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Built 2026-10-18 (18 October 2026)

Botany No.1 Dam Threshold Days by Year

5 fixed thresholds counted per year at Botany No.1 Dam (ASN00066007): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Botany No.1 Dam Thresholds

  • Botany No.1 Dam: days with 10 mm (0.39 in) or more of precipitation in 63 years, most in 1890 with 54.
  • Botany No.1 Dam: days with 25 mm (0.98 in) or more of precipitation in 63 years, most in 1890 with 25.
  • Botany No.1 Dam: days with 50 mm (1.97 in) or more of precipitation in 61 years, most in 1963 with 11.
  • Botany No.1 Dam: days with 100 mm (3.94 in) or more of precipitation in 33 years, most in 1900 with 4.
  • 5 fixed thresholds have at least one qualifying day at Botany No.1 Dam.
63 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Botany No.1 Dam Days per year at Botany No.1 Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 1890. 02040601870: 451880: 211881: 331882: 221883: 251884: 281885: 231886: 281887: 491888: 201889: 311890: 541891: 421892: 531893: 371894: 291895: 151896: 251897: 271898: 311899: 371900: 391901: 261902: 361903: 281904: 341905: 251906: 221907: 261908: 291909: 321910: 301911: 281912: 371913: 381914: 371915: 291916: 351917: 431918: 291919: 331944: 201945: 261951: 291952: 261953: 241954: 231955: 281956: 251957: 141958: 261959: 381960: 291961: 281962: 251963: 451967: 231969: 291970: 191971: 191972: 221974: 251977: 11187018861893190019071914194519571967
Days per year at Botany No.1 Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 1890.
Days with 10 mm (0.39 in) or more of precipitation per year at Botany No.1 Dam
YearDaysDecade average
18704545
18802128
18813328
18822228
18832528
18842828
18852328
18862828
18874928
18882028
18893128
18905435
18914235
18925335
18933735
18942935
18951535
18962535
18972735
18983135
18993735
19003929.7
19012629.7
19023629.7
19032829.7
19043429.7
19052529.7
19062229.7
19072629.7
19082929.7
19093229.7
19103033.9
19112833.9
19123733.9
19133833.9
19143733.9
19152933.9
19163533.9
19174333.9
19182933.9
19193333.9
19442023
19452623
19512925.9
19522625.9
19532425.9
19542325.9
19552825.9
19562525.9
19571425.9
19582625.9
19593825.9
19602929.8
19612829.8
19622529.8
19634529.8
19672329.8
19692929.8
19701919.2
19711919.2
19722219.2
19742519.2
19771119.2
First to last qualifying date each year at Botany No.1 Dam For each year, a bar from the first to the last day at Botany No.1 Dam meeting 10 mm (0.39 in). 1870: 15 January 1870 to 31 December 18701880: 25 January 1880 to 10 November 18801881: 14 January 1881 to 22 November 18811882: 5 March 1882 to 11 December 18821883: 2 February 1883 to 25 December 18831884: 27 January 1884 to 15 December 18841885: 12 January 1885 to 26 December 18851886: 28 January 1886 to 13 December 18861887: 21 January 1887 to 29 December 18871888: 10 February 1888 to 20 December 18881889: 4 January 1889 to 11 December 18891890: 4 January 1890 to 15 December 18901891: 11 January 1891 to 28 November 18911892: 11 January 1892 to 31 December 18921893: 1 January 1893 to 30 December 18931894: 14 January 1894 to 16 December 18941895: 16 January 1895 to 30 December 18951896: 26 January 1896 to 27 November 18961897: 10 January 1897 to 20 December 18971898: 13 January 1898 to 31 December 18981899: 12 January 1899 to 7 November 18991900: 11 January 1900 to 6 December 19001901: 2 January 1901 to 18 November 19011902: 1 January 1902 to 12 December 19021903: 5 January 1903 to 7 December 19031904: 3 January 1904 to 19 December 19041905: 30 January 1905 to 16 December 19051906: 1 January 1906 to 25 December 19061907: 27 January 1907 to 28 