Daily records
Page built 2026-10-18
Data as of 2026-10-16
Search
Built 2026-10-18 (18 October 2026)

Merrimu Reservoir Threshold Days by Year

3 fixed thresholds counted per year at Merrimu Reservoir (ASN00087161): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Merrimu Reservoir Thresholds

  • Merrimu Reservoir: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1978 with 22.
  • Merrimu Reservoir: days with 25 mm (0.98 in) or more of precipitation in 48 years, most in 1995 with 7.
  • Merrimu Reservoir: days with 50 mm (1.97 in) or more of precipitation in 15 years, most in 1983 with 3.
  • 3 fixed thresholds have at least one qualifying day at Merrimu Reservoir.
53 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Merrimu Reservoir Days per year at Merrimu Reservoir with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 22 in 1978. 01020301974: 131975: 131976: 131977: 81978: 221979: 71980: 101981: 151982: 61983: 131984: 81985: 141986: 91987: 171988: 101989: 101990: 141991: 141992: 191993: 161994: 51995: 161996: 121997: 71998: 121999: 102000: 172001: 112002: 72003: 112004: 142005: 112006: 102007: 122008: 52009: 92010: 212011: 162012: 112013: 172014: 92015: 112016: 82017: 132018: 122019: 132020: 202021: 192022: 132023: 122024: 102025: 112026: 6197419801986199219982004201020162022
Days per year at Merrimu Reservoir with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 22 in 1978.
Days with 10 mm (0.39 in) or more of precipitation per year at Merrimu Reservoir
YearDaysDecade average
19741312.7
19751312.7
19761312.7
1977812.7
19782212.7
1979712.7
19801011.2
19811511.2
1982611.2
19831311.2
1984811.2
19851411.2
1986911.2
19871711.2
19881011.2
19891011.2
19901412.5
19911412.5
19921912.5
19931612.5
1994512.5
19951612.5
19961212.5
1997712.5
19981212.5
19991012.5
20001710.7
20011110.7
2002710.7
20031110.7
20041410.7
20051110.7
20061010.7
20071210.7
2008510.7
2009910.7
20102113.1
20111613.1
20121113.1
20131713.1
2014913.1
20151113.1
2016813.1
20171313.1
20181213.1
20191313.1
20202013
20211913
20221313
20231213
20241013
20251113
2026613
First to last qualifying date each year at Merrimu Reservoir For each year, a bar from the first to the last day at Merrimu Reservoir meeting 10 mm (0.39 in). 1974: 14 January 1974 to 18 November 19741975: 3 August 1975 to 4 December 19751976: 9 February 1976 to 16 October 19761977: 15 January 1977 to 28 November 19771978: 6 January 1978 to 26 December 19781979: 17 January 1979 to 12 November 19791980: 12 January 1980 to 29 December 19801981: 9 January 1981 to 13 December 19811982: 25 January 1982 to 8 December 19821983: 22 March 1983 to 30 November 19831984: 26 January 1984 to 13 November 19841985: 3 January 1985 to 10 December 19851986: 2 July 1986 to 17 December 19861987: 3 January 1987 to 28 December 19871988: 1 January 1988 to 18 December 19881989: 4 January 1989 to 25 October 19891990: 1 February 1990 to 20 December 19901991: 5 January 1991 to 31 December 19911992: 1 January 1992 to 22 December 19921993: 17 January 1993 to 28 December 19931994: 11 February 1994 to 8 June 19941995: 6 January 1995 to 22 November 19951996: 1 January 1996 to 6 October 19961997: 23 January 1997 to 14 November 19971998: 26 January 1998 to 27 December 19981999: 13 February 1999 to 28 December 19992000: 27 January 2000 to 23 December 20002001: 25 January 2001 to 7 December 20012002: 22 January 2002 to 2 August 20022003: 21 February 2003 to 3 December 20032004: 30 January 2004 to 13 December 20042005: 27 January 2005 to 7 December 20052006: 11 January 2006 to 13 November 20062007: 24 March 2007 to 22 December 20072008: 17 May 2008 to 14 December 20082009: 15 March 2009 to 9 December 20092010: 1 January 2010 to 9 December 20102011: 11 January 2011 to 27 November 20112012: 12 February 2012 to 29 September 20122013: 1 February 2013 to 24 November 20132014: 9 April 2014 to 7 December 20142015: 10 January 2015 to 26 December 20152016: 22 April 2016 to 3 October 20162017: 20 January 2017 to 8 December 20172018: 30 January 2018 to 15 December 20182019: 2 May 2019 to 2 November 20192020: 6 January 2020 to 23 December 20202021: 3 January 2021 to 9 December 20212022: 29 January 2022 to 23 December 20222023: 3 January 2023 to 27 December 20232024: 3 January 2024 to 1 December 20242025: 7 January 2025 to 22 December 20252026: 25 February 2026 to 25 August 202619741981198819952002200920162023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Merrimu Reservoir meeting 10 mm (0.39 in).
First to last qualifying date each year at Merrimu Reservoir
YearFirst dateLast date
19741974-01-141974-11-18
19751975-08-031975-12-04
19761976-02-091976-10-16
19771977-01-151977-11-28
19781978-01-061978-12-26
19791979-01-171979-11-12
19801980-01-121980-12-29
19811981-01-091981-12-13
19821982-01-251982-12-08
19831983-03-221983-11-30
19841984-01-261984-11-13
19851985-01-031985-12-10
19861986-07-021986-12-17
19871987-01-031987-12-28
19881988-01-011988-12-18
19891989-01-041989-10-25
19901990-02-011990-12-20
19911991-01-051991-12-31
19921992-01-011992-12-22
19931993-01-171993-12-28
19941994-02-111994-06-08
19951995-01-061995-11-22
19961996-01-011996-10-06
19971997-01-231997-11-14
19981998-01-261998-12-27
19991999-02-131999-12-28
20002000-01-272000-12-23
20012001-01-252001-12-07
20022002-01-222002-08-02
20032003-02-212003-12-03
20042004-01-302004-12-13
20052005-01-272005-12-07
20062006-01-112006-11-13
20072007-03-242007-12-22
20082008-05-172008-12-14
20092009-03-152009-12-09
20102010-01-012010-12-09
20112011-01-112011-11-27
20122012-02-122012-09-29
20132013-02-012013-11-24
20142014-04-092014-12-07
20152015-01-102015-12-26
20162016-04-222016-10-03
20172017-01-202017-12-08
20182018-01-302018-12-15
20192019-05-022019-11-02
20202020-01-062020-12-23
20212021-01-032021-12-09
20222022-01-292022-12-23
20232023-01-032023-12-27
20242024-01-032024-12-01
20252025-01-072025-12-22
20262026-02-252026-08-25

Every Fixed Threshold

Fixed thresholds at Merrimu Reservoir
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain532219786
25 mm (0.98 in): Days with 25 mm or more rain48719951
50 mm (1.97 in): Days with 50 mm or more rain15319831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1974.

Download the Data

  • Data for Merrimu Reservoir 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 (2026-10-16).