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Built 2026-10-19 (19 October 2026)

Flagstaff 4 SW Threshold Days by Year (USC00023009)

15 fixed thresholds counted per year at Flagstaff 4 SW (USC00023009): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Flagstaff 4 SW Thresholds

  • Flagstaff 4 SW: days with a maximum temperature at or above 30 C (86 F) in 38 years, most in 2002 with 34.
  • Flagstaff 4 SW: days with a maximum temperature at or below 0 C (32 F) in 38 years, most in 1990 with 25.
  • Flagstaff 4 SW: nights with a minimum temperature at or below 0 C (32 F) in 38 years, most in 1989 with 266.
  • Flagstaff 4 SW: nights with a minimum temperature at or below -10 C (14 F) in 38 years, most in 1989 with 98.
  • 15 fixed thresholds have at least one qualifying day at Flagstaff 4 SW.
38 years with a qualifying day
Days at or above 30 C (86 F) per year at Flagstaff 4 SW Days per year at Flagstaff 4 SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 2002. 0102030401985: 161986: 51987: 31988: 51989: 151990: 131991: 71992: 21993: 61994: 241995: 161996: 251997: 91999: 42000: 212001: 112002: 342003: 242004: 42005: 142006: 172007: 152008: 92010: 52011: 102012: 62013: 132015: 62016: 162017: 182018: 182019: 152021: 122022: 112023: 182024: 182025: 302026: 221985198919931997200220062011201620212025
Days per year at Flagstaff 4 SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 34 in 2002.
Days at or above 30 C (86 F) per year at Flagstaff 4 SW
YearDaysDecade average
1985168.8
198658.8
198738.8
198858.8
1989158.8
19901311.8
1991711.8
1992211.8
1993611.8
19942411.8
19951611.8
19962511.8
1997911.8
1999411.8
20002116.6
20011116.6
20023416.6
20032416.6
2004416.6
20051416.6
20061716.6
20071516.6
2008916.6
2010511.9
20111011.9
2012611.9
20131311.9
2015611.9
20161611.9
20171811.9
20181811.9
20191511.9
20211218.5
20221118.5
20231818.5
20241818.5
20253018.5
20262218.5
First to last qualifying date each year at Flagstaff 4 SW For each year, a bar from the first to the last day at Flagstaff 4 SW meeting 30 C (86 F). 1985: 8 June 1985 to 25 August 19851986: 28 June 1986 to 20 August 19861987: 14 July 1987 to 25 July 19871988: 23 June 1988 to 24 July 19881989: 19 June 1989 to 8 August 19891990: 22 June 1990 to 13 September 19901991: 2 July 1991 to 2 September 19911992: 20 July 1992 to 3 August 19921993: 27 June 1993 to 4 August 19931994: 24 June 1994 to 15 August 19941995: 8 July 1995 to 1 September 19951996: 13 May 1996 to 1 September 19961997: 3 July 1997 to 26 July 19971999: 30 June 1999 to 3 July 19992000: 19 July 2000 to 17 September 20002001: 22 June 2001 to 28 August 20012002: 31 May 2002 to 19 August 20022003: 29 June 2003 to 14 August 20032004: 7 July 2004 to 23 July 20042005: 21 June 2005 to 22 July 20052006: 5 June 2006 to 26 July 20062007: 17 June 2007 to 22 July 20072008: 20 June 2008 to 3 August 20082010: 5 June 2010 to 18 July 20102011: 22 June 2011 to 24 August 20112012: 1 June 2012 to 10 August 20122013: 6 June 2013 to 9 July 20132015: 20 June 2015 to 20 August 20152016: 3 June 2016 to 29 July 20162017: 17 June 2017 to 4 September 20172018: 12 June 2018 to 7 August 20182019: 16 July 2019 to 4 September 20192021: 14 June 2021 to 11 July 20212022: 10 June 2022 to 6 September 20222023: 2 July 2023 to 27 July 20232024: 5 June 2024 to 20 August 20242025: 15 June 2025 to 22 August 20252026: 23 June 2026 to 28 August 202619851990199520012006201220182024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Flagstaff 4 SW meeting 30 C (86 F).
First to last qualifying date each year at Flagstaff 4 SW
YearFirst dateLast date
19851985-06-081985-08-25
19861986-06-281986-08-20
19871987-07-141987-07-25
19881988-06-231988-07-24
19891989-06-191989-08-08
19901990-06-221990-09-13
19911991-07-021991-09-02
19921992-07-201992-08-03
19931993-06-271993-08-04
19941994-06-241994-08-15
19951995-07-081995-09-01
19961996-05-131996-09-01
19971997-07-031997-07-26
19991999-06-301999-07-03
20002000-07-192000-09-17
20012001-06-222001-08-28
20022002-05-312002-08-19
20032003-06-292003-08-14
20042004-07-072004-07-23
20052005-06-212005-07-22
20062006-06-052006-07-26
20072007-06-172007-07-22
20082008-06-202008-08-03
20102010-06-052010-07-18
20112011-06-222011-08-24
20122012-06-012012-08-10
20132013-06-062013-07-09
20152015-06-202015-08-20
20162016-06-032016-07-29
20172017-06-172017-09-04
20182018-06-122018-08-07
20192019-07-162019-09-04
20212021-06-142021-07-11
20222022-06-102022-09-06
20232023-07-022023-07-27
20242024-06-052024-08-20
20252025-06-152025-08-22
20262026-06-232026-08-28

Every Fixed Threshold

Fixed thresholds at Flagstaff 4 SW
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3834200222
35 C (95 F): Days3220031
90 F (32.2 C): Days261019942
0 C (32 F): Ice days (max382519906
0 C (32 F): Frost days (min382661989151
-10 C (14 F): Days with min3898198921
-20 C (-4 F): Days with min372319901
-30 C (-22 F): Days with min5419901
10 mm (0.39 in): Days with 10 mm or more rain3528199216
25 mm (0.98 in): Days with 25 mm or more rain351120104
50 mm (1.97 in): Days with 50 mm or more rain15219921
100 mm (3.94 in): Days with 100 mm or more rain1120231
10 cm (3.9 in): Days with 10 cm or more snowfall351419912
25 cm (9.8 in): Days with 25 cm or more snowfall29620231
50 cm (19.7 in): Days with 50 cm or more snowfall6220231

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1985.

Download the Data

  • Data for Flagstaff 4 SW 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).