Hamilton Weather Records (ASN00090044)

Record envelope, standing records and threshold days for Hamilton (ASN00090044), Australia, with 106 years of record.

Key Facts for Hamilton

Hamilton (ASN00090044) is a weather station in Australia at -37.73 latitude and 142.02 longitude, 209 m (686 ft) above sea level.
The station reports from 1878 to 1983, 106 years of record.
1,464 records set at Hamilton still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Hamilton set a monthly record daily precipitation of 61.2 mm (2.4 in) on 3 May 1983.

About the Station

Location: Australia, -37.73 latitude, 142.02 longitude.
Elevation: 209 m (686 ft).
Period of record: 1878 to 1983, 106 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 Hamilton. 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 Hamilton, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	42.8 C (109.0 F)	3.1 C (37.6 F)	n/a	n/a
Feb	42.6 C (108.7 F)	3.2 C (37.8 F)	n/a	n/a
Mar	38.5 C (101.3 F)	2.0 C (35.6 F)	n/a	n/a
Apr	32.9 C (91.2 F)	-0.4 C (31.3 F)	n/a	n/a
May	26.7 C (80.1 F)	-0.6 C (30.9 F)	n/a	n/a
Jun	22.2 C (72.0 F)	-3.4 C (25.9 F)	n/a	n/a
Jul	21.5 C (70.7 F)	-3.4 C (25.9 F)	n/a	n/a
Aug	23.3 C (73.9 F)	-2.0 C (28.4 F)	n/a	n/a
Sep	30.6 C (87.1 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	33.6 C (92.5 F)	-1.7 C (28.9 F)	n/a	n/a
Nov	38.8 C (101.8 F)	0.8 C (33.4 F)	n/a	n/a
Dec	39.5 C (103.1 F)	2.2 C (36.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Hamilton still stand. 1960 holds the most, with 90.

Standing records at Hamilton by the year they were set
Year set	Standing records
1957	70
1958	69
1959	68
1960	90
1961	53
1962	66
1963	50
1964	59
1965	74
1966	44
1967	65
1968	64
1969	70
1970	50
1971	45
1972	56
1973	59
1974	45
1975	58
1976	45
1977	48
1978	48
1979	34
1980	27
1981	3
1982	68
1983	36

All-Time Record Progression

3 new records

3 all-time records were set at Hamilton between 6 March 1910 and 17 March 1946. Each dot is a new record.

When Hamilton set new all-time records
Date	Kind	Detail
1910-03-06	Record daily precipitation	Record daily precipitation 86.6 mm (3.4 in)
1930-12-16	Record daily precipitation	Record daily precipitation 98.0 mm (3.9 in)
1946-03-17	Record daily precipitation	Record daily precipitation 113.5 mm (4.5 in)

Wettest Day of Each Month

Mar: 113.5 mm (4.5 in)

The wettest day on record for each calendar month at Hamilton. The most was 113.5 mm (4.5 in) on 17 March 1946.

Record daily precipitation for each month at Hamilton
Month	Record daily precipitation (mm)	Date
Jan	105.4 mm (4.1 in)	25 January 1959
Feb	77.0 mm (3.0 in)	7 February 1957
Mar	113.5 mm (4.5 in)	17 March 1946
Apr	45.7 mm (1.8 in)	9 April 1890
May	61.2 mm (2.4 in)	3 May 1983
Jun	39.9 mm (1.6 in)	30 June 1946
Jul	30.2 mm (1.2 in)	22 July 1906
Aug	34.3 mm (1.4 in)	27 August 1936
Sep	49.3 mm (1.9 in)	2 September 1908
Oct	49.3 mm (1.9 in)	15 October 1889
Nov	57.7 mm (2.3 in)	16 November 1970
Dec	98.0 mm (3.9 in)	16 December 1930

Period of Record Coverage

1957 to 1983

27 years of record at Hamilton, 1957 to 1983. 4 years have data for under 90 percent of days and are left out of rankings: 1980, 1981, 1982, 1983.

