Roto (Merimerriwa Tank) Weather Records (ASN00049027)

Record envelope, standing records and threshold days for Roto (Merimerriwa Tank) (ASN00049027), Australia, with 76 years of record.

Key Facts for Roto (Merimerriwa Tank)

Roto (Merimerriwa Tank) (ASN00049027) is a weather station in Australia at -32.78 latitude and 145.55 longitude, n/a above sea level.
The station reports from 1891 to 1966, 76 years of record.
0 records set at Roto (Merimerriwa Tank) still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Roto (Merimerriwa Tank) set a daily record precipitation of 34.5 mm (1.4 in) on 16 March 1966.

About the Station

Location: Australia, -32.78 latitude, 145.55 longitude.
Elevation: n/a.
Period of record: 1891 to 1966, 76 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Roto (Merimerriwa Tank). 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 Roto (Merimerriwa Tank), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

0 standing records

0 records at Roto (Merimerriwa Tank) still stand.

Wettest Day of Each Month

Mar: 67.8 mm (2.7 in)

The wettest day on record for each calendar month at Roto (Merimerriwa Tank). The most was 67.8 mm (2.7 in) on 1 March 1906.

Record daily precipitation for each month at Roto (Merimerriwa Tank)
Month	Record daily precipitation (mm)	Date
Jan	63.2 mm (2.5 in)	4 January 1891
Feb	63.0 mm (2.5 in)	7 February 1917
Mar	67.8 mm (2.7 in)	1 March 1906
Apr	59.2 mm (2.3 in)	16 April 1908
May	45.7 mm (1.8 in)	22 May 1919
Jun	54.6 mm (2.1 in)	19 June 1897
Jul	39.6 mm (1.6 in)	12 July 1911
Aug	38.6 mm (1.5 in)	2 August 1907
Sep	44.5 mm (1.8 in)	23 September 1916
Oct	35.6 mm (1.4 in)	27 October 1913
Nov	45.2 mm (1.8 in)	26 November 1952
Dec	48.3 mm (1.9 in)	4 December 1965

Latest Records

Latest records at Roto (Merimerriwa Tank)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
16 March 1966	Roto (Merimerriwa Tank), AU	daily rain	34.5 mm (1.4 in)	26.9 mm (1.1 in)	69 years	54 of 100 (Notable)
15 March 1966	Roto (Merimerriwa Tank), AU	daily rain	24.9 mm (1.0 in)	12.2 mm (0.5 in)	64 years	20 of 100 (Routine)
7 December 1965	Roto (Merimerriwa Tank), AU	daily rain	36.8 mm (1.4 in)	30.4 mm (1.2 in)	69 years	67 of 100 (Major)
4 December 1965	Roto (Merimerriwa Tank), AU	monthly rain	48.3 mm (1.9 in)	15.0 mm (0.6 in)	0 years	38 of 100 (Notable)
1 December 1965	Roto (Merimerriwa Tank), AU	monthly rain	33.3 mm (1.3 in)	3.8 mm (0.15 in)	53 years	38 of 100 (Notable)
25 November 1965	Roto (Merimerriwa Tank), AU	daily rain	7.6 mm (0.30 in)	3.5 mm (0.14 in)	54 years	20 of 100 (Routine)
17 October 1965	Roto (Merimerriwa Tank), AU	daily rain	24.4 mm (1.0 in)	9.7 mm (0.38 in)	15 years	20 of 100 (Routine)
25 August 1965	Roto (Merimerriwa Tank), AU	daily rain	9.7 mm (0.38 in)	2.6 mm (0.10 in)	64 years	20 of 100 (Routine)
15 August 1965	Roto (Merimerriwa Tank), AU	daily rain	15.5 mm (0.6 in)	5.3 mm (0.21 in)	48 years	20 of 100 (Routine)
13 July 1965	Roto (Merimerriwa Tank), AU	daily rain	7.9 mm (0.31 in)	2.8 mm (0.11 in)	12 years	14 of 100 (Routine)
22 June 1965	Roto (Merimerriwa Tank), AU	daily rain	34.3 mm (1.4 in)	8.1 mm (0.32 in)	60 years	35 of 100 (Notable)
31 May 1965	Roto (Merimerriwa Tank), AU	daily rain	18.3 mm (0.7 in)	3.6 mm (0.14 in)	70 years	20 of 100 (Routine)
9 April 1965	Roto (Merimerriwa Tank), AU	daily rain	29.2 mm (1.1 in)	10.9 mm (0.4 in)	12 years	20 of 100 (Routine)
3 November 1964	Roto (Merimerriwa Tank), AU	daily rain	25.9 mm (1.0 in)	6.8 mm (0.27 in)	65 years	32 of 100 (Routine)
6 October 1964	Roto (Merimerriwa Tank), AU	daily rain	19.3 mm (0.8 in)	13.5 mm (0.5 in)	69 years	20 of 100 (Routine)
29 September 1964	Roto (Merimerriwa Tank), AU	daily rain	8.9 mm (0.35 in)	1.0 mm (0.04 in)	48 years	20 of 100 (Routine)
11 September 1964	Roto (Merimerriwa Tank), AU	daily rain	19.3 mm (0.8 in)	16.8 mm (0.7 in)	69 years	20 of 100 (Routine)
9 September 1964	Roto (Merimerriwa Tank), AU	daily rain	26.7 mm (1.1 in)	9.7 mm (0.38 in)	69 years	41 of 100 (Notable)
1 September 1964	Roto (Merimerriwa Tank), AU	daily rain	24.1 mm (0.9 in)	5.6 mm (0.22 in)	61 years	20 of 100 (Routine)
28 August 1964	Roto (Merimerriwa Tank), AU	daily rain	16.0 mm (0.6 in)	2.5 mm (0.10 in)	48 years	20 of 100 (Routine)

