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

Nepean Dam Threshold Days by Year

4 fixed thresholds counted per year at Nepean Dam (ASN00068047): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Nepean Dam Thresholds

  • Nepean Dam: days with 10 mm (0.39 in) or more of precipitation in 6 years, most in 1969 with 29.
  • Nepean Dam: days with 25 mm (0.98 in) or more of precipitation in 6 years, most in 1969 with 11.
  • Nepean Dam: days with 50 mm (1.97 in) or more of precipitation in 5 years, most in 1969 with 4.
  • Nepean Dam: days with 100 mm (3.94 in) or more of precipitation in 2 years, most in 1927 with 2.
  • 4 fixed thresholds have at least one qualifying day at Nepean Dam.
6 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Nepean Dam Days per year at Nepean Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 29 in 1969. 01020301927: 191928: 261930: 191968: 151969: 291970: 19192719281930196819691970
Days per year at Nepean Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 29 in 1969.
Days with 10 mm (0.39 in) or more of precipitation per year at Nepean Dam
YearDaysDecade average
19271922.5
19282622.5
19301919
19681522
19692922
19701919
First to last qualifying date each year at Nepean Dam For each year, a bar from the first to the last day at Nepean Dam meeting 10 mm (0.39 in). 1927: 6 January 1927 to 26 November 19271928: 6 January 1928 to 15 October 19281930: 14 March 1930 to 30 December 19301968: 5 January 1968 to 17 December 19681969: 3 January 1969 to 17 November 19691970: 11 January 1970 to 9 December 1970192719281930196819691970JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Nepean Dam meeting 10 mm (0.39 in).
First to last qualifying date each year at Nepean Dam
YearFirst dateLast date
19271927-01-061927-11-26
19281928-01-061928-10-15
19301930-03-141930-12-30
19681968-01-051968-12-17
19691969-01-031969-11-17
19701970-01-111970-12-09

Every Fixed Threshold

Fixed thresholds at Nepean Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain629196919
25 mm (0.98 in): Days with 25 mm or more rain61119694
50 mm (1.97 in): Days with 50 mm or more rain5419691
100 mm (3.94 in): Days with 100 mm or more rain2219272

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1927.

Download the Data

  • Data for Nepean 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).