Days with data per year at Hamilton
Year	Days with data	Share of year	Complete
1957	364	100%	Yes
1958	363	99%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	364	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	364	100%	Yes
1967	365	100%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	351	96%	Yes
1973	365	100%	Yes
1974	361	99%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	169	46%	No
1981	31	8%	No
1982	304	83%	No
1983	178	49%	No

Latest Records

Latest records at Hamilton
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
3 May 1983	Hamilton, AU	monthly rain	61.2 mm (2.4 in)	3.8 mm (0.15 in)	57 years	44 of 100 (Notable)
4 April 1983	Hamilton, AU	daily rain	20.2 mm (0.8 in)	0.9 mm (0.04 in)	32 years	20 of 100 (Routine)
23 March 1983	Hamilton, AU	daily rain	42.0 mm (1.7 in)	18.4 mm (0.7 in)	0 years	32 of 100 (Routine)
22 March 1983	Hamilton, AU	daily rain	44.0 mm (1.7 in)	29.8 mm (1.2 in)	48 years	60 of 100 (Major)
27 January 1983	Hamilton, AU	daily rain	10.4 mm (0.4 in)	4.0 mm (0.16 in)	59 years	20 of 100 (Routine)
8 December 1982	Hamilton, AU	daily rain	15.8 mm (0.6 in)	4.6 mm (0.18 in)	44 years	20 of 100 (Routine)
23 March 1982	Hamilton, AU	daily rain	23.6 mm (0.9 in)	2.8 mm (0.11 in)	100 years	20 of 100 (Routine)
7 January 1982	Hamilton, AU	daily rain	18.5 mm (0.7 in)	3.8 mm (0.15 in)	95 years	20 of 100 (Routine)
20 May 1980	Hamilton, AU	daily rain	21.0 mm (0.8 in)	1.2 mm (0.05 in)	73 years	20 of 100 (Routine)
12 January 1980	Hamilton, AU	daily rain	26.4 mm (1.0 in)	12.7 mm (0.5 in)	78 years	49 of 100 (Notable)
10 October 1979	Hamilton, AU	daily rain	29.6 mm (1.2 in)	6.7 mm (0.26 in)	100 years	51 of 100 (Notable)
29 September 1979	Hamilton, AU	daily rain	16.2 mm (0.6 in)	1.5 mm (0.06 in)	77 years	20 of 100 (Routine)
28 September 1979	Hamilton, AU	daily rain	30.2 mm (1.2 in)	10.6 mm (0.4 in)	72 years	52 of 100 (Notable)
19 November 1978	Hamilton, AU	daily rain	40.2 mm (1.6 in)	28.3 mm (1.1 in)	8 years	52 of 100 (Notable)
7 August 1978	Hamilton, AU	daily rain	26.3 mm (1.0 in)	11.1 mm (0.4 in)	23 years	41 of 100 (Notable)
4 June 1978	Hamilton, AU	daily rain	22.8 mm (0.9 in)	6.3 mm (0.25 in)	48 years	20 of 100 (Routine)
11 May 1978	Hamilton, AU	daily rain	14.8 mm (0.6 in)	2.4 mm (0.09 in)	33 years	20 of 100 (Routine)
29 November 1977	Hamilton, AU	daily rain	38.0 mm (1.5 in)	27.1 mm (1.1 in)	38 years	61 of 100 (Major)
3 October 1977	Hamilton, AU	daily rain	19.6 mm (0.8 in)	5.4 mm (0.21 in)	48 years	20 of 100 (Routine)
16 October 1976	Hamilton, AU	daily rain	35.0 mm (1.4 in)	1.0 mm (0.04 in)	68 years	30 of 100 (Routine)

Climate Trend

22 complete years, 1957 to 1979

One stripe for each of 22 complete years at Hamilton, 1957 to 1979. Blue stripes are years cooler than the station's own mean of 13.7 C (56.6 F); red stripes are warmer. The coolest year was 1958, at 13.0 C (55.3 F), and the warmest was 1961, at 14.4 C (58.0 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at Hamilton as warming stripes, 1957 to 1979
Year	Annual mean temperature	Difference from the station mean
1957	13.1 C	-0.53 C
1958	13.0 C	-0.70 C
1959	13.7 C	+0.09 C
1960	13.0 C	-0.61 C
1961	14.4 C	+0.77 C
1962	13.8 C	+0.15 C
1963	13.7 C	+0.03 C
1964	13.0 C	-0.70 C
1965	13.6 C	-0.09 C
1966	13.4 C	-0.22 C
1967	14.0 C	+0.35 C
1968	13.9 C	+0.21 C
1969	13.4 C	-0.28 C
1970	13.2 C	-0.43 C
1971	13.8 C	+0.16 C
1973	14.1 C	+0.46 C
1974	14.1 C	+0.48 C
1975	14.0 C	+0.37 C
1976	13.7 C	+0.01 C
1977	13.8 C	+0.11 C
1978	13.7 C	+0.02 C
1979	14.1 C	+0.43 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1878 to 1983

