Daily records
Page built 2026-10-15
Data as of 2026-10-13
Search
Built 2026-10-15 (15 October 2026)

Merrimu Reservoir Weather Records (ASN00087161)

Record envelope, standing records and threshold days for Merrimu Reservoir (ASN00087161), Australia, with 53 years of record.

Key Facts for Merrimu Reservoir

  • Merrimu Reservoir (ASN00087161) is a weather station in Australia at -37.63 latitude and 144.50 longitude, 185 m (607 ft) above sea level.
  • The station reports from 1974 to 2026, 53 years of record.
  • 0 records set at Merrimu Reservoir still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Merrimu Reservoir set a daily record precipitation of 15.4 mm (0.6 in) on 25 August 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Australia, -37.63 latitude, 144.50 longitude.
  • Elevation: 185 m (607 ft).
  • Period of record: 1974 to 2026, 53 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Merrimu Reservoir, with 2026 drawn through them The band shows the record high and record low for each calendar day at Merrimu Reservoir. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Merrimu Reservoir. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Merrimu Reservoir, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jann/an/an/an/a
Febn/an/an/an/a
Marn/an/an/an/a
Aprn/an/an/an/a
Mayn/an/an/an/a
Junn/an/an/an/a
Juln/an/an/an/a
Augn/an/an/an/a
Sepn/an/an/an/a
Octn/an/an/an/a
Novn/an/an/an/a
Decn/an/an/an/a

Which Years Hold Standing Records

0 standing records
Standing records at Merrimu Reservoir by the year they were set 0 records at Merrimu Reservoir still stand. 00000000000
0 records at Merrimu Reservoir still stand.
Standing records at Merrimu Reservoir by the year they were set
Year setStanding records

Wettest Day of Each Month

Oct: 82.2 mm (3.2 in)
Record daily precipitation for each month at Merrimu Reservoir The wettest day on record for each calendar month at Merrimu Reservoir. The most was 82.2 mm (3.2 in) on 23 October 1995. 0255075100 Jan: 66.0 mm (2.6 in), 30 January 2018 Jan Feb: 80.0 mm (3.1 in), 3 February 2005 Feb Mar: 60.2 mm (2.4 in), 22 March 1983 Mar Apr: 68.4 mm (2.7 in), 21 April 1990 Apr May: 43.8 mm (1.7 in), 4 May 2021 May Jun: 29.6 mm (1.2 in), 8 June 1994 Jun Jul: 34.6 mm (1.4 in), 6 July 2016 Jul Aug: 29.0 mm (1.1 in), 7 August 1978 Aug Sep: 52.0 mm (2.0 in), 15 September 1993 Sep Oct: 82.2 mm (3.2 in), 23 October 1995 Oct Nov: 74.0 mm (2.9 in), 19 November 1978 Nov Dec: 72.6 mm (2.9 in), 2 December 1987 Dec
The wettest day on record for each calendar month at Merrimu Reservoir. The most was 82.2 mm (3.2 in) on 23 October 1995.
Record daily precipitation for each month at Merrimu Reservoir
MonthRecord daily precipitation (mm)Date
Jan66.0 mm (2.6 in)30 January 2018
Feb80.0 mm (3.1 in)3 February 2005
Mar60.2 mm (2.4 in)22 March 1983
Apr68.4 mm (2.7 in)21 April 1990
May43.8 mm (1.7 in)4 May 2021
Jun29.6 mm (1.2 in)8 June 1994
Jul34.6 mm (1.4 in)6 July 2016
Aug29.0 mm (1.1 in)7 August 1978
Sep52.0 mm (2.0 in)15 September 1993
Oct82.2 mm (3.2 in)23 October 1995
Nov74.0 mm (2.9 in)19 November 1978
Dec72.6 mm (2.9 in)2 December 1987