Extremes by Year

1891 to 1966

Yearly extremes at Roto (Merimerriwa Tank): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	67.8 mm (2.7 in)	1906	38.1 mm (1.5 in)	43
Wettest five days (Rx5day)	111.0 mm (4.4 in)	1906	52.3 mm (2.1 in)	43
Longest dry spell (CDD)	211 days	1919	56 days	43

Wettest day (Rx1day)

The wettest day of the year at Roto (Merimerriwa Tank), 1891 to 1966. The record is 67.8 mm (2.7 in) in 1906, marked on the chart; the median year is 38.1 mm (1.5 in).

Wettest day (Rx1day) at Roto (Merimerriwa Tank) by year
Year	Wettest day (Rx1day)
1891	63.2 mm (2.5 in)
1892	21.6 mm (0.9 in)
1893	38.1 mm (1.5 in)
1894	22.9 mm (0.9 in)
1895	25.4 mm (1.0 in)
1896	44.5 mm (1.8 in)
1897	54.6 mm (2.1 in)
1898	25.4 mm (1.0 in)
1899	33.5 mm (1.3 in)
1900	33.5 mm (1.3 in)
1901	25.4 mm (1.0 in)
1902	43.2 mm (1.7 in)
1903	20.1 mm (0.8 in)
1904	32.0 mm (1.3 in)
1905	49.5 mm (1.9 in)
1906	67.8 mm (2.7 in)
1907	38.6 mm (1.5 in)
1908	59.2 mm (2.3 in)
1909	35.6 mm (1.4 in)
1910	31.5 mm (1.2 in)
1911	40.6 mm (1.6 in)
1912	33.5 mm (1.3 in)
1913	40.6 mm (1.6 in)
1914	26.2 mm (1.0 in)
1915	21.1 mm (0.8 in)
1916	44.5 mm (1.8 in)
1917	63.0 mm (2.5 in)
1918	38.9 mm (1.5 in)
1919	45.7 mm (1.8 in)
1920	51.6 mm (2.0 in)
1949	44.2 mm (1.7 in)
1950	41.9 mm (1.6 in)
1951	23.4 mm (0.9 in)
1952	45.2 mm (1.8 in)
1953	38.9 mm (1.5 in)
1954	33.0 mm (1.3 in)
1960	26.2 mm (1.0 in)
1961	29.5 mm (1.2 in)
1962	33.8 mm (1.3 in)
1963	0.0 mm (0.00 in)
1964	49.5 mm (1.9 in)
1965	48.3 mm (1.9 in)
1966	34.5 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Roto (Merimerriwa Tank), 1891 to 1966. The record is 111.0 mm (4.4 in) in 1906, marked on the chart; the median year is 52.3 mm (2.1 in).