Yearly extremes at Hamilton: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	1959	39.3 C (102.7 F)	27
Coldest night (TNn)	-3.4 C (25.9 F)	1976	-1.7 C (28.9 F)	27
Wettest day (Rx1day)	113.5 mm (4.5 in)	1946	33.6 mm (1.3 in)	106
Wettest five days (Rx5day)	206.2 mm (8.1 in)	1946	58.4 mm (2.3 in)	106
Longest dry spell (CDD)	58 days	1879	22 days	106

Hottest day (TXx)

The hottest day of the year at Hamilton, 1878 to 1983. The record is 42.8 C (109.0 F) in 1959, marked on the chart; the median year is 39.3 C (102.7 F).

Hottest day (TXx) at Hamilton by year
Year	Hottest day (TXx)
1878	n/a
1879	n/a
1880	n/a
1881	n/a
1882	n/a
1883	n/a
1884	n/a
1885	n/a
1886	n/a
1887	n/a
1888	n/a
1889	n/a
1890	n/a
1891	n/a
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	38.1 C (100.6 F)
1958	36.7 C (98.1 F)
1959	42.8 C (109.0 F)
1960	38.9 C (102.0 F)
1961	41.0 C (105.8 F)
1962	38.8 C (101.8 F)
1963	35.6 C (96.1 F)
1964	39.8 C (103.6 F)
1965	39.3 C (102.7 F)
1966	38.4 C (101.1 F)
1967	41.7 C (107.1 F)
1968	42.3 C (108.1 F)
1969	39.4 C (102.9 F)
1970	40.9 C (105.6 F)
1971	38.3 C (100.9 F)
1972	39.0 C (102.2 F)
1973	41.5 C (106.7 F)
1974	36.2 C (97.2 F)
1975	39.5 C (103.1 F)
1976	39.0 C (102.2 F)
1977	39.6 C (103.3 F)
1978	38.5 C (101.3 F)
1979	39.4 C (102.9 F)
1980	39.0 C (102.2 F)
1981	33.9 C (93.0 F)
1982	42.6 C (108.7 F)
1983	42.6 C (108.7 F)

Coldest night (TNn)

The coldest night of the year at Hamilton, 1878 to 1983. The record is -3.4 C (25.9 F) in 1976, marked on the chart; the median year is -1.7 C (28.9 F).

Coldest night (TNn) at Hamilton by year
Year	Coldest night (TNn)
1878	n/a
1879	n/a
1880	n/a
1881	n/a
1882	n/a
1883	n/a
1884	n/a
1885	n/a
1886	n/a
1887	n/a
1888	n/a
1889	n/a
1890	n/a
1891	n/a
1892	n/a
1893	n/a
1894	n/a
1895	n/a
1896	n/a
1897	n/a
1898	n/a
1899	n/a
1900	n/a
1901	n/a
1902	n/a
1903	n/a
1904	n/a
1905	n/a
1906	n/a
1907	n/a
1908	n/a
1909	n/a
1910	n/a
1911	n/a
1912	n/a
1913	n/a
1914	n/a
1915	n/a
1916	n/a
1917	n/a
1918	n/a
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	-1.7 C (28.9 F)
1958	-2.2 C (28.0 F)
1959	-1.7 C (28.9 F)
1960	-2.6 C (27.3 F)
1961	-1.7 C (28.9 F)
1962	-0.6 C (30.9 F)
1963	-1.7 C (28.9 F)
1964	0.3 C (32.5 F)
1965	-1.8 C (28.8 F)
1966	-1.3 C (29.7 F)
1967	-2.8 C (27.0 F)
1968	-1.8 C (28.8 F)
1969	-1.9 C (28.6 F)
1970	-0.4 C (31.3 F)
1971	-0.1 C (31.8 F)
1972	-2.8 C (27.0 F)
1973	-2.0 C (28.4 F)
1974	-1.8 C (28.8 F)
1975	-2.2 C (28.0 F)
1976	-3.4 C (25.9 F)
1977	0.0 C (32.0 F)
1978	-0.5 C (31.1 F)
1979	-1.6 C (29.1 F)
1980	0.0 C (32.0 F)
1981	5.2 C (41.4 F)
1982	-3.4 C (25.9 F)
1983	-0.4 C (31.3 F)

Wettest day (Rx1day)

The wettest day of the year at Hamilton, 1878 to 1983. The record is 113.5 mm (4.5 in) in 1946, marked on the chart; the median year is 33.6 mm (1.3 in).

