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Built 2026-10-17 (17 October 2026)

Derby Post Office Threshold Days by Year

4 fixed thresholds counted per year at Derby Post Office (ASN00091024): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Derby Post Office Thresholds

  • Derby Post Office: days with 10 mm (0.39 in) or more of precipitation in 38 years, most in 1956 with 55.
  • Derby Post Office: days with 25 mm (0.98 in) or more of precipitation in 38 years, most in 1942 with 17.
  • Derby Post Office: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1939 with 4.
  • Derby Post Office: days with 100 mm (3.94 in) or more of precipitation in 1 years, most in 1961 with 1.
  • 4 fixed thresholds have at least one qualifying day at Derby Post Office.
38 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Derby Post Office Days per year at Derby Post Office with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1956. 02040601937: 341938: 341939: 451940: 271941: 251942: 491943: 351944: 411945: 351946: 471948: 301949: 291950: 341954: 201955: 461956: 551957: 291958: 451959: 251960: 381961: 291962: 471963: 321964: 461965: 301966: 321967: 201968: 431969: 321970: 511971: 541972: 251973: 431974: 541975: 431976: 331977: 311978: 351937194119451950195719611965196919731977
Days per year at Derby Post Office with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1956.
Days with 10 mm (0.39 in) or more of precipitation per year at Derby Post Office
YearDaysDecade average
19373437.7
19383437.7
19394537.7
19402735.3
19412535.3
19424935.3
19433535.3
19444135.3
19453535.3
19464735.3
19483035.3
19492935.3
19503436.3
19542036.3
19554636.3
19565536.3
19572936.3
19584536.3
19592536.3
19603834.9
19612934.9
19624734.9
19633234.9
19644634.9
19653034.9
19663234.9
19672034.9
19684334.9
19693234.9
19705141
19715441
19722541
19734341
19745441
19754341
19763341
19773141
19783541
First to last qualifying date each year at Derby Post Office For each year, a bar from the first to the last day at Derby Post Office meeting 10 mm (0.39 in). 1937: 2 January 1937 to 26 December 19371938: 4 January 1938 to 29 December 19381939: 17 February 1939 to 29 November 19391940: 19 January 1940 to 28 December 19401941: 4 January 1941 to 9 December 19411942: 8 January 1942 to 29 December 19421943: 3 January 1943 to 1 December 19431944: 4 January 1944 to 31 December 19441945: 16 January 1945 to 17 December 19451946: 4 January 1946 to 17 December 19461948: 13 January 1948 to 19 December 19481949: 16 January 1949 to 21 December 19491950: 9 January 1950 to 8 December 19501954: 2 February 1954 to 12 December 19541955: 29 January 1955 to 31 December 19551956: 1 January 1956 to 19 December 19561957: 8 February 1957 to 26 December 19571958: 1 February 1958 to 17 December 19581959: 7 January 1959 to 28 December 19591960: 1 February 1960 to 8 December 19601961: 26 February 1961 to 18 December 19611962: 18 January 1962 to 12 December 19621963: 4 January 1963 to 16 December 19631964: 7 February 1964 to 29 December 19641965: 11 January 1965 to 2 December 19651966: 7 February 1966 to 19 December 19661967: 16 January 1967 to 30 December 19671968: 21 February 1968 to 24 December 19681969: 3 January 1969 to 30 December 19691970: 3 January 1970 to 29 December 19701971: 2 January 1971 to 21 December 19711972: 1 January 1972 to 25 November 19721973: 13 January 1973 to 31 December 19731974: 5 January 1974 to 19 December 19741975: 10 January 1975 to 26 November 19751976: 8 January 1976 to 23 December 19761977: 16 January 1977 to 3 December 19771978: 6 January 1978 to 4 December 197819371942194819561961196619711976JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Derby Post Office meeting 10 mm (0.39 in).
First to last qualifying date each year at Derby Post Office
YearFirst dateLast date
19371937-01-021937-12-26
19381938-01-041938-12-29
19391939-02-171939-11-29
19401940-01-191940-12-28
19411941-01-041941-12-09
19421942-01-081942-12-29
19431943-01-031943-12-01
19441944-01-041944-12-31
19451945-01-161945-12-17
19461946-01-041946-12-17
19481948-01-131948-12-19
19491949-01-161949-12-21
19501950-01-091950-12-08
19541954-02-021954-12-12
19551955-01-291955-12-31
19561956-01-011956-12-19
19571957-02-081957-12-26
19581958-02-011958-12-17
19591959-01-071959-12-28
19601960-02-011960-12-08
19611961-02-261961-12-18
19621962-01-181962-12-12
19631963-01-041963-12-16
19641964-02-071964-12-29
19651965-01-111965-12-02
19661966-02-071966-12-19
19671967-01-161967-12-30
19681968-02-211968-12-24
19691969-01-031969-12-30
19701970-01-031970-12-29
19711971-01-021971-12-21
19721972-01-011972-11-25
19731973-01-131973-12-31
19741974-01-051974-12-19
19751975-01-101975-11-26
19761976-01-081976-12-23
19771977-01-161977-12-03
19781978-01-061978-12-04

Every Fixed Threshold

Fixed thresholds at Derby Post Office
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3855195635
25 mm (0.98 in): Days with 25 mm or more rain3817194210
50 mm (1.97 in): Days with 50 mm or more rain27419392
100 mm (3.94 in): Days with 100 mm or more rain1119611

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1937.

Download the Data

  • Data for Derby Post Office 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

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