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Built 2026-10-19 (19 October 2026)

Hillsboro Threshold Days by Year (USC00473654)

18 fixed thresholds counted per year at Hillsboro (USC00473654): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hillsboro Thresholds

  • Hillsboro: days with 10 mm (0.39 in) or more of precipitation in 44 years, most in 1965 with 40.
  • Hillsboro: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 1972 with 13.
  • Hillsboro: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1976 with 68.
  • Hillsboro: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1996 with 88.
  • 18 fixed thresholds have at least one qualifying day at Hillsboro.
43 years with a qualifying day
Days at or above 30 C (86 F) per year at Hillsboro Days per year at Hillsboro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 68 in 1976. 0204060801959: 431960: 211961: 361962: 231963: 451964: 411965: 171966: 381967: 201968: 301971: 241972: 291975: 601976: 681979: 181980: 411983: 541984: 231985: 291986: 161987: 291988: 491989: 161990: 121991: 261992: 51993: 61994: 121995: 291996: 121997: 131998: 231999: 282000: 72001: 322002: 292003: 282004: 52005: 412006: 292007: 402008: 142009: 9195919641971198019871992199720022007
Days per year at Hillsboro with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 68 in 1976.
Days at or above 30 C (86 F) per year at Hillsboro
YearDaysDecade average
19594343
19602130.1
19613630.1
19622330.1
19634530.1
19644130.1
19651730.1
19663830.1
19672030.1
19683030.1
19712439.8
19722939.8
19756039.8
19766839.8
19791839.8
19804132.1
19835432.1
19842332.1
19852932.1
19861632.1
19872932.1
19884932.1
19891632.1
19901216.6
19912616.6
1992516.6
1993616.6
19941216.6
19952916.6
19961216.6
19971316.6
19982316.6
19992816.6
2000723.4
20013223.4
20022923.4
20032823.4
2004523.4
20054123.4
20062923.4
20074023.4
20081423.4
2009923.4
First to last qualifying date each year at Hillsboro For each year, a bar from the first to the last day at Hillsboro meeting 30 C (86 F). 1959: 2 May 1959 to 9 September 19591960: 8 July 1960 to 7 September 19601961: 9 June 1961 to 10 September 19611962: 15 May 1962 to 3 September 19621963: 2 June 1963 to 6 October 19631964: 18 May 1964 to 7 September 19641965: 2 May 1965 to 18 August 19651966: 26 May 1966 to 4 September 19661967: 18 May 1967 to 16 August 19671968: 4 June 1968 to 24 August 19681971: 15 May 1971 to 22 August 19711972: 17 May 1972 to 30 August 19721975: 18 May 1975 to 13 October 19751976: 7 June 1976 to 2 October 19761979: 11 May 1979 to 6 September 19791980: 22 April 1980 to 9 September 19801983: 11 June 1983 to 9 September 19831984: 9 July 1984 to 24 September 19841985: 18 April 1985 to 19 September 19851986: 31 May 1986 to 16 August 19861987: 7 June 1987 to 15 August 19871988: 28 May 1988 to 17 September 19881989: 2 July 1989 to 27 August 19891990: 12 June 1990 to 6 September 19901991: 6 April 1991 to 1 September 19911992: 11 June 1992 to 25 August 19921993: 11 August 1993 to 27 August 19931994: 15 June 1994 to 16 September 19941995: 18 June 1995 to 31 August 19951996: 18 May 1996 to 6 September 19961997: 23 June 1997 to 4 August 19971998: 15 May 1998 to 14 September 19981999: 6 June 1999 to 5 September 19992000: 9 June 2000 to 2 September 20002001: 16 May 2001 to 10 August 20012002: 16 April 2002 to 10 September 20022003: 15 April 2003 to 9 September 20032004: 8 June 2004 to 4 August 20042005: 7 June 2005 to 5 October 20052006: 29 May 2006 to 5 August 20062007: 30 April 2007 to 8 October 20072008: 21 June 2008 to 3 September 20082009: 25 April 2009 to 16 August 200919591965197519851991199720032009JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Hillsboro meeting 30 C (86 F).
First to last qualifying date each year at Hillsboro
YearFirst dateLast date
19591959-05-021959-09-09
19601960-07-081960-09-07
19611961-06-091961-09-10
19621962-05-151962-09-03
19631963-06-021963-10-06
19641964-05-181964-09-07
19651965-05-021965-08-18
19661966-05-261966-09-04
19671967-05-181967-08-16
19681968-06-041968-08-24
19711971-05-151971-08-22
19721972-05-171972-08-30
19751975-05-181975-10-13
19761976-06-071976-10-02
19791979-05-111979-09-06
19801980-04-221980-09-09
19831983-06-111983-09-09
19841984-07-091984-09-24
19851985-04-181985-09-19
19861986-05-311986-08-16
19871987-06-071987-08-15
19881988-05-281988-09-17
19891989-07-021989-08-27
19901990-06-121990-09-06
19911991-04-061991-09-01
19921992-06-111992-08-25
19931993-08-111993-08-27
19941994-06-151994-09-16
19951995-06-181995-08-31
19961996-05-181996-09-06
19971997-06-231997-08-04
19981998-05-151998-09-14
19991999-06-061999-09-05
20002000-06-092000-09-02
20012001-05-162001-08-10
20022002-04-162002-09-10
20032003-04-152003-09-09
20042004-06-082004-08-04
20052005-06-072005-10-05
20062006-05-292006-08-05
20072007-04-302007-10-08
20082008-06-212008-09-03
20092009-04-252009-08-16

Every Fixed Threshold

Fixed thresholds at Hillsboro
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days436819769
35 C (95 F): Days211019641
90 F (32.2 C): Days394019763
100 F (37.8 C): Days4419881
0 C (32 F): Ice days (max4388199668
0 C (32 F): Frost days (min401831996164
-10 C (14 F): Days with min4086198969
-20 C (-4 F): Days with min4048196327
-30 C (-22 F): Days with min251119633
-40 C (-40 F): Days with min2119631
20 C (68 F): Tropical nights (min391719882
25 C (77 F): Days with min4219642
10 mm (0.39 in): Days with 10 mm or more rain4440196527
25 mm (0.98 in): Days with 25 mm or more rain441319725
50 mm (1.97 in): Days with 50 mm or more rain33319593
100 mm (3.94 in): Days with 100 mm or more rain3119591
10 cm (3.9 in): Days with 10 cm or more snowfall32720083
25 cm (9.8 in): Days with 25 cm or more snowfall2119961

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1959.

Download the Data

  • Data for Hillsboro 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).