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Built 2026-10-19 (19 October 2026)

Old Faithful Threshold Days by Year (USC00486845)

14 fixed thresholds counted per year at Old Faithful (USC00486845): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Old Faithful Thresholds

  • Old Faithful: days with a maximum temperature at or below 0 C (32 F) in 40 years, most in 1911 with 105.
  • Old Faithful: nights with a minimum temperature at or below 0 C (32 F) in 40 years, most in 1979 with 301.
  • Old Faithful: nights with a minimum temperature at or below -10 C (14 F) in 40 years, most in 1979 with 138.
  • Old Faithful: nights with a minimum temperature at or below -20 C (-4 F) in 40 years, most in 1997 with 69.
  • 14 fixed thresholds have at least one qualifying day at Old Faithful.
24 years with a qualifying day
Days at or above 30 C (86 F) per year at Old Faithful Days per year at Old Faithful with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 9 in 1936. 0358101907: 51936: 91986: 21987: 11988: 31990: 21994: 71997: 21998: 41999: 22000: 22002: 62003: 92005: 22006: 22007: 62008: 22013: 52015: 42016: 12017: 62020: 32021: 62022: 719071987199419992003200720152020
Days per year at Old Faithful with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 9 in 1936.
Days at or above 30 C (86 F) per year at Old Faithful
YearDaysDecade average
190755
193699
198622
198712
198832
199023.4
199473.4
199723.4
199843.4
199923.4
200024.1
200264.1
200394.1
200524.1
200624.1
200764.1
200824.1
201354
201544
201614
201764
202035.3
202165.3
202275.3
First to last qualifying date each year at Old Faithful For each year, a bar from the first to the last day at Old Faithful meeting 30 C (86 F). 1907: 29 July 1907 to 8 August 19071936: 23 June 1936 to 8 August 19361986: 3 July 1986 to 6 August 19861987: 31 July 1987 to 31 July 19871988: 25 June 1988 to 31 July 19881990: 8 August 1990 to 9 August 19901994: 20 June 1994 to 15 August 19941997: 3 August 1997 to 4 August 19971998: 17 July 1998 to 22 July 19981999: 28 July 1999 to 1 August 19992000: 1 August 2000 to 2 August 20002002: 11 July 2002 to 16 July 20022003: 17 July 2003 to 16 August 20032005: 14 July 2005 to 22 July 20052006: 21 July 2006 to 22 July 20062007: 6 July 2007 to 23 July 20072008: 1 July 2008 to 23 July 20082013: 29 June 2013 to 6 July 20132015: 28 June 2015 to 3 August 20152016: 29 June 2016 to 29 June 20162017: 6 July 2017 to 7 September 20172020: 17 August 2020 to 6 September 20202021: 4 July 2021 to 28 July 20212022: 18 July 2022 to 8 September 202219071987199419992003200720152020JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Old Faithful meeting 30 C (86 F).
First to last qualifying date each year at Old Faithful
YearFirst dateLast date
19071907-07-291907-08-08
19361936-06-231936-08-08
19861986-07-031986-08-06
19871987-07-311987-07-31
19881988-06-251988-07-31
19901990-08-081990-08-09
19941994-06-201994-08-15
19971997-08-031997-08-04
19981998-07-171998-07-22
19991999-07-281999-08-01
20002000-08-012000-08-02
20022002-07-112002-07-16
20032003-07-172003-08-16
20052005-07-142005-07-22
20062006-07-212006-07-22
20072007-07-062007-07-23
20082008-07-012008-07-23
20132013-06-292013-07-06
20152015-06-282015-08-03
20162016-06-292016-06-29
20172017-07-062017-09-07
20202020-08-172020-09-06
20212021-07-042021-07-28
20222022-07-182022-09-08

Every Fixed Threshold

Fixed thresholds at Old Faithful
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days24919367
90 F (32.2 C): Days4520021
0 C (32 F): Ice days (max4010519118
0 C (32 F): Frost days (min40301197940
-10 C (14 F): Days with min40138197925
-20 C (-4 F): Days with min4069199711
-30 C (-22 F): Days with min402419793
-40 C (-40 F): Days with min12519901
10 mm (0.39 in): Days with 10 mm or more rain382719952
25 mm (0.98 in): Days with 25 mm or more rain24520161
50 mm (1.97 in): Days with 50 mm or more rain2119971
10 cm (3.9 in): Days with 10 cm or more snowfall382820146
25 cm (9.8 in): Days with 25 cm or more snowfall30620193
50 cm (19.7 in): Days with 50 cm or more snowfall1120201

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

Download the Data

  • Data for Old Faithful 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 (2026-10-12).