Roto (Merimerriwa Tank) Threshold Days by Year (ASN00049027)

3 fixed thresholds counted per year at Roto (Merimerriwa Tank) (ASN00049027): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Roto (Merimerriwa Tank) Thresholds

Roto (Merimerriwa Tank): days with 10 mm (0.39 in) or more of precipitation in 36 years, most in 1906 with 18.
Roto (Merimerriwa Tank): days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1911 with 5.
Roto (Merimerriwa Tank): days with 50 mm (1.97 in) or more of precipitation in 5 years, most in 1908 with 2.
3 fixed thresholds have at least one qualifying day at Roto (Merimerriwa Tank).

Days with 10 mm (0.39 in) or more of precipitation

36 years with a qualifying day

Days per year at Roto (Merimerriwa Tank) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 18 in 1906.

Days with 10 mm (0.39 in) or more of precipitation per year at Roto (Merimerriwa Tank)
Year	Days	Decade average
1891	12	11.6
1892	13	11.6
1893	12	11.6
1894	16	11.6
1895	12	11.6
1896	10	11.6
1897	10	11.6
1898	10	11.6
1899	9	11.6
1900	8	10
1901	4	10
1902	8	10
1903	7	10
1904	11	10
1905	16	10
1906	18	10
1907	10	10
1908	9	10
1909	9	10
1910	14	11.2
1911	17	11.2
1912	10	11.2
1913	15	11.2
1914	4	11.2
1915	11	11.2
1916	15	11.2
1917	16	11.2
1918	5	11.2
1919	5	11.2
1949	11	11
1950	10	10.8
1951	10	10.8
1952	11	10.8
1953	12	10.8
1964	13	12
1965	11	12

For each year, a bar from the first to the last day at Roto (Merimerriwa Tank) meeting 10 mm (0.39 in).

First to last qualifying date each year at Roto (Merimerriwa Tank)
Year	First date	Last date
1891	1891-01-04	1891-12-02
1892	1892-04-29	1892-11-21
1893	1893-04-25	1893-12-28
1894	1894-03-21	1894-12-27
1895	1895-01-04	1895-12-10
1896	1896-02-12	1896-11-27
1897	1897-01-09	1897-12-31
1898	1898-02-13	1898-12-23
1899	1899-02-27	1899-11-06
1900	1900-01-06	1900-08-01
1901	1901-03-15	1901-08-27
1902	1902-02-11	1902-12-17
1903	1903-07-14	1903-10-05
1904	1904-01-02	1904-12-17
1905	1905-01-04	1905-12-31
1906	1906-02-28	1906-12-18
1907	1907-01-25	1907-12-28
1908	1908-01-24	1908-11-27
1909	1909-01-31	1909-08-20
1910	1910-01-11	1910-11-30
1911	1911-01-13	1911-12-16
1912	1912-03-10	1912-12-02
1913	1913-01-03	1913-10-27
1914	1914-05-12	1914-12-21
1915	1915-05-14	1915-12-10
1916	1916-01-28	1916-12-01
1917	1917-01-22	1917-11-22
1918	1918-05-16	1918-10-07
1919	1919-02-26	1919-12-28
1949	1949-03-09	1949-11-11
1950	1950-01-16	1950-11-08
1951	1951-05-09	1951-10-02
1952	1952-03-20	1952-11-26
1953	1953-01-13	1953-10-25
1964	1964-04-21	1964-11-03
1965	1965-04-09	1965-12-07

Every Fixed Threshold

Fixed thresholds at Roto (Merimerriwa Tank)
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	36	18	1906	11
25 mm (0.98 in): Days with 25 mm or more rain	31	5	1911	5
50 mm (1.97 in): Days with 50 mm or more rain	5	2	1908	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1891.

Download the Data

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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

Roto (Merimerriwa Tank) Threshold Days by Year (ASN00049027)

Key Facts for Roto (Merimerriwa Tank) Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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