Wettest day (Rx1day) at Hamilton by year
Year	Wettest day (Rx1day)
1878	40.1 mm (1.6 in)
1879	27.9 mm (1.1 in)
1880	20.1 mm (0.8 in)
1881	32.5 mm (1.3 in)
1882	36.1 mm (1.4 in)
1883	58.9 mm (2.3 in)
1884	61.2 mm (2.4 in)
1885	28.2 mm (1.1 in)
1886	35.1 mm (1.4 in)
1887	42.4 mm (1.7 in)
1888	27.9 mm (1.1 in)
1889	49.3 mm (1.9 in)
1890	45.7 mm (1.8 in)
1891	33.8 mm (1.3 in)
1892	26.9 mm (1.1 in)
1893	45.0 mm (1.8 in)
1894	48.3 mm (1.9 in)
1895	25.9 mm (1.0 in)
1896	28.4 mm (1.1 in)
1897	19.1 mm (0.8 in)
1898	23.4 mm (0.9 in)
1899	40.6 mm (1.6 in)
1900	46.7 mm (1.8 in)
1901	24.6 mm (1.0 in)
1902	58.2 mm (2.3 in)
1903	26.9 mm (1.1 in)
1904	37.8 mm (1.5 in)
1905	42.9 mm (1.7 in)
1906	57.2 mm (2.3 in)
1907	28.4 mm (1.1 in)
1908	49.3 mm (1.9 in)
1909	29.2 mm (1.1 in)
1910	86.6 mm (3.4 in)
1911	25.1 mm (1.0 in)
1912	18.3 mm (0.7 in)
1913	36.8 mm (1.4 in)
1914	25.7 mm (1.0 in)
1915	38.9 mm (1.5 in)
1916	36.3 mm (1.4 in)
1917	21.3 mm (0.8 in)
1918	23.9 mm (0.9 in)
1919	39.4 mm (1.6 in)
1920	22.4 mm (0.9 in)
1921	28.7 mm (1.1 in)
1922	28.2 mm (1.1 in)
1923	34.5 mm (1.4 in)
1924	29.5 mm (1.2 in)
1925	57.4 mm (2.3 in)
1926	38.4 mm (1.5 in)
1927	24.4 mm (1.0 in)
1928	51.1 mm (2.0 in)
1929	24.4 mm (1.0 in)
1930	98.0 mm (3.9 in)
1931	27.9 mm (1.1 in)
1932	48.3 mm (1.9 in)
1933	30.2 mm (1.2 in)
1934	41.9 mm (1.6 in)
1935	51.1 mm (2.0 in)
1936	34.3 mm (1.4 in)
1937	26.2 mm (1.0 in)
1938	40.9 mm (1.6 in)
1939	32.3 mm (1.3 in)
1940	20.8 mm (0.8 in)
1941	76.2 mm (3.0 in)
1942	21.6 mm (0.9 in)
1943	27.7 mm (1.1 in)
1944	22.6 mm (0.9 in)
1945	32.3 mm (1.3 in)
1946	113.5 mm (4.5 in)
1947	34.5 mm (1.4 in)
1948	33.3 mm (1.3 in)
1949	33.3 mm (1.3 in)
1950	20.6 mm (0.8 in)
1951	26.2 mm (1.0 in)
1952	73.2 mm (2.9 in)
1953	33.3 mm (1.3 in)
1954	37.6 mm (1.5 in)
1955	31.8 mm (1.3 in)
1956	33.0 mm (1.3 in)
1957	77.0 mm (3.0 in)
1958	24.1 mm (0.9 in)
1959	105.4 mm (4.1 in)
1960	60.5 mm (2.4 in)
1961	42.2 mm (1.7 in)
1962	36.3 mm (1.4 in)
1963	37.6 mm (1.5 in)
1964	29.2 mm (1.1 in)
1965	16.5 mm (0.6 in)
1966	21.6 mm (0.9 in)
1967	16.5 mm (0.6 in)
1968	22.6 mm (0.9 in)
1969	53.6 mm (2.1 in)
1970	57.7 mm (2.3 in)
1971	34.8 mm (1.4 in)
1972	19.1 mm (0.8 in)
1973	61.7 mm (2.4 in)
1974	41.6 mm (1.6 in)
1975	29.2 mm (1.1 in)
1976	35.0 mm (1.4 in)
1977	38.0 mm (1.5 in)
1978	40.2 mm (1.6 in)
1979	30.2 mm (1.2 in)
1980	30.4 mm (1.2 in)
1981	7.0 mm (0.28 in)
1982	23.6 mm (0.9 in)
1983	61.2 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Hamilton, 1878 to 1983. The record is 206.2 mm (8.1 in) in 1946, marked on the chart; the median year is 58.4 mm (2.3 in).

