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Built 2026-10-18 (18 October 2026)

Chatswood Water Supply Threshold Days by Year

5 fixed thresholds counted per year at Chatswood Water Supply (ASN00066012): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chatswood Water Supply Thresholds

  • Chatswood Water Supply: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 1950 with 57.
  • Chatswood Water Supply: days with 25 mm (0.98 in) or more of precipitation in 54 years, most in 1950 with 28.
  • Chatswood Water Supply: days with 50 mm (1.97 in) or more of precipitation in 53 years, most in 1950 with 10.
  • Chatswood Water Supply: days with 100 mm (3.94 in) or more of precipitation in 28 years, most in 1949 with 3.
  • 5 fixed thresholds have at least one qualifying day at Chatswood Water Supply.
54 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Chatswood Water Supply Days per year at Chatswood Water Supply with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1950. 02040601894: 251895: 261896: 281897: 301898: 301899: 391900: 371901: 241902: 231903: 341904: 321905: 251906: 211907: 261909: 241910: 301911: 341912: 361913: 341914: 341915: 271916: 301917: 351918: 281919: 361920: 281921: 341922: 271923: 281924: 311944: 211945: 291946: 221947: 351948: 241949: 441950: 571951: 381952: 411953: 251954: 321955: 441956: 381957: 191958: 341959: 371960: 371961: 311962: 321963: 521966: 301967: 301968: 151969: 37189419001906191319191944195019561962
Days per year at Chatswood Water Supply with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 57 in 1950.
Days with 10 mm (0.39 in) or more of precipitation per year at Chatswood Water Supply
YearDaysDecade average
18942529.7
18952629.7
18962829.7
18973029.7
18983029.7
18993929.7
19003727.3
19012427.3
19022327.3
19033427.3
19043227.3
19052527.3
19062127.3
19072627.3
19092427.3
19103032.4
19113432.4
19123632.4
19133432.4
19143432.4
19152732.4
19163032.4
19173532.4
19182832.4
19193632.4
19202829.6
19213429.6
19222729.6
19232829.6
19243129.6
19442129.2
19452929.2
19462229.2
19473529.2
19482429.2
19494429.2
19505736.5
19513836.5
19524136.5
19532536.5
19543236.5
19554436.5
19563836.5
19571936.5
19583436.5
19593736.5
19603733
19613133
19623233
19635233
19663033
19673033
19681533
19693733
First to last qualifying date each year at Chatswood Water Supply For each year, a bar from the first to the last day at Chatswood Water Supply meeting 10 mm (0.39 in). 1894: 27 January 1894 to 29 December 18941895: 4 January 1895 to 30 December 18951896: 20 January 1896 to 7 December 18961897: 5 January 1897 to 21 December 18971898: 13 January 1898 to 25 December 18981899: 11 January 1899 to 18 November 18991900: 25 January 1900 to 6 December 19001901: 12 January 1901 to 11 October 19011902: 6 January 1902 to 18 December 19021903: 5 January 1903 to 24 December 19031904: 3 January 1904 to 19 December 19041905: 29 January 1905 to 16 December 19051906: 14 January 1906 to 25 December 19061907: 27 January 1907 to 28 December 19071909: 18 January 1909 to 24 December 19091910: 12 January 1910 to 19 December 19101911: 12 January 1911 to 4 December 19111912: 6 January 1912 to 13 December 19121913: 4 January 1913 to 12 November 19131914: 8 February 1914 to 31 December 19141915: 9 January 1915 to 18 December 19151916: 29 January 1916 to 14 December 19161917: 23 January 1917 to 27 November 19171918: 11 January 1918 to 29 November 19181919: 25 February 1919 to 29 December 19191920: 4 January 1920 to 13 December 19201921: 4 January 1921 to 31 December 19211922: 3 January 1922 to 7 December 19221923: 26 January 1923 to 27 December 19231924: 21 January 1924 to 27 December 19241944: 2 January 1944 to 7 December 19441945: 12 January 1945 to 28 December 19451946: 21 January 1946 to 18 November 19461947: 17 January 1947 to 25 December 19471948: 2 January 1948 to 31 December 19481949: 1 January 1949 to 20 December 19491950: 8 January 1950 to 22 November 19501951: 8 January 1951 to 13 October 19511952: 7 January 1952 to 29 November 19521953: 6 January 1953 to 27 November 19531954: 1 January 1954 to 17 December 19541955: 22 January 1955 to 29 December 19551956: 12 January 1956 to 3 December 19561957: 23 January 1957 to 31 December 19571958: 1 January 1958 to 19 December 19581959: 22 January 1959 to 8 December 19591960: 5 January 1960 to 20 December 19601961: 3 January 1961 to 27 December 19611962: 8 January 1962 to 25 December 19621963: 15 January 1963 to 30 December 19631966: 17 January 1966 to 7 December 19661967: 26 January 1967 to 16 November 19671968: 5 January 1968 to 26 December 19681969: 2 January 1969 to 13 December 196918941901190919161923194919561963JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Chatswood Water Supply meeting 10 mm (0.39 in).
First to last qualifying date each year at Chatswood Water Supply
YearFirst dateLast date
18941894-01-271894-12-29
18951895-01-041895-12-30
18961896-01-201896-12-07
18971897-01-051897-12-21
18981898-01-131898-12-25
18991899-01-111899-11-18
19001900-01-251900-12-06
19011901-01-121901-10-11
19021902-01-061902-12-18
19031903-01-051903-12-24
19041904-01-031904-12-19
19051905-01-291905-12-16
19061906-01-141906-12-25
19071907-01-271907-12-28
19091909-01-181909-12-24
19101910-01-121910-12-19
19111911-01-121911-12-04
19121912-01-061912-12-13
19131913-01-041913-11-12
19141914-02-081914-12-31
19151915-01-091915-12-18
19161916-01-291916-12-14
19171917-01-231917-11-27
19181918-01-111918-11-29
19191919-02-251919-12-29
19201920-01-041920-12-13
19211921-01-041921-12-31
19221922-01-031922-12-07
19231923-01-261923-12-27
19241924-01-211924-12-27
19441944-01-021944-12-07
19451945-01-121945-12-28
19461946-01-211946-11-18
19471947-01-171947-12-25
19481948-01-021948-12-31
19491949-01-011949-12-20
19501950-01-081950-11-22
19511951-01-081951-10-13
19521952-01-071952-11-29
19531953-01-061953-11-27
19541954-01-011954-12-17
19551955-01-221955-12-29
19561956-01-121956-12-03
19571957-01-231957-12-31
19581958-01-011958-12-19
19591959-01-221959-12-08
19601960-01-051960-12-20
19611961-01-031961-12-27
19621962-01-081962-12-25
19631963-01-151963-12-30
19661966-01-171966-12-07
19671967-01-261967-11-16
19681968-01-051968-12-26
19691969-01-021969-12-13

Every Fixed Threshold

Fixed thresholds at Chatswood Water Supply
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5457195037
25 mm (0.98 in): Days with 25 mm or more rain5428195015
50 mm (1.97 in): Days with 50 mm or more rain531019503
100 mm (3.94 in): Days with 100 mm or more rain28319492
200 mm (7.87 in): Days with 200 mm or more rain1119111

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

  • Data for Chatswood Water Supply 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).