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Built 2026-10-19 (19 October 2026)

Kopperston Threshold Days by Year (USC00464956)

15 fixed thresholds counted per year at Kopperston (USC00464956): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Kopperston Thresholds

  • Kopperston: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1988 with 51.
  • Kopperston: days with a maximum temperature at or below 0 C (32 F) in 30 years, most in 1977 with 31.
  • Kopperston: nights with a minimum temperature at or below 0 C (32 F) in 30 years, most in 1988 with 156.
  • Kopperston: nights with a minimum temperature at or below -10 C (14 F) in 30 years, most in 1977 with 41.
  • 15 fixed thresholds have at least one qualifying day at Kopperston.
30 years with a qualifying day
Days at or above 30 C (86 F) per year at Kopperston Days per year at Kopperston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 51 in 1988. 02040601964: 391965: 191966: 281967: 101968: 241969: 311970: 431971: 161972: 121973: 401974: 141975: 281976: 321977: 301978: 241979: 121980: 231981: 31982: 11983: 441984: 241985: 161986: 261987: 471988: 511989: 151990: 221991: 171992: 41993: 111964196719701973197619791982198519881991
Days per year at Kopperston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 51 in 1988.
Days at or above 30 C (86 F) per year at Kopperston
YearDaysDecade average
19643925.2
19651925.2
19662825.2
19671025.2
19682425.2
19693125.2
19704325.1
19711625.1
19721225.1
19734025.1
19741425.1
19752825.1
19763225.1
19773025.1
19782425.1
19791225.1
19802325
1981325
1982125
19834425
19842425
19851625
19862625
19874725
19885125
19891525
19902213.5
19911713.5
1992413.5
19931113.5
First to last qualifying date each year at Kopperston For each year, a bar from the first to the last day at Kopperston meeting 30 C (86 F). 1964: 19 May 1964 to 11 September 19641965: 25 May 1965 to 20 September 19651966: 8 May 1966 to 29 July 19661967: 27 May 1967 to 1 July 19671968: 6 June 1968 to 19 August 19681969: 7 May 1969 to 31 August 19691970: 1 May 1970 to 17 September 19701971: 18 May 1971 to 6 September 19711972: 15 June 1972 to 25 August 19721973: 3 June 1973 to 4 September 19731974: 14 May 1974 to 28 August 19741975: 25 May 1975 to 5 September 19751976: 17 April 1976 to 26 August 19761977: 16 May 1977 to 4 September 19771978: 2 June 1978 to 28 August 19781979: 8 May 1979 to 13 August 19791980: 15 June 1980 to 8 August 19801981: 14 June 1981 to 11 July 19811982: 17 July 1982 to 17 July 19821983: 13 June 1983 to 11 September 19831984: 26 April 1984 to 9 August 19841985: 21 April 1985 to 9 September 19851986: 27 April 1986 to 16 August 19861987: 23 April 1987 to 28 August 19871988: 24 May 1988 to 29 August 19881989: 30 May 1989 to 5 August 19891990: 27 April 1990 to 8 September 19901991: 27 May 1991 to 31 August 19911992: 12 July 1992 to 15 July 19921993: 6 July 1993 to 25 August 199319641968197219761980198419881992JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Kopperston meeting 30 C (86 F).
First to last qualifying date each year at Kopperston
YearFirst dateLast date
19641964-05-191964-09-11
19651965-05-251965-09-20
19661966-05-081966-07-29
19671967-05-271967-07-01
19681968-06-061968-08-19
19691969-05-071969-08-31
19701970-05-011970-09-17
19711971-05-181971-09-06
19721972-06-151972-08-25
19731973-06-031973-09-04
19741974-05-141974-08-28
19751975-05-251975-09-05
19761976-04-171976-08-26
19771977-05-161977-09-04
19781978-06-021978-08-28
19791979-05-081979-08-13
19801980-06-151980-08-08
19811981-06-141981-07-11
19821982-07-171982-07-17
19831983-06-131983-09-11
19841984-04-261984-08-09
19851985-04-211985-09-09
19861986-04-271986-08-16
19871987-04-231987-08-28
19881988-05-241988-08-29
19891989-05-301989-08-05
19901990-04-271990-09-08
19911991-05-271991-08-31
19921992-07-121992-07-15
19931993-07-061993-08-25

Every Fixed Threshold

Fixed thresholds at Kopperston
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3051198811
35 C (95 F): Days2819888
90 F (32.2 C): Days232619882
0 C (32 F): Ice days (max3031197725
0 C (32 F): Frost days (min301561988129
-10 C (14 F): Days with min3041197720
-20 C (-4 F): Days with min16419772
20 C (68 F): Tropical nights (min19619683
10 mm (0.39 in): Days with 10 mm or more rain3064197940
25 mm (0.98 in): Days with 25 mm or more rain301919799
50 mm (1.97 in): Days with 50 mm or more rain17319802
100 mm (3.94 in): Days with 100 mm or more rain1119641
10 cm (3.9 in): Days with 10 cm or more snowfall21519783
25 cm (9.8 in): Days with 25 cm or more snowfall5119671
50 cm (19.7 in): Days with 50 cm or more snowfall1119931

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1964.

Download the Data

  • Data for Kopperston 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).