Wettest five days (Rx5day) at Hamilton by year
Year	Wettest five days (Rx5day)
1878	41.4 mm (1.6 in)
1879	50.8 mm (2.0 in)
1880	33.3 mm (1.3 in)
1881	56.6 mm (2.2 in)
1882	52.8 mm (2.1 in)
1883	95.8 mm (3.8 in)
1884	79.6 mm (3.1 in)
1885	50.2 mm (2.0 in)
1886	56.3 mm (2.2 in)
1887	58.2 mm (2.3 in)
1888	51.6 mm (2.0 in)
1889	59.0 mm (2.3 in)
1890	51.8 mm (2.0 in)
1891	71.9 mm (2.8 in)
1892	73.2 mm (2.9 in)
1893	69.9 mm (2.8 in)
1894	105.7 mm (4.2 in)
1895	56.2 mm (2.2 in)
1896	49.3 mm (1.9 in)
1897	39.1 mm (1.5 in)
1898	49.8 mm (2.0 in)
1899	70.1 mm (2.8 in)
1900	53.6 mm (2.1 in)
1901	53.1 mm (2.1 in)
1902	124.8 mm (4.9 in)
1903	47.4 mm (1.9 in)
1904	51.0 mm (2.0 in)
1905	58.6 mm (2.3 in)
1906	60.7 mm (2.4 in)
1907	83.1 mm (3.3 in)
1908	66.1 mm (2.6 in)
1909	62.0 mm (2.4 in)
1910	99.0 mm (3.9 in)
1911	64.7 mm (2.5 in)
1912	60.0 mm (2.4 in)
1913	43.5 mm (1.7 in)
1914	41.4 mm (1.6 in)
1915	55.5 mm (2.2 in)
1916	92.4 mm (3.6 in)
1917	52.4 mm (2.1 in)
1918	58.9 mm (2.3 in)
1919	59.2 mm (2.3 in)
1920	52.5 mm (2.1 in)
1921	43.9 mm (1.7 in)
1922	41.6 mm (1.6 in)
1923	54.9 mm (2.2 in)
1924	83.8 mm (3.3 in)
1925	72.1 mm (2.8 in)
1926	48.8 mm (1.9 in)
1927	51.1 mm (2.0 in)
1928	95.5 mm (3.8 in)
1929	47.5 mm (1.9 in)
1930	105.1 mm (4.1 in)
1931	52.6 mm (2.1 in)
1932	74.4 mm (2.9 in)
1933	56.1 mm (2.2 in)
1934	50.8 mm (2.0 in)
1935	79.1 mm (3.1 in)
1936	71.5 mm (2.8 in)
1937	53.1 mm (2.1 in)
1938	61.5 mm (2.4 in)
1939	62.8 mm (2.5 in)
1940	32.5 mm (1.3 in)
1941	118.8 mm (4.7 in)
1942	58.9 mm (2.3 in)
1943	45.7 mm (1.8 in)
1944	41.1 mm (1.6 in)
1945	69.3 mm (2.7 in)
1946	206.2 mm (8.1 in)
1947	74.4 mm (2.9 in)
1948	61.2 mm (2.4 in)
1949	60.4 mm (2.4 in)
1950	38.6 mm (1.5 in)
1951	73.2 mm (2.9 in)
1952	82.3 mm (3.2 in)
1953	62.2 mm (2.4 in)
1954	46.8 mm (1.8 in)
1955	58.7 mm (2.3 in)
1956	55.4 mm (2.2 in)
1957	109.1 mm (4.3 in)
1958	53.8 mm (2.1 in)
1959	109.2 mm (4.3 in)
1960	77.0 mm (3.0 in)
1961	60.4 mm (2.4 in)
1962	46.5 mm (1.8 in)
1963	73.4 mm (2.9 in)
1964	69.6 mm (2.7 in)
1965	27.5 mm (1.1 in)
1966	47.7 mm (1.9 in)
1967	37.1 mm (1.5 in)
1968	72.5 mm (2.9 in)
1969	60.0 mm (2.4 in)
1970	106.5 mm (4.2 in)
1971	67.6 mm (2.7 in)
1972	39.9 mm (1.6 in)
1973	64.0 mm (2.5 in)
1974	60.4 mm (2.4 in)
1975	43.0 mm (1.7 in)
1976	49.2 mm (1.9 in)
1977	53.4 mm (2.1 in)
1978	55.7 mm (2.2 in)
1979	54.8 mm (2.2 in)
1980	46.8 mm (1.8 in)
1981	13.8 mm (0.5 in)
1982	23.6 mm (0.9 in)
1983	94.6 mm (3.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Hamilton, 1878 to 1983. The record is 58 days in 1879, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Hamilton by year
Year	Longest dry spell (CDD)
1878	31 days
1879	58 days
1880	22 days
1881	22 days
1882	26 days
1883	22 days
1884	19 days
1885	16 days
