Daily records
Page built 2026-10-19
Data as of 2025-12-31
Search
Built 2026-10-19 (19 October 2026)

Imperial Threshold Days by Year (USC00414425)

5 fixed thresholds counted per year at Imperial (USC00414425): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Imperial Thresholds

  • Imperial: days with 10 mm (0.39 in) or more of precipitation in 42 years, most in 1941 with 23.
  • Imperial: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1941 with 13.
  • Imperial: days with 50 mm (1.97 in) or more of precipitation in 20 years, most in 1986 with 4.
  • Imperial: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1941 with 1.
  • 5 fixed thresholds have at least one qualifying day at Imperial.
42 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Imperial Days per year at Imperial with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 23 in 1941. 01020301941: 231949: 91950: 81951: 51952: 71953: 11954: 71956: 31957: 111958: 91959: 81961: 131962: 31963: 41964: 41965: 91966: 71967: 71968: 141969: 121970: 71971: 21973: 71974: 151975: 131976: 121977: 111978: 81979: 51980: 71981: 151982: 61983: 41984: 131985: 61986: 161987: 141988: 81989: 51990: 131991: 121992: 20194119531959196519701976198119861991
Days per year at Imperial with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 23 in 1941.
Days with 10 mm (0.39 in) or more of precipitation per year at Imperial
YearDaysDecade average
19412316
1949916
195086.6
195156.6
195276.6
195316.6
195476.6
195636.6
1957116.6
195896.6
195986.6
1961138.1
196238.1
196348.1
196448.1
196598.1
196678.1
196778.1
1968148.1
1969128.1
197078.9
197128.9
197378.9
1974158.9
1975138.9
1976128.9
1977118.9
197888.9
197958.9
198079.4
1981159.4
198269.4
198349.4
1984139.4
198569.4
1986169.4
1987149.4
198889.4
198959.4
19901315
19911215
19922015
First to last qualifying date each year at Imperial For each year, a bar from the first to the last day at Imperial meeting 10 mm (0.39 in). 1941: 8 February 1941 to 12 December 19411949: 10 January 1949 to 30 December 19491950: 13 January 1950 to 5 September 19501951: 1 June 1951 to 11 September 19511952: 26 January 1952 to 31 December 19521953: 22 December 1953 to 22 December 19531954: 4 March 1954 to 6 October 19541956: 22 January 1956 to 16 October 19561957: 17 February 1957 to 18 November 19571958: 5 January 1958 to 28 October 19581959: 4 May 1959 to 14 November 19591961: 7 January 1961 to 1 November 19611962: 19 March 1962 to 19 November 19621963: 21 May 1963 to 19 November 19631964: 18 March 1964 to 24 September 19641965: 17 May 1965 to 17 October 19651966: 13 January 1966 to 6 October 19661967: 29 May 1967 to 14 December 19671968: 22 January 1968 to 26 November 19681969: 12 April 1969 to 29 December 19691970: 23 February 1970 to 28 September 19701971: 1 August 1971 to 15 August 19711973: 10 March 1973 to 31 August 19731974: 24 January 1974 to 25 December 19741975: 23 January 1975 to 27 December 19751976: 15 April 1976 to 12 November 19761977: 9 January 1977 to 29 November 19771978: 20 May 1978 to 4 November 19781979: 5 February 1979 to 13 December 19791980: 3 May 1980 to 7 December 19801981: 8 January 1981 to 21 October 19811982: 30 April 1982 to 9 December 19821983: 9 May 1983 to 5 November 19831984: 17 May 1984 to 23 December 19841985: 12 January 1985 to 17 October 19851986: 30 May 1986 to 28 December 19861987: 5 February 1987 to 25 December 19871988: 31 May 1988 to 9 December 19881989: 23 February 1989 to 13 September 19891990: 27 February 1990 to 16 December 19901991: 18 January 1991 to 21 December 19911992: 18 January 1992 to 14 December 19921941195419621968197519811987JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Imperial meeting 10 mm (0.39 in).
First to last qualifying date each year at Imperial
YearFirst dateLast date
19411941-02-081941-12-12
19491949-01-101949-12-30
19501950-01-131950-09-05
19511951-06-011951-09-11
19521952-01-261952-12-31
19531953-12-221953-12-22
19541954-03-041954-10-06
19561956-01-221956-10-16
19571957-02-171957-11-18
19581958-01-051958-10-28
19591959-05-041959-11-14
19611961-01-071961-11-01
19621962-03-191962-11-19
19631963-05-211963-11-19
19641964-03-181964-09-24
19651965-05-171965-10-17
19661966-01-131966-10-06
19671967-05-291967-12-14
19681968-01-221968-11-26
19691969-04-121969-12-29
19701970-02-231970-09-28
19711971-08-011971-08-15
19731973-03-101973-08-31
19741974-01-241974-12-25
19751975-01-231975-12-27
19761976-04-151976-11-12
19771977-01-091977-11-29
19781978-05-201978-11-04
19791979-02-051979-12-13
19801980-05-031980-12-07
19811981-01-081981-10-21
19821982-04-301982-12-09
19831983-05-091983-11-05
19841984-05-171984-12-23
19851985-01-121985-10-17
19861986-05-301986-12-28
19871987-02-051987-12-25
19881988-05-311988-12-09
19891989-02-231989-09-13
19901990-02-271990-12-16
19911991-01-181991-12-21
19921992-01-181992-12-14

Every Fixed Threshold

Fixed thresholds at Imperial
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain4223194120
25 mm (0.98 in): Days with 25 mm or more rain371319413
50 mm (1.97 in): Days with 50 mm or more rain20419862
100 mm (3.94 in): Days with 100 mm or more rain2119411
10 cm (3.9 in): Days with 10 cm or more snowfall2119691

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

  • Data for Imperial 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).