December 19071908: 30 January 1908 to 18 December 19081909: 6 January 1909 to 24 December 19091910: 12 January 1910 to 19 December 19101911: 12 January 1911 to 2 December 19111912: 6 January 1912 to 13 December 19121913: 7 March 1913 to 13 November 19131914: 20 January 1914 to 31 December 19141915: 9 January 1915 to 18 December 19151916: 29 January 1916 to 14 December 19161917: 23 January 1917 to 9 December 19171918: 12 January 1918 to 28 December 19181919: 5 January 1919 to 29 December 19191944: 2 January 1944 to 17 October 19441945: 13 January 1945 to 28 December 19451951: 17 January 1951 to 21 December 19511952: 7 January 1952 to 29 December 19521953: 6 January 1953 to 27 November 19531954: 4 January 1954 to 17 December 19541955: 24 January 1955 to 20 December 19551956: 26 January 1956 to 5 December 19561957: 23 January 1957 to 31 December 19571958: 23 January 1958 to 19 December 19581959: 2 January 1959 to 21 December 19591960: 4 January 1960 to 20 December 19601961: 3 January 1961 to 27 December 19611962: 2 January 1962 to 19 December 19621963: 4 January 1963 to 31 December 19631967: 5 January 1967 to 16 November 19671969: 2 January 1969 to 23 December 19691970: 12 January 1970 to 30 December 19701971: 20 January 1971 to 8 December 19711972: 13 January 1972 to 26 December 19721974: 11 January 1974 to 23 October 19741977: 27 January 1977 to 30 November 197718701887189519031911191919561967JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Botany No.1 Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Botany No.1 Dam
YearFirst dateLast date
18701870-01-151870-12-31
18801880-01-251880-11-10
18811881-01-141881-11-22
18821882-03-051882-12-11
18831883-02-021883-12-25
18841884-01-271884-12-15
18851885-01-121885-12-26
18861886-01-281886-12-13
18871887-01-211887-12-29
18881888-02-101888-12-20
18891889-01-041889-12-11
18901890-01-041890-12-15
18911891-01-111891-11-28
18921892-01-111892-12-31
18931893-01-011893-12-30
18941894-01-141894-12-16
18951895-01-161895-12-30
18961896-01-261896-11-27
18971897-01-101897-12-20
18981898-01-131898-12-31
18991899-01-121899-11-07
19001900-01-111900-12-06
19011901-01-021901-11-18
19021902-01-011902-12-12
19031903-01-051903-12-07
19041904-01-031904-12-19
19051905-01-301905-12-16
19061906-01-011906-12-25
19071907-01-271907-12-28
19081908-01-301908-12-18
19091909-01-061909-12-24
19101910-01-121910-12-19
19111911-01-121911-12-02
19121912-01-061912-12-13
19131913-03-071913-11-13
19141914-01-201914-12-31
19151915-01-091915-12-18
19161916-01-291916-12-14
19171917-01-231917-12-09
19181918-01-121918-12-28
19191919-01-051919-12-29
19441944-01-021944-10-17
19451945-01-131945-12-28
19511951-01-171951-12-21
19521952-01-071952-12-29
19531953-01-061953-11-27
19541954-01-041954-12-17
19551955-01-241955-12-20
19561956-01-261956-12-05
19571957-01-231957-12-31
19581958-01-231958-12-19
19591959-01-021959-12-21
19601960-01-041960-12-20
19611961-01-031961-12-27
19621962-01-021962-12-19
19631963-01-041963-12-31
19671967-01-051967-11-16
19691969-01-021969-12-23
19701970-01-121970-12-30
19711971-01-201971-12-08
19721972-01-131972-12-26
19741974-01-111974-10-23
19771977-01-271977-11-30

Every Fixed Threshold

Fixed thresholds at Botany No.1 Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain6354189011
25 mm (0.98 in): Days with 25 mm or more rain632518904
50 mm (1.97 in): Days with 50 mm or more rain611119632
100 mm (3.94 in): Days with 100 mm or more rain33419001
200 mm (7.87 in): Days with 200 mm or more rain4118891

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1870.

Download the Data

  • Data for Botany No.1 Dam 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).