1997 to 8 November 19971998: 23 March 1998 to 25 October 19982000: 15 March 2000 to 22 October 20002001: 20 March 2001 to 7 November 20012002: 13 March 2002 to 22 November 20022004: 9 March 2004 to 17 October 20042005: 10 March 2005 to 4 November 20052006: 26 March 2006 to 9 November 20062007: 10 March 2007 to 20 November 20072008: 12 March 2008 to 19 November 20082009: 18 March 2009 to 11 November 20092010: 19 March 2010 to 7 November 20102011: 12 March 2011 to 1 November 20112012: 15 March 2012 to 7 November 20122013: 12 March 2013 to 27 October 20132015: 10 March 2015 to 10 November 20152019: 3 April 2019 to 10 November 20192020: 2 April 2020 to 21 November 20202021: 30 March 2021 to 26 November 20212022: 3 March 2022 to 22 October 20222023: 10 April 2023 to 7 November 20232024: 12 March 2024 to 29 October 20242025: 25 February 2025 to 14 November 20252026: 26 February 2026 to 12 October 202619351946195719681979199120042019JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Iron Mtn meeting 30 C (86 F).
First to last qualifying date each year at Iron Mtn
YearFirst dateLast date
19351935-03-141935-10-28
19361936-03-081936-11-15
19371937-03-091937-11-05
19381938-04-041938-10-30
19391939-03-161939-11-05
19401940-03-211940-10-25
19411941-04-241941-11-06
19421942-03-291942-11-15
19431943-03-271943-10-28
19441944-04-021944-10-31
19451945-04-011945-11-06
19461946-03-111946-10-27
19471947-03-161947-11-02
19481948-04-091948-10-26
19491949-04-111949-11-19
19501950-03-061950-11-09
19511951-03-161951-10-21
19521952-04-021952-11-01
19531953-03-241953-11-14
19541954-02-251954-10-31
19551955-03-101955-11-11
19561956-03-191956-11-12
19571957-02-141957-10-20
19581958-04-151958-11-10
19591959-03-141959-10-29
19601960-03-131960-11-02
19611961-03-151961-10-26
19621962-03-271962-11-13
19631963-02-081963-11-13
19641964-03-291964-10-30
19651965-04-181965-11-08
19661966-03-151966-11-04
19671967-03-031967-11-16
19681968-02-241968-10-30
19691969-03-281969-10-29
19701970-03-241970-10-21
19711971-03-241971-10-23
19721972-02-281972-10-09
19731973-04-071973-11-13
19741974-03-151974-10-22
19751975-03-011975-11-06
19761976-03-191976-11-05
19771977-02-191977-10-28
19781978-03-181978-11-10
19791979-03-091979-10-29
19801980-04-101980-11-11
19811981-02-191981-11-06
19831983-03-311983-11-06
19841984-03-211984-11-06
19851985-03-251985-11-04
19861986-02-251986-10-30
19871987-03-131987-10-27
19881988-03-211988-11-08
19891989-02-241989-11-13
19901990-03-191990-11-15
19911991-04-041991-11-09
19921992-04-051992-10-24
19931993-03-181993-10-29
19941994-03-041994-11-02
19951995-03-151995-11-19
19961996-02-091996-11-13
19971997-03-111997-11-08
19981998-03-231998-10-25
20002000-03-152000-10-22
20012001-03-202001-11-07
20022002-03-132002-11-22
20042004-03-092004-10-17
20052005-03-102005-11-04
20062006-03-262006-11-09
20072007-03-102007-11-20
20082008-03-122008-11-19
20092009-03-182009-11-11
20102010-03-192010-11-07
20112011-03-122011-11-01
20122012-03-152012-11-07
20132013-03-122013-10-27
20152015-03-102015-11-10
20192019-04-032019-11-10
20202020-04-022020-11-21
20212021-03-302021-11-26
20222022-03-032022-10-22
20232023-04-102023-11-07
20242024-03-122024-10-29
20252025-02-252025-11-14
20262026-02-262026-10-12

Every Fixed Threshold

Fixed thresholds at Iron Mtn
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days85212200788
35 C (95 F): Days85165200172
40 C (104 F): Days85118200134
45 C (113 F): Days853920071
50 C (122 F): Days5220081
90 F (32.2 C): Days85190200183
100 F (37.8 C): Days85141200163
110 F (43.3 C): Days857620249
120 F (48.9 C): Days20420053
0 C (32 F): Frost days (min502119492
20 C (68 F): Tropical nights (min84161202074
25 C (77 F): Days with min84113202439
10 mm (0.39 in): Days with 10 mm or more rain79819411
25 mm (0.98 in): Days with 25 mm or more rain31219391
50 mm (1.97 in): Days with 50 mm or more rain3219391

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.

Download the Data

  • Data for Iron Mtn 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 (2026-10-17).