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Built 2026-10-19 (19 October 2026)

Rottnest Island Threshold Days by Year (ASN00009193)

11 fixed thresholds counted per year at Rottnest Island (ASN00009193): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rottnest Island Thresholds

  • Rottnest Island: days with a maximum temperature at or above 30 C (86 F) in 36 years, most in 2011 with 48.
  • Rottnest Island: days with a maximum temperature at or above 35 C (95 F) in 36 years, most in 2022 with 12.
  • Rottnest Island: days with a maximum temperature at or above 90 F (32.2 C) in 36 years, most in 2012 with 24.
  • Rottnest Island: nights with a minimum temperature at or above 20 C (68 F) in 36 years, most in 2011 with 79.
  • 11 fixed thresholds have at least one qualifying day at Rottnest Island.
36 years with a qualifying day
Days at or above 30 C (86 F) per year at Rottnest Island Days per year at Rottnest Island with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 48 in 2011. 02040601990: 251992: 201993: 151994: 241995: 211996: 281997: 241998: 211999: 282000: 262001: 152002: 282003: 182004: 252005: 182006: 222007: 182008: 182009: 272010: 302011: 482012: 422013: 262014: 282015: 222016: 342017: 182018: 142019: 212020: 302021: 332022: 302023: 262024: 252025: 292026: 11199019951999200320072011201520192023
Days per year at Rottnest Island with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 48 in 2011.
Days at or above 30 C (86 F) per year at Rottnest Island
YearDaysDecade average
19902522.9
19922022.9
19931522.9
19942422.9
19952122.9
19962822.9
19972422.9
19982122.9
19992822.9
20002621.5
20011521.5
20022821.5
20031821.5
20042521.5
20051821.5
20062221.5
20071821.5
20081821.5
20092721.5
20103028.3
20114828.3
20124228.3
20132628.3
20142828.3
20152228.3
20163428.3
20171828.3
20181428.3
20192128.3
20203026.3
20213326.3
20223026.3
20232626.3
20242526.3
20252926.3
20261126.3
First to last qualifying date each year at Rottnest Island For each year, a bar from the first to the last day at Rottnest Island meeting 30 C (86 F). 1990: 8 January 1990 to 12 December 19901992: 4 January 1992 to 17 December 19921993: 5 January 1993 to 26 December 19931994: 20 January 1994 to 30 December 19941995: 18 January 1995 to 14 October 19951996: 1 January 1996 to 20 December 19961997: 1 January 1997 to 26 December 19971998: 5 January 1998 to 15 December 19981999: 25 January 1999 to 31 December 19992000: 1 January 2000 to 28 December 20002001: 8 January 2001 to 13 November 20012002: 14 January 2002 to 25 December 20022003: 3 January 2003 to 26 December 20032004: 10 January 2004 to 28 December 20042005: 1 January 2005 to 6 April 20052006: 6 January 2006 to 27 December 20062007: 26 January 2007 to 26 December 20072008: 16 January 2008 to 14 December 20082009: 15 January 2009 to 29 December 20092010: 3 January 2010 to 27 December 20102011: 3 January 2011 to 29 December 20112012: 4 January 2012 to 31 December 20122013: 6 January 2013 to 16 December 20132014: 11 January 2014 to 30 December 20142015: 4 January 2015 to 28 December 20152016: 1 January 2016 to 21 December 20162017: 2 January 2017 to 11 December 20172018: 14 January 2018 to 22 December 20182019: 20 January 2019 to 18 December 20192020: 5 January 2020 to 29 December 20202021: 2 January 2021 to 29 December 20212022: 17 January 2022 to 23 December 20222023: 3 January 2023 to 25 December 20232024: 3 January 2024 to 23 December 20242025: 1 January 2025 to 25 December 20252026: 1 January 2026 to 19 March 202619901996200120062011201620212026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Rottnest Island meeting 30 C (86 F).
First to last qualifying date each year at Rottnest Island
YearFirst dateLast date
19901990-01-081990-12-12
19921992-01-041992-12-17
19931993-01-051993-12-26
19941994-01-201994-12-30
19951995-01-181995-10-14
19961996-01-011996-12-20
19971997-01-011997-12-26
19981998-01-051998-12-15
19991999-01-251999-12-31
20002000-01-012000-12-28
20012001-01-082001-11-13
20022002-01-142002-12-25
20032003-01-032003-12-26
20042004-01-102004-12-28
20052005-01-012005-04-06
20062006-01-062006-12-27
20072007-01-262007-12-26
20082008-01-162008-12-14
20092009-01-152009-12-29
20102010-01-032010-12-27
20112011-01-032011-12-29
20122012-01-042012-12-31
20132013-01-062013-12-16
20142014-01-112014-12-30
20152015-01-042015-12-28
20162016-01-012016-12-21
20172017-01-022017-12-11
20182018-01-142018-12-22
20192019-01-202019-12-18
20202020-01-052020-12-29
20212021-01-022021-12-29
20222022-01-172022-12-23
20232023-01-032023-12-25
20242024-01-032024-12-23
20252025-01-012025-12-25
20262026-01-012026-03-19

Every Fixed Threshold

Fixed thresholds at Rottnest Island
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3648201111
35 C (95 F): Days361220224
40 C (104 F): Days9219971
90 F (32.2 C): Days362420128
100 F (37.8 C): Days25620241
20 C (68 F): Tropical nights (min3679201135
25 C (77 F): Days with min9220121
10 mm (0.39 in): Days with 10 mm or more rain322720087
25 mm (0.98 in): Days with 25 mm or more rain30720053
50 mm (1.97 in): Days with 50 mm or more rain9219991
100 mm (3.94 in): Days with 100 mm or more rain1120181

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1990.

Download the Data

  • Data for Rottnest Island 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).