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Built 2026-10-18 (18 October 2026)

Perwell Threshold Days by Year

4 fixed thresholds counted per year at Perwell (ASN00044100): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Perwell Thresholds

  • Perwell: days with 10 mm (0.39 in) or more of precipitation in 27 years, most in 1978 with 30.
  • Perwell: days with 25 mm (0.98 in) or more of precipitation in 27 years, most in 1988 with 14.
  • Perwell: days with 50 mm (1.97 in) or more of precipitation in 18 years, most in 1988 with 6.
  • Perwell: days with 100 mm (3.94 in) or more of precipitation in 4 years, most in 1969 with 1.
  • 4 fixed thresholds have at least one qualifying day at Perwell.
27 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Perwell Days per year at Perwell with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1978. 01020301959: 211960: 181961: 221963: 251964: 171966: 131967: 141968: 191969: 181970: 161971: 171972: 141973: 191974: 171975: 221976: 191977: 151978: 301979: 111980: 101981: 141982: 141987: 231988: 221989: 161990: 211991: 20195919631967197019731976197919821989
Days per year at Perwell with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 30 in 1978.
Days with 10 mm (0.39 in) or more of precipitation per year at Perwell
YearDaysDecade average
19592121
19601818.3
19612218.3
19632518.3
19641718.3
19661318.3
19671418.3
19681918.3
19691818.3
19701618
19711718
19721418
19731918
19741718
19752218
19761918
19771518
19783018
19791118
19801016.5
19811416.5
19821416.5
19872316.5
19882216.5
19891616.5
19902120.5
19912020.5
First to last qualifying date each year at Perwell For each year, a bar from the first to the last day at Perwell meeting 10 mm (0.39 in). 1959: 9 January 1959 to 18 December 19591960: 21 January 1960 to 13 December 19601961: 5 January 1961 to 18 December 19611963: 8 January 1963 to 7 December 19631964: 14 January 1964 to 22 December 19641966: 7 January 1966 to 9 November 19661967: 19 January 1967 to 29 December 19671968: 5 January 1968 to 22 December 19681969: 10 January 1969 to 13 December 19691970: 29 January 1970 to 26 December 19701971: 19 January 1971 to 27 December 19711972: 3 January 1972 to 28 November 19721973: 13 January 1973 to 31 December 19731974: 7 January 1974 to 17 November 19741975: 3 January 1975 to 28 December 19751976: 22 January 1976 to 23 December 19761977: 13 January 1977 to 25 October 19771978: 6 January 1978 to 26 December 19781979: 3 March 1979 to 11 November 19791980: 27 January 1980 to 29 December 19801981: 2 January 1981 to 14 December 19811982: 15 January 1982 to 30 December 19821987: 1 January 1987 to 12 December 19871988: 23 January 1988 to 21 November 19881989: 5 January 1989 to 15 December 19891990: 13 January 1990 to 9 December 19901991: 4 January 1991 to 29 December 19911959196419691973197719811989JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Perwell meeting 10 mm (0.39 in).
First to last qualifying date each year at Perwell
YearFirst dateLast date
19591959-01-091959-12-18
19601960-01-211960-12-13
19611961-01-051961-12-18
19631963-01-081963-12-07
19641964-01-141964-12-22
19661966-01-071966-11-09
19671967-01-191967-12-29
19681968-01-051968-12-22
19691969-01-101969-12-13
19701970-01-291970-12-26
19711971-01-191971-12-27
19721972-01-031972-11-28
19731973-01-131973-12-31
19741974-01-071974-11-17
19751975-01-031975-12-28
19761976-01-221976-12-23
19771977-01-131977-10-25
19781978-01-061978-12-26
19791979-03-031979-11-11
19801980-01-271980-12-29
19811981-01-021981-12-14
19821982-01-151982-12-30
19871987-01-011987-12-12
19881988-01-231988-11-21
19891989-01-051989-12-15
19901990-01-131990-12-09
19911991-01-041991-12-29

Every Fixed Threshold

Fixed thresholds at Perwell
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2730197820
25 mm (0.98 in): Days with 25 mm or more rain2714198810
50 mm (1.97 in): Days with 50 mm or more rain18619884
100 mm (3.94 in): Days with 100 mm or more rain4119691

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 Perwell 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).