1886	17 days
1887	28 days
1888	29 days
1889	32 days
1890	20 days
1891	44 days
1892	23 days
1893	24 days
1894	18 days
1895	22 days
1896	19 days
1897	20 days
1898	37 days
1899	25 days
1900	13 days
1901	26 days
1902	25 days
1903	22 days
1904	27 days
1905	20 days
1906	32 days
1907	25 days
1908	15 days
1909	17 days
1910	22 days
1911	18 days
1912	26 days
1913	28 days
1914	15 days
1915	27 days
1916	36 days
1917	22 days
1918	18 days
1919	22 days
1920	19 days
1921	21 days
1922	22 days
1923	35 days
1924	22 days
1925	20 days
1926	20 days
1927	20 days
1928	25 days
1929	21 days
1930	40 days
1931	25 days
1932	20 days
1933	19 days
1934	22 days
1935	22 days
1936	22 days
1937	19 days
1938	21 days
1939	22 days
1940	15 days
1941	14 days
1942	13 days
1943	18 days
1944	18 days
1945	21 days
1946	14 days
1947	19 days
1948	26 days
1949	27 days
1950	25 days
1951	40 days
1952	24 days
1953	18 days
1954	19 days
1955	22 days
1956	25 days
1957	18 days
1958	20 days
1959	19 days
1960	18 days
1961	35 days
1962	19 days
1963	27 days
1964	22 days
1965	24 days
1966	15 days
1967	32 days
1968	20 days
1969	30 days
1970	37 days
1971	21 days
1972	37 days
1973	12 days
1974	36 days
1975	24 days
1976	15 days
1977	18 days
1978	20 days
1979	12 days
1980	36 days
1981	18 days
1982	20 days
1983	33 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.

Frost Dates and Growing Season

20 years with a frost

Across 20 years with a frost, the median last spring frost at Hamilton falls on 25 August and the median first autumn frost on 11 June, which leaves a median of 288 days between them.

Frost dates and growing season at Hamilton
Measure	Median, all years	Earliest period	Recent period (1957 to 1979)	Recent against earliest	Fitted trend
Last spring frost	25 August	n/a	25 August	n/a	n/a
First autumn frost	11 June	n/a	11 June	n/a	n/a
Growing days	288 days	n/a	288 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

100 years, 1879 to 1982

A day with at least 33.7 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 112.5 mm (4.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Hamilton: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	33.7 mm (1.3 in)
5 years	48.1 mm (1.9 in)
10 years	59.9 mm (2.4 in)
25 years	77.9 mm (3.1 in)
50 years	93.9 mm (3.7 in)
100 years	112.5 mm (4.4 in)

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 100 years of values from 1879 to 1982.

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: 113.5 mm (4.5 in) in 1946; 105.4 mm (4.1 in) in 1959; 98.0 mm (3.9 in) in 1930.

Download the Data

Data for Hamilton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hamilton 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 2026-10-13. Last revised 13 October 2026 (2026-10-13).