Record highRecord low2026 daily maximum2026 daily minimum
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
18.3 C (64.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
27.2 C (81.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-14.4 C (6.1 F)
n/a
n/a
May
36.1 C (97.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
41.1 C (106.0 F)
1.1 C (34.0 F)
n/a
n/a
Aug
38.9 C (102.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hamilton still stand. 1871 holds the most, with 46.
Standing records at Hamilton by the year they were set
Year set
Standing records
1866
28
1867
35
1868
40
1869
26
1870
12
1871
46
1872
16
1873
12
1874
6
1876
24
1877
15
1878
10
1879
24
1880
31
1881
43
1882
35
1883
26
1884
32
1885
39
1886
21
1887
40
1888
8
1897
11
1898
17
1899
25
1900
21
1901
5
1902
8
1903
13
1904
17
1905
14
1906
3
1907
14
1908
17
1909
17
1910
16
1911
23
1912
22
1913
15
1914
23
1915
17
1916
29
1917
26
1918
25
1919
15
1920
18
1921
21
1922
12
1923
18
1924
8
1925
27
1926
16
1927
16
1928
24
1929
15
1938
11
1939
8
1940
11
1941
20
1942
11
1943
14
1944
12
1945
35
1946
21
1947
13
1948
20
1949
28
1950
20
1951
14
1952
8
1953
18
1954
14
1955
15
1956
8
1957
21
1958
5
All-Time Record Progression
2 new records
2 all-time records were set at Hamilton between 13 January 1914 and 31 July 1916. Each dot is a new record.
When Hamilton set new all-time records
Date
Kind
Detail
1914-01-13
Record low maximum temperature
Record low maximum temperature -20.6 C (-5.1 F)
1916-07-31
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
Wettest Day of Each Month
Jan: 116.6 mm (4.6 in)
The wettest day on record for each calendar month at Hamilton. The most was 116.6 mm (4.6 in) on 2 January 1870.
Record daily precipitation for each month at Hamilton
Month
Record daily precipitation (mm)
Date
Jan
116.6 mm (4.6 in)
2 January 1870
Feb
48.5 mm (1.9 in)
9 February 1868
Mar
83.1 mm (3.3 in)
28 March 1870
Apr
55.9 mm (2.2 in)
30 April 1886
May
80.8 mm (3.2 in)
25 May 1953
Jun
88.9 mm (3.5 in)
28 June 1869
Jul
64.8 mm (2.6 in)
22 July 1928
Aug
77.2 mm (3.0 in)
28 August 1950
Sep
93.7 mm (3.7 in)
8 September 1869
Oct
92.7 mm (3.6 in)
15 October 1954
Nov
57.9 mm (2.3 in)
15 November 1871
Dec
48.3 mm (1.9 in)
27 December 1942
Period of Record Coverage
1866 to 1958
Complete yearUnder 90 percent of days
76 years of record at Hamilton, 1866 to 1958. 20 years have data for under 90 percent of days and are left out of rankings: 1866, 1867, 1868, 1869, 1870, 1871, 1873, 1874 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 54 complete years at Hamilton, 1866 to 1956. Blue stripes are years cooler than the station's own mean of 8.2 C (46.8 F); red stripes are warmer. The coolest year was 1885, at 5.7 C (42.2 F), and the warmest was 1953, at 9.8 C (49.7 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Hamilton as warming stripes, 1866 to 1956
Year
Annual mean temperature
Difference from the station mean
1866
7.0 C
-1.20 C
1867
7.3 C
-0.95 C
1868
6.4 C
-1.81 C
1870
8.3 C
+0.09 C
1871
7.3 C
-0.94 C
1872
7.6 C
-0.67 C
1873
7.2 C
-1.02 C
1876
7.5 C
-0.72 C
1877
9.3 C
+1.03 C
1878
9.7 C
+1.47 C
1879
8.2 C
-0.05 C
1880
8.6 C
+0.38 C
1881
8.2 C
+0.00 C
1882
7.7 C
-0.57 C
1883
6.2 C
-1.99 C
1884
7.3 C
-0.94 C
1885
5.7 C
-2.57 C
1886
6.9 C
-1.35 C
1898
9.4 C
+1.17 C
1899
8.6 C
+0.35 C
1902
8.4 C
+0.12 C
1908
8.8 C
+0.56 C
1909
8.3 C
+0.10 C
1911
9.1 C
+0.86 C
1912
7.4 C
-0.87 C
1913
9.0 C
+0.74 C
1915
8.3 C
+0.06 C
1916