Wettest five days (Rx5day) at Roto (Merimerriwa Tank) by year
Year	Wettest five days (Rx5day)
1891	63.2 mm (2.5 in)
1892	49.6 mm (2.0 in)
1893	50.3 mm (2.0 in)
1894	65.8 mm (2.6 in)
1895	43.2 mm (1.7 in)
1896	53.6 mm (2.1 in)
1897	73.4 mm (2.9 in)
1898	34.3 mm (1.4 in)
1899	37.3 mm (1.5 in)
1900	38.6 mm (1.5 in)
1901	35.1 mm (1.4 in)
1902	47.2 mm (1.9 in)
1903	43.5 mm (1.7 in)
1904	53.3 mm (2.1 in)
1905	72.2 mm (2.8 in)
1906	111.0 mm (4.4 in)
1907	55.9 mm (2.2 in)
1908	59.2 mm (2.3 in)
1909	45.5 mm (1.8 in)
1910	54.0 mm (2.1 in)
1911	49.3 mm (1.9 in)
1912	55.3 mm (2.2 in)
1913	58.4 mm (2.3 in)
1914	28.7 mm (1.1 in)
1915	38.5 mm (1.5 in)
1916	77.5 mm (3.1 in)
1917	65.8 mm (2.6 in)
1918	43.2 mm (1.7 in)
1919	45.7 mm (1.8 in)
1920	51.6 mm (2.0 in)
1949	55.8 mm (2.2 in)
1950	75.7 mm (3.0 in)
1951	26.8 mm (1.1 in)
1952	67.6 mm (2.7 in)
1953	52.3 mm (2.1 in)
1954	39.6 mm (1.6 in)
1960	28.2 mm (1.1 in)
1961	54.8 mm (2.2 in)
1962	40.7 mm (1.6 in)
1963	0.0 mm (0.00 in)
1964	95.0 mm (3.7 in)
1965	85.1 mm (3.4 in)
1966	59.4 mm (2.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Roto (Merimerriwa Tank), 1891 to 1966. The record is 211 days in 1919, marked on the chart; the median year is 56 days.

Longest dry spell (CDD) at Roto (Merimerriwa Tank) by year
Year	Longest dry spell (CDD)
1891	34 days
1892	64 days
1893	62 days
1894	26 days
1895	59 days
1896	28 days
1897	65 days
1898	42 days
1899	56 days
1900	40 days
1901	64 days
1902	42 days
1903	64 days
1904	43 days
1905	60 days
1906	37 days
1907	45 days
1908	55 days
1909	27 days
1910	69 days
1911	60 days
1912	74 days
1913	56 days
1914	43 days
1915	74 days
1916	25 days
1917	29 days
1918	33 days
1919	211 days
1920	153 days
1949	29 days
1950	51 days
1951	99 days
1952	79 days
1953	57 days
1954	61 days
1960	37 days
1961	38 days
1962	57 days
1963	59 days
1964	59 days
1965	98 days
1966	38 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

36 years, 1891 to 1965

A day with at least 38.1 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 73.4 mm (2.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Roto (Merimerriwa Tank): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	38.1 mm (1.5 in)
5 years	49.7 mm (2.0 in)
10 years	56.4 mm (2.2 in)
25 years	63.9 mm (2.5 in)
50 years	68.9 mm (2.7 in)	Longer than the 36 years of record
100 years	73.4 mm (2.9 in)	Longer than the 36 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, 36 years of values from 1891 to 1965.

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: 67.8 mm (2.7 in) in 1906; 63.2 mm (2.5 in) in 1891; 63.0 mm (2.5 in) in 1917.

Download the Data

Data for Roto (Merimerriwa Tank) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Roto (Merimerriwa Tank) 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

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

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a