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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Mosman Water Supply Threshold Days by Year

4 fixed thresholds counted per year at Mosman Water Supply (ASN00066041): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mosman Water Supply Thresholds

  • Mosman Water Supply: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 1950 with 58.
  • Mosman Water Supply: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1963 with 30.
  • Mosman Water Supply: days with 50 mm (1.97 in) or more of precipitation in 37 years, most in 1950 with 12.
  • Mosman Water Supply: days with 100 mm (3.94 in) or more of precipitation in 23 years, most in 1961 with 4.
  • 4 fixed thresholds have at least one qualifying day at Mosman Water Supply.
37 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Mosman Water Supply Days per year at Mosman Water Supply with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1950. 02040601905: 221906: 221908: 361909: 351910: 301911: 381912: 391913: 421914: 391915: 301916: 341919: 331920: 321921: 351922: 301923: 261924: 301944: 231945: 311946: 221947: 351948: 311949: 431950: 581951: 411952: 331953: 221954: 351955: 461956: 421957: 171958: 371959: 401960: 351961: 321962: 341963: 421905191019141920192419471951195519591963
Days per year at Mosman Water Supply with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1950.
Days with 10 mm (0.39 in) or more of precipitation per year at Mosman Water Supply
YearDaysDecade average
19052228.8
19062228.8
19083628.8
19093528.8
19103035.6
19113835.6
19123935.6
19134235.6
19143935.6
19153035.6
19163435.6
19193335.6
19203230.6
19213530.6
19223030.6
19232630.6
19243030.6
19442330.8
19453130.8
19462230.8
19473530.8
19483130.8
19494330.8
19505837.1
19514137.1
19523337.1
19532237.1
19543537.1
19554637.1
19564237.1
19571737.1
19583737.1
19594037.1
19603535.8
19613235.8
19623435.8
19634235.8
First to last qualifying date each year at Mosman Water Supply For each year, a bar from the first to the last day at Mosman Water Supply meeting 10 mm (0.39 in). 1905: 30 January 1905 to 16 December 19051906: 14 January 1906 to 25 December 19061908: 30 January 1908 to 22 December 19081909: 6 January 1909 to 24 December 19091910: 12 January 1910 to 19 December 19101911: 12 January 1911 to 5 December 19111912: 6 January 1912 to 13 December 19121913: 4 January 1913 to 13 November 19131914: 27 February 1914 to 31 December 19141915: 9 January 1915 to 18 December 19151916: 29 January 1916 to 14 December 19161919: 5 January 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: 25 January 1923 to 27 December 19231924: 21 January 1924 to 28 December 19241944: 1 January 1944 to 17 October 19441945: 12 January 1945 to 28 December 19451946: 9 February 1946 to 19 November 19461947: 17 January 1947 to 25 December 19471948: 2 January 1948 to 31 December 19481949: 1 January 1949 to 20 December 19491950: 2 January 1950 to 9 December 19501951: 14 January 1951 to 21 December 19511952: 7 January 1952 to 27 December 19521953: 6 January 1953 to 27 November 19531954: 1 January 1954 to 17 December 19541955: 23 January 1955 to 28 December 19551956: 12 January 1956 to 6 November 19561957: 23 January 1957 to 31 December 19571958: 1 January 1958 to 19 December 19581959: 4 January 1959 to 19 December 19591960: 5 January 1960 to 20 December 19601961: 3 January 1961 to 27 December 19611962: 2 January 1962 to 25 December 19621963: 4 January 1963 to 30 December 196319051911191619231947195219571962JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Mosman Water Supply meeting 10 mm (0.39 in).
First to last qualifying date each year at Mosman Water Supply
YearFirst dateLast date
19051905-01-301905-12-16
19061906-01-141906-12-25
19081908-01-301908-12-22
19091909-01-061909-12-24
19101910-01-121910-12-19
19111911-01-121911-12-05
19121912-01-061912-12-13
19131913-01-041913-11-13
19141914-02-271914-12-31
19151915-01-091915-12-18
19161916-01-291916-12-14
19191919-01-051919-12-29
19201920-01-041920-12-13
19211921-01-041921-12-31
19221922-01-031922-12-07
19231923-01-251923-12-27
19241924-01-211924-12-28
19441944-01-011944-10-17
19451945-01-121945-12-28
19461946-02-091946-11-19
19471947-01-171947-12-25
19481948-01-021948-12-31
19491949-01-011949-12-20
19501950-01-021950-12-09
19511951-01-141951-12-21
19521952-01-071952-12-27
19531953-01-061953-11-27
19541954-01-011954-12-17
19551955-01-231955-12-28
19561956-01-121956-11-06
19571957-01-231957-12-31
19581958-01-011958-12-19
19591959-01-041959-12-19
19601960-01-051960-12-20
19611961-01-031961-12-27
19621962-01-021962-12-25
19631963-01-041963-12-30

Every Fixed Threshold

Fixed thresholds at Mosman Water Supply
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain3758195042
25 mm (0.98 in): Days with 25 mm or more rain3730196330
50 mm (1.97 in): Days with 50 mm or more rain3712195011
100 mm (3.94 in): Days with 100 mm or more rain23419611

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1905.

Download the Data

  • Data for Mosman 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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