8.2 C
-0.06 C
1917
6.4 C
-1.80 C
1918
7.8 C
-0.40 C
1920
7.8 C
-0.41 C
1922
9.0 C
+0.80 C
1924
7.6 C
-0.65 C
1926
7.1 C
-1.18 C
1927
8.6 C
+0.39 C
1928
8.6 C
+0.36 C
1929
8.5 C
+0.30 C
1939
8.8 C
+0.54 C
1940
7.5 C
-0.75 C
1941
9.4 C
+1.13 C
1943
8.0 C
-0.28 C
1944
9.0 C
+0.74 C
1945
8.4 C
+0.18 C
1946
9.5 C
+1.28 C
1947
8.8 C
+0.54 C
1948
8.6 C
+0.36 C
1949
9.8 C
+1.56 C
1950
8.3 C
+0.08 C
1951
8.8 C
+0.60 C
1952
9.6 C
+1.33 C
1953
9.8 C
+1.59 C
1954
9.1 C
+0.89 C
1955
9.7 C
+1.47 C
1956
8.1 C
-0.10 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1866 to 1956. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 54 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hamilton
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.2) per decade
0.3 F (0.2 to 0.4) per decade
1866 to 1956
54
Rise
Mean daily maximum
0.0 C (-0.1 to 0.1) per decade
0.0 F (-0.2 to 0.2) per decade
1866 to 1956
54
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.8) per decade
1866 to 1956
54
Rise
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
1866 to 1958
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)
41.1 C (106.0 F)
1868
35.0 C (95.0 F)
76
Coldest night (TNn)
-30.6 C (-23.1 F)
1884
-21.9 C (-7.5 F)
76
Wettest day (Rx1day)
116.6 mm (4.6 in)
1870
44.2 mm (1.7 in)
73
Wettest five days (Rx5day)
132.3 mm (5.2 in)
1878
66.8 mm (2.6 in)
73
Longest dry spell (CDD)
41 days
1908
18 days
73
Hottest day (TXx)
The hottest day of the year at Hamilton, 1866 to 1958. The record is 41.1 C (106.0 F) in 1868, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Hamilton by year
Year
Hottest day (TXx)
1866
35.6 C (96.1 F)
1867
37.8 C (100.0 F)
1868
41.1 C (106.0 F)
1869
34.4 C (93.9 F)
1870
38.9 C (102.0 F)
1871
37.2 C (99.0 F)
1872
35.0 C (95.0 F)
1873
33.3 C (91.9 F)
1874
16.1 C (61.0 F)
1876
35.6 C (96.1 F)
1877
35.6 C (96.1 F)
1878
37.8 C (100.0 F)
1879
35.6 C (96.1 F)
1880
33.9 C (93.0 F)
1881
37.8 C (100.0 F)
1882
33.3 C (91.9 F)
1883
32.2 C (90.0 F)
1884
35.0 C (95.0 F)
1885
34.4 C (93.9 F)
1886
35.6 C (96.1 F)
1887
37.8 C (100.0 F)
1888
31.1 C (88.0 F)
1897
34.4 C (93.9 F)
1898
35.0 C (95.0 F)
1899
36.1 C (97.0 F)
1900
33.9 C (93.0 F)
1901
35.0 C (95.0 F)
1902
33.3 C (91.9 F)
1903
30.0 C (86.0 F)
1904
31.1 C (88.0 F)
1905
32.2 C (90.0 F)
1906
18.9 C (66.0 F)
1907
33.9 C (93.0 F)
1908
35.6 C (96.1 F)
1909
35.0 C (95.0 F)
1910
35.0 C (95.0 F)
1911
39.4 C (102.9 F)
1912
33.3 C (91.9 F)
1913
36.1 C (97.0 F)
1914
35.0 C (95.0 F)
1915
31.1 C (88.0 F)
1916
37.2 C (99.0 F)
1917
36.1 C (97.0 F)
1918
37.2 C (99.0 F)
1919
37.8 C (100.0 F)
1920
35.0 C (95.0 F)
1921
37.8 C (100.0 F)
1922
35.0 C (95.0 F)
1923
37.2 C (99.0 F)
1924
34.4 C (93.9 F)
1925
38.3 C (100.9 F)
1926
35.0 C (95.0 F)
1927
36.7 C (98.1 F)
1928
35.0 C (95.0 F)
1929
35.0 C (95.0 F)
1938
35.0 C (95.0 F)
1939
35.6 C (96.1 F)
1940
34.4 C (93.9 F)
1941
37.8 C (100.0 F)
1942
32.8 C (91.0 F)
1943
35.0 C (95.0 F)
1944
36.1 C (97.0 F)
1945
33.9 C (93.0 F)
1946
34.4 C (93.9 F)
1947
36.1 C (97.0 F)
1948
38.9 C (102.0 F)
1949
38.3 C (100.9 F)
1950
33.9 C (93.0 F)
1951
33.3 C (91.9 F)
1952
36.1 C (97.0 F)
1953
37.8 C (100.0 F)
1954
35.0 C (95.0 F)
1955
38.3 C (100.9 F)
1956
35.6 C (96.1 F)
1957
36.1 C (97.0 F)
1958
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Hamilton, 1866 to 1958. The record is -30.6 C (-23.1 F) in 1884, marked on the chart; the median year is -21.9 C (-7.5 F).
Coldest night (TNn) at Hamilton by year
Year
Coldest night (