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Built 2026-10-19 (19 October 2026)

Imperial Muni AP Threshold Days by Year (USW00024091)

17 fixed thresholds counted per year at Imperial Muni AP (USW00024091): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Imperial Muni AP Thresholds

  • Imperial Muni AP: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1965 with 23.
  • Imperial Muni AP: days with a maximum temperature at or above 30 C (86 F) in 46 years, most in 2022 with 104.
  • Imperial Muni AP: days with a maximum temperature at or above 35 C (95 F) in 46 years, most in 2012 with 60.
  • Imperial Muni AP: days with a maximum temperature at or above 90 F (32.2 C) in 46 years, most in 2012 with 78.
  • 17 fixed thresholds have at least one qualifying day at Imperial Muni AP.
46 years with a qualifying day
Days at or above 30 C (86 F) per year at Imperial Muni AP Days per year at Imperial Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 104 in 2022. 0501001501952: 861953: 921954: 891955: 891956: 951957: 651958: 571959: 831960: 751961: 651962: 571963: 941964: 811965: 471966: 741967: 551968: 821969: 641970: 851971: 692001: 922002: 832003: 822004: 712005: 852006: 852007: 842008: 602009: 562010: 892011: 762012: 1022013: 842014: 702015: 822016: 712017: 882018: 812019: 762020: 982021: 952022: 1042023: 762024: 952025: 822026: 1081952195719621967200120062011201620212026
Days per year at Imperial Muni AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 104 in 2022.
Days at or above 30 C (86 F) per year at Imperial Muni AP
YearDaysDecade average
19528682
19539282
19548982
19558982
19569582
19576582
19585782
19598382
19607569.4
19616569.4
19625769.4
19639469.4
19648169.4
19654769.4
19667469.4
19675569.4
19688269.4
19696469.4
19708577
19716977
20019277.6
20028377.6
20038277.6
20047177.6
20058577.6
20068577.6
20078477.6
20086077.6
20095677.6
20108981.9
20117681.9
201210281.9
20138481.9
20147081.9
20158281.9
20167181.9
20178881.9
20188181.9
20197681.9
20209894
20219594
202210494
20237694
20249594
20258294
202610894
First to last qualifying date each year at Imperial Muni AP For each year, a bar from the first to the last day at Imperial Muni AP meeting 30 C (86 F). 1952: 4 May 1952 to 30 September 19521953: 27 April 1953 to 12 October 19531954: 6 April 1954 to 8 October 19541955: 26 April 1955 to 19 October 19551956: 8 May 1956 to 12 October 19561957: 4 June 1957 to 30 September 19571958: 21 May 1958 to 18 October 19581959: 6 April 1959 to 25 October 19591960: 21 April 1960 to 7 October 19601961: 28 May 1961 to 5 October 19611962: 19 April 1962 to 14 October 19621963: 28 March 1963 to 5 October 19631964: 16 April 1964 to 16 October 19641965: 22 April 1965 to 9 October 19651966: 4 May 1966 to 8 October 19661967: 29 March 1967 to 12 October 19671968: 30 March 1968 to 29 October 19681969: 25 May 1969 to 2 October 19691970: 7 May 1970 to 5 October 19701971: 11 June 1971 to 10 October 19712001: 19 April 2001 to 2 October 20012002: 15 April 2002 to 16 September 20022003: 14 April 2003 to 22 October 20032004: 19 March 2004 to 20 September 20042005: 16 May 2005 to 2 October 20052006: 13 April 2006 to 7 October 20062007: 29 April 2007 to 6 October 20072008: 15 April 2008 to 28 September 20082009: 23 April 2009 to 18 October 20092010: 28 April 2010 to 15 October 20102011: 2 April 2011 to 4 October 20112012: 26 March 2012 to 3 October 20122013: 28 April 2013 to 30 September 20132014: 26 April 2014 to 27 September 20142015: 16 March 2015 to 19 October 20152016: 6 May 2016 to 14 October 20162017: 19 March 2017 to 22 September 20172018: 29 April 2018 to 3 October 20182019: 20 April 2019 to 17 October 20192020: 31 May 2020 to 9 October 20202021: 4 April 2021 to 26 October 20212022: 22 April 2022 to 11 October 20222023: 11 April 2023 to 20 October 20232024: 13 April 2024 to 17 October 20242025: 27 March 2025 to 11 October 20252026: 19 March 2026 to 12 October 202619521958196419702005201120172023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Imperial Muni AP meeting 30 C (86 F).
First to last qualifying date each year at Imperial Muni AP
YearFirst dateLast date
19521952-05-041952-09-30
19531953-04-271953-10-12
19541954-04-061954-10-08
19551955-04-261955-10-19
19561956-05-081956-10-12
19571957-06-041957-09-30
19581958-05-211958-10-18
19591959-04-061959-10-25
19601960-04-211960-10-07
19611961-05-281961-10-05
19621962-04-191962-10-14
19631963-03-281963-10-05
19641964-04-161964-10-16
19651965-04-221965-10-09
19661966-05-041966-10-08
19671967-03-291967-10-12
19681968-03-301968-10-29
19691969-05-251969-10-02
19701970-05-071970-10-05
19711971-06-111971-10-10
20012001-04-192001-10-02
20022002-04-152002-09-16
20032003-04-142003-10-22
20042004-03-192004-09-20
20052005-05-162005-10-02
20062006-04-132006-10-07
20072007-04-292007-10-06
20082008-04-152008-09-28
20092009-04-232009-10-18
20102010-04-282010-10-15
20112011-04-022011-10-04
20122012-03-262012-10-03
20132013-04-282013-09-30
20142014-04-262014-09-27
20152015-03-162015-10-19
20162016-05-062016-10-14
20172017-03-192017-09-22
20182018-04-292018-10-03
20192019-04-202019-10-17
20202020-05-312020-10-09
20212021-04-042021-10-26
20222022-04-222022-10-11
20232023-04-112023-10-20
20242024-04-132024-10-17
20252025-03-272025-10-11
20262026-03-192026-10-12

Every Fixed Threshold

Fixed thresholds at Imperial Muni AP
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days461042022108
35 C (95 F): Days4660201224
40 C (104 F): Days30819542
90 F (32.2 C): Days4678201273
100 F (37.8 C): Days453420125
110 F (43.3 C): Days5119541
0 C (32 F): Ice days (max465220077
0 C (32 F): Frost days (min46190197081
-10 C (14 F): Days with min4676195521
-20 C (-4 F): Days with min451919633
-30 C (-22 F): Days with min3219681
20 C (68 F): Tropical nights (min421619555
10 mm (0.39 in): Days with 10 mm or more rain472319659
25 mm (0.98 in): Days with 25 mm or more rain44919652
50 mm (1.97 in): Days with 50 mm or more rain21419621
100 mm (3.94 in): Days with 100 mm or more rain2119581
10 cm (3.9 in): Days with 10 cm or more snowfall16519591

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1952.

Download the Data

  • Data for Imperial Muni AP 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).