Latest Records

20
Latest records at Merrimu Reservoir
DateStationRecordValueBeat old record byOld record stoodSignificance
25 August 2026Merrimu Reservoir, AUdaily rain (Provisional)15.4 mm (0.6 in)9.2 mm (0.36 in)16 years20 of 100 (Routine)
10 August 2026Merrimu Reservoir, AUdaily rain26.6 mm (1.0 in)19.0 mm (0.7 in)13 years49 of 100 (Notable)
12 July 2026Merrimu Reservoir, AUdaily rain11.6 mm (0.5 in)6.8 mm (0.27 in)12 years20 of 100 (Routine)
1 July 2026Merrimu Reservoir, AUdaily rain7.8 mm (0.31 in)1.0 mm (0.04 in)48 years20 of 100 (Routine)
27 March 2026Merrimu Reservoir, AUdaily rain18.6 mm (0.7 in)3.2 mm (0.13 in)24 years17 of 100 (Routine)
25 February 2026Merrimu Reservoir, AUdaily rain13.4 mm (0.5 in)9.6 mm (0.38 in)47 years20 of 100 (Routine)
29 November 2025Merrimu Reservoir, AUdaily rain20.4 mm (0.8 in)7.9 mm (0.31 in)44 years20 of 100 (Routine)
3 November 2025Merrimu Reservoir, AUdaily rain28.4 mm (1.1 in)20.0 mm (0.8 in)14 years33 of 100 (Routine)
23 July 2025Merrimu Reservoir, AUdaily rain6.4 mm (0.25 in)0.2 mm (0.01 in)47 years19 of 100 (Routine)
9 June 2025Merrimu Reservoir, AUdaily rain16.2 mm (0.6 in)1.9 mm (0.07 in)34 years19 of 100 (Routine)
27 April 2025Merrimu Reservoir, AUdaily rain7.4 mm (0.29 in)1.0 mm (0.04 in)30 years15 of 100 (Routine)
7 January 2025Merrimu Reservoir, AUdaily rain14.6 mm (0.6 in)2.6 mm (0.10 in)30 years16 of 100 (Routine)
1 December 2024Merrimu Reservoir, AUdaily rain17.2 mm (0.7 in)6.6 mm (0.26 in)37 years20 of 100 (Routine)
19 October 2024Merrimu Reservoir, AUdaily rain19.4 mm (0.8 in)7.6 mm (0.30 in)24 years20 of 100 (Routine)
12 September 2024Merrimu Reservoir, AUdaily rain14.8 mm (0.6 in)3.0 mm (0.12 in)31 years20 of 100 (Routine)
2 April 2024Merrimu Reservoir, AUdaily rain48.6 mm (1.9 in)23.8 mm (0.9 in)4 years41 of 100 (Notable)
18 January 2024Merrimu Reservoir, AUdaily rain11.4 mm (0.4 in)8.0 mm (0.31 in)28 years20 of 100 (Routine)
9 January 2024Merrimu Reservoir, AUdaily rain11.2 mm (0.4 in)1.2 mm (0.05 in)42 years18 of 100 (Routine)
8 January 2024Merrimu Reservoir, AUdaily rain24.8 mm (1.0 in)15.6 mm (0.6 in)24 years20 of 100 (Routine)
25 December 2023Merrimu Reservoir, AUdaily rain43.6 mm (1.7 in)38.2 mm (1.5 in)12 years48 of 100 (Notable)

Extremes by Year

1974 to 2026
Yearly extremes at Merrimu Reservoir: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)82.2 mm (3.2 in)199541.2 mm (1.6 in)53
Wettest five days (Rx5day)144.2 mm (5.7 in)201160.0 mm (2.4 in)53
Longest dry spell (CDD)38 days197623 days53

Wettest day (Rx1day)

