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

Mt Shasta Threshold Days by Year (USW00024215)

13 fixed thresholds counted per year at Mt Shasta (USW00024215): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mt Shasta Thresholds

  • Mt Shasta: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 2017 with 85.
  • Mt Shasta: days with a maximum temperature at or above 90 F (32.2 C) in 29 years, most in 2021 with 65.
  • Mt Shasta: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 2008 with 149.
  • Mt Shasta: days with a maximum temperature at or above 35 C (95 F) in 28 years, most in 2021 with 37.
  • 13 fixed thresholds have at least one qualifying day at Mt Shasta.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Mt Shasta Days per year at Mt Shasta with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 85 in 2017. 02550751001997: 241998: 401999: 282000: 332001: 412002: 482003: 572004: 412005: 442006: 542007: 472008: 482009: 632010: 522011: 592012: 722013: 642014: 702015: 722016: 702017: 852018: 622019: 582020: 742021: 772022: 842023: 672024: 772025: 601997200020032006200920122015201820212024
Days per year at Mt Shasta with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 85 in 2017.
Days at or above 30 C (86 F) per year at Mt Shasta
YearDaysDecade average
19972430.7
19984030.7
19992830.7
20003347.6
20014147.6
20024847.6
20035747.6
20044147.6
20054447.6
20065447.6
20074747.6
20084847.6
20096347.6
20105266.4
20115966.4
20127266.4
20136466.4
20147066.4
20157266.4
20167066.4
20178566.4
20186266.4
20195866.4
20207473.2
20217773.2
20228473.2
20236773.2
20247773.2
20256073.2
First to last qualifying date each year at Mt Shasta For each year, a bar from the first to the last day at Mt Shasta meeting 30 C (86 F). 1997: 11 May 1997 to 15 August 19971998: 6 July 1998 to 14 September 19981999: 23 May 1999 to 22 September 19992000: 21 May 2000 to 19 September 20002001: 22 May 2001 to 1 October 20012002: 25 June 2002 to 24 September 20022003: 23 May 2003 to 28 September 20032004: 21 June 2004 to 9 September 20042005: 26 May 2005 to 20 September 20052006: 15 May 2006 to 29 September 20062007: 30 May 2007 to 11 September 20072008: 15 May 2008 to 29 September 20082009: 21 April 2009 to 27 September 20092010: 24 June 2010 to 1 October 20102011: 21 June 2011 to 29 September 20112012: 13 May 2012 to 1 October 20122013: 10 May 2013 to 14 September 20132014: 14 May 2014 to 6 October 20142015: 28 May 2015 to 14 October 20152016: 18 May 2016 to 28 September 20162017: 22 May 2017 to 13 September 20172018: 3 June 2018 to 28 September 20182019: 2 June 2019 to 14 September 20192020: 9 May 2020 to 1 October 20202021: 29 April 2021 to 3 October 20212022: 25 May 2022 to 8 October 20222023: 28 April 2023 to 17 September 20232024: 16 May 2024 to 6 October 20242025: 30 May 2025 to 24 September 202519972001200520092013201720212025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mt Shasta meeting 30 C (86 F).
First to last qualifying date each year at Mt Shasta
YearFirst dateLast date
19971997-05-111997-08-15
19981998-07-061998-09-14
19991999-05-231999-09-22
20002000-05-212000-09-19
20012001-05-222001-10-01
20022002-06-252002-09-24
20032003-05-232003-09-28
20042004-06-212004-09-09
20052005-05-262005-09-20
20062006-05-152006-09-29
20072007-05-302007-09-11
20082008-05-152008-09-29
20092009-04-212009-09-27
20102010-06-242010-10-01
20112011-06-212011-09-29
20122012-05-132012-10-01
20132013-05-102013-09-14
20142014-05-142014-10-06
20152015-05-282015-10-14
20162016-05-182016-09-28
20172017-05-222017-09-13
20182018-06-032018-09-28
20192019-06-022019-09-14
20202020-05-092020-10-01
20212021-04-292021-10-03
20222022-05-252022-10-08
20232023-04-282023-09-17
20242024-05-162024-10-06
20252025-05-302025-09-24

Every Fixed Threshold

Fixed thresholds at Mt Shasta
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2985201760
35 C (95 F): Days283720217
40 C (104 F): Days2320243
90 F (32.2 C): Days2965202130
100 F (37.8 C): Days12820248
0 C (32 F): Ice days (max231520081
0 C (32 F): Frost days (min291492008100
-10 C (14 F): Days with min231120133
20 C (68 F): Tropical nights (min2120211
10 mm (0.39 in): Days with 10 mm or more rain2746201626
25 mm (0.98 in): Days with 25 mm or more rain2619201614
50 mm (1.97 in): Days with 50 mm or more rain22620044
100 mm (3.94 in): Days with 100 mm or more rain3120141

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1997.

Download the Data

  • Data for Mt Shasta 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).