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Built 2026-10-19 (19 October 2026)

Herman Threshold Days by Year (USC00203744)

17 fixed thresholds counted per year at Herman (USC00203744): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Herman Thresholds

  • Herman: days with 10 cm (3.9 in) or more of snowfall in 57 years, most in 1985 with 31.
  • Herman: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 2017 with 48.
  • Herman: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 1983 with 14.
  • Herman: nights with a minimum temperature at or below 0 C (32 F) in 54 years, most in 1972 with 225.
  • 17 fixed thresholds have at least one qualifying day at Herman.
48 years with a qualifying day
Days at or above 30 C (86 F) per year at Herman Days per year at Herman with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1975. 051015201969: 61970: 91971: 41972: 21973: 61974: 61975: 181976: 161977: 101978: 51979: 21980: 71981: 41982: 41983: 121984: 11985: 21986: 101987: 71989: 111990: 31991: 101992: 11994: 41995: 111996: 31999: 132002: 122005: 132006: 82009: 32010: 92011: 112012: 142013: 62014: 22015: 22016: 32017: 12018: 52019: 12020: 82021: 52022: 52023: 42024: 12025: 42026: 51969197419791984199019962009201420192024
Days per year at Herman with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 18 in 1975.
Days at or above 30 C (86 F) per year at Herman
YearDaysDecade average
196966
197097.8
197147.8
197227.8
197367.8
197467.8
1975187.8
1976167.8
1977107.8
197857.8
197927.8
198076.4
198146.4
198246.4
1983126.4
198416.4
198526.4
1986106.4
198776.4
1989116.4
199036.4
1991106.4
199216.4
199446.4
1995116.4
199636.4
1999136.4
2002129
2005139
200689
200939
201095.4
2011115.4
2012145.4
201365.4
201425.4
201525.4
201635.4
201715.4
201855.4
201915.4
202084.6
202154.6
202254.6
202344.6
202414.6
202544.6
202654.6
First to last qualifying date each year at Herman For each year, a bar from the first to the last day at Herman meeting 30 C (86 F). 1969: 27 May 1969 to 30 August 19691970: 8 June 1970 to 13 August 19701971: 27 June 1971 to 3 September 19711972: 19 May 1972 to 20 May 19721973: 7 July 1973 to 1 September 19731974: 21 May 1974 to 14 July 19741975: 22 May 1975 to 24 August 19751976: 7 June 1976 to 8 September 19761977: 16 May 1977 to 20 July 19771978: 26 May 1978 to 14 August 19781979: 11 July 1979 to 12 July 19791980: 22 April 1980 to 8 July 19801981: 6 July 1981 to 10 July 19811982: 5 July 1982 to 18 July 19821983: 22 June 1983 to 3 September 19831984: 29 August 1984 to 29 August 19841985: 27 June 1985 to 13 July 19851986: 28 May 1986 to 23 July 19861987: 23 June 1987 to 20 August 19871989: 5 July 1989 to 4 August 19891990: 25 April 1990 to 4 July 19901991: 27 June 1991 to 30 August 19911992: 2 October 1992 to 2 October 19921994: 20 May 1994 to 15 June 19941995: 17 June 1995 to 10 August 19951996: 27 June 1996 to 29 June 19961999: 29 May 1999 to 27 July 19992002: 10 June 2002 to 10 September 20022005: 23 June 2005 to 11 September 20052006: 30 May 2006 to 1 August 20062009: 21 May 2009 to 16 August 20092010: 24 May 2010 to 31 August 20102011: 9 June 2011 to 6 August 20112012: 19 May 2012 to 31 August 20122013: 31 May 2013 to 19 July 20132014: 1 June 2014 to 22 July 20142015: 28 July 2015 to 17 September 20152016: 7 May 2016 to 22 July 20162017: 11 June 2017 to 11 June 20172018: 30 May 2018 to 9 July 20182019: 4 July 2019 to 4 July 20192020: 26 May 2020 to 26 July 20202021: 5 June 2021 to 5 July 20212022: 14 May 2022 to 26 June 20222023: 1 June 2023 to 6 September 20232024: 27 August 2024 to 27 August 20242025: 13 May 2025 to 28 July 20252026: 1 July 2026 to 15 July 202619691975198119871995200920152021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Herman meeting 30 C (86 F).
First to last qualifying date each year at Herman
YearFirst dateLast date
19691969-05-271969-08-30
19701970-06-081970-08-13
19711971-06-271971-09-03
19721972-05-191972-05-20
19731973-07-071973-09-01
19741974-05-211974-07-14
19751975-05-221975-08-24
19761976-06-071976-09-08
19771977-05-161977-07-20
19781978-05-261978-08-14
19791979-07-111979-07-12
19801980-04-221980-07-08
19811981-07-061981-07-10
19821982-07-051982-07-18
19831983-06-221983-09-03
19841984-08-291984-08-29
19851985-06-271985-07-13
19861986-05-281986-07-23
19871987-06-231987-08-20
19891989-07-051989-08-04
19901990-04-251990-07-04
19911991-06-271991-08-30
19921992-10-021992-10-02
19941994-05-201994-06-15
19951995-06-171995-08-10
19961996-06-271996-06-29
19991999-05-291999-07-27
20022002-06-102002-09-10
20052005-06-232005-09-11
20062006-05-302006-08-01
20092009-05-212009-08-16
20102010-05-242010-08-31
20112011-06-092011-08-06
20122012-05-192012-08-31
20132013-05-312013-07-19
20142014-06-012014-07-22
20152015-07-282015-09-17
20162016-05-072016-07-22
20172017-06-112017-06-11
20182018-05-302018-07-09
20192019-07-042019-07-04
20202020-05-262020-07-26
20212021-06-052021-07-05
20222022-05-142022-06-26
20232023-06-012023-09-06
20242024-08-272024-08-27
20252025-05-132025-07-28
20262026-07-012026-07-15

Every Fixed Threshold

Fixed thresholds at Herman
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days481819755
35 C (95 F): Days4219752
90 F (32.2 C): Days25819762
0 C (32 F): Ice days (max52138201372
0 C (32 F): Frost days (min542251972119
-10 C (14 F): Days with min54120201453
-20 C (-4 F): Days with min5456201414
-30 C (-22 F): Days with min33919722
-40 C (-40 F): Days with min1119791
20 C (68 F): Tropical nights (min32620021
25 C (77 F): Days with min10n/a1
10 mm (0.39 in): Days with 10 mm or more rain5648201727
25 mm (0.98 in): Days with 25 mm or more rain561419836
50 mm (1.97 in): Days with 50 mm or more rain30419822
10 cm (3.9 in): Days with 10 cm or more snowfall5731198524
25 cm (9.8 in): Days with 25 cm or more snowfall50719754
50 cm (19.7 in): Days with 50 cm or more snowfall13219751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1969.

Download the Data

  • Data for Herman 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).