Wettest day (Rx1day) at Merrimu Reservoir by year The wettest day of the year at Merrimu Reservoir, 1974 to 2026. The record is 82.2 mm (3.2 in) in 1995, marked on the chart; the median year is 41.2 mm (1.6 in). 2040608010019801990200020102020Record: 82.2 mm (3.2 in) in 1995
The wettest day of the year at Merrimu Reservoir, 1974 to 2026. The record is 82.2 mm (3.2 in) in 1995, marked on the chart; the median year is 41.2 mm (1.6 in).
Wettest day (Rx1day) at Merrimu Reservoir by year
YearWettest day (Rx1day)
197441.7 mm (1.6 in)
197527.4 mm (1.1 in)
197645.8 mm (1.8 in)
197751.6 mm (2.0 in)
197874.0 mm (2.9 in)
197926.2 mm (1.0 in)
198035.0 mm (1.4 in)
198139.4 mm (1.6 in)
198222.0 mm (0.9 in)
198375.6 mm (3.0 in)
198433.0 mm (1.3 in)
198540.0 mm (1.6 in)
198633.8 mm (1.3 in)
198772.6 mm (2.9 in)
198852.6 mm (2.1 in)
198928.8 mm (1.1 in)
199068.4 mm (2.7 in)
199141.2 mm (1.6 in)
199240.4 mm (1.6 in)
199352.0 mm (2.0 in)
199449.0 mm (1.9 in)
199582.2 mm (3.2 in)
199639.8 mm (1.6 in)
199736.4 mm (1.4 in)
199860.6 mm (2.4 in)
199958.2 mm (2.3 in)
200051.6 mm (2.0 in)
200143.2 mm (1.7 in)
200222.6 mm (0.9 in)
200332.8 mm (1.3 in)
200437.6 mm (1.5 in)
200580.0 mm (3.1 in)
200621.0 mm (0.8 in)
200724.6 mm (1.0 in)
200847.6 mm (1.9 in)
200941.2 mm (1.6 in)
201063.0 mm (2.5 in)
201176.0 mm (3.0 in)
201228.8 mm (1.1 in)
201325.6 mm (1.0 in)
201426.4 mm (1.0 in)
201547.6 mm (1.9 in)
201634.6 mm (1.4 in)
201746.0 mm (1.8 in)
201866.0 mm (2.6 in)
201923.8 mm (0.9 in)
202035.2 mm (1.4 in)
202143.8 mm (1.7 in)
202246.0 mm (1.8 in)
202343.6 mm (1.7 in)
202448.6 mm (1.9 in)
202528.4 mm (1.1 in)
202626.6 mm (1.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Merrimu Reservoir by year The wettest five days of the year at Merrimu Reservoir, 1974 to 2026. The record is 144.2 mm (5.7 in) in 2011, marked on the chart; the median year is 60.0 mm (2.4 in). 05010015019801990200020102020Record: 144.2 mm (5.7 in) in 2011
The wettest five days of the year at Merrimu Reservoir, 1974 to 2026. The record is 144.2 mm (5.7 in) in 2011, marked on the chart; the median year is 60.0 mm (2.4 in).
Wettest five days (Rx5day) at Merrimu Reservoir by year
YearWettest five days (Rx5day)
197486.2 mm (3.4 in)
197547.9 mm (1.9 in)
197690.6 mm (3.6 in)
197760.0 mm (2.4 in)
197881.8 mm (3.2 in)
197943.0 mm (1.7 in)
198037.2 mm (1.5 in)
198158.4 mm (2.3 in)
198237.4 mm (1.5 in)
1983138.1 mm (5.4 in)
198447.6 mm (1.9 in)
198574.2 mm (2.9 in)
198643.6 mm (1.7 in)
1987101.4 mm (4.0 in)
1988106.1 mm (4.2 in)
198942.4 mm (1.7 in)
199097.2 mm (3.8 in)
199172.3 mm (2.8 in)
199266.6 mm (2.6 in)
199381.6 mm (3.2 in)
199465.2 mm (2.6 in)
1995127.0 mm (5.0 in)
199642.6 mm (1.7 in)
199749.4 mm (1.9 in)
1998116.2 mm (4.6 in)
1999114.6 mm (4.5 in)
200090.4 mm (3.6 in)
200191.0 mm (3.6 in)
200228.8 mm (1.1 in)
200348.6 mm (1.9 in)
200454.0 mm (2.1 in)
2005130.2 mm (5.1 in)
200628.6 mm (1.1 in)
200738.2 mm (1.5 in)
200867.0 mm (2.6 in)
200961.0 mm (2.4 in)
2010135.8 mm (5.3 in)
2011144.2 mm (5.7 in)
201253.4 mm (2.1 in)
201341.6 mm (1.6 in)
201454.8 mm (2.2 in)
201547.6 mm (1.9 in)
201665.4 mm (2.6 in)
201754.0 mm (2.1 in)
201872.8 mm (2.9 in)
201946.4 mm (1.8 in)
202058.6 mm (2.3 in)
202168.8 mm (2.7 in)
202255.8 mm (2.2 in)
202382.8 mm (3.3 in)
202454.4 mm (2.1 in)
202535.6 mm (1.4 in)
202632.8 mm (1.3 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Merrimu Reservoir by year The longest dry spell of the year at Merrimu Reservoir, 1974 to 2026. The record is 38 days in 1976, marked on the chart; the median year is 23 days. 1020304019801990200020102020Record: 38 days in 1976
The longest dry spell of the year at Merrimu Reservoir, 1974 to 2026. The record is 38 days in 1976, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Merrimu Reservoir by year
YearLongest dry spell (CDD)
197420 days
197519 days
197638 days
197725 days
197819 days
197923 days
198027 days
198126 days
198221 days
198326 days
198420 days
198527 days
198630 days
198725 days
198826 days
198920 days
199031 days
199121 days
199226 days
199317 days
199426 days
199513 days
199616 days
199725 days
199816 days
199919 days
200021 days
200131 days
200221 days
200318 days
200424 days
200521 days
200625 days
200723 days
200822 days
200933 days
201016 days
201115 days
201228 days
201326 days
201423 days
201529 days
201620 days
201720 days
201828 days
201928 days
202016 days
202123 days
202219 days
202324 days
202429 days
202527 days
202635 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

52 years, 1974 to 2025

A day with at least 41.8 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 97.4 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Merrimu Reservoir: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years41.8 mm (1.6 in)
5 years56.9 mm (2.2 in)
10 years66.8 mm (2.6 in)
25 years79.2 mm (3.1 in)
50 years88.3 mm (3.5 in)
100 years97.4 mm (3.8 in)Longer than the 52 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 52 years of values from 1974 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 82.2 mm (3.2 in) in 1995; 80.0 mm (3.1 in) in 2005; 76.0 mm (3.0 in) in 2011.

Download the Data

  • Data for Merrimu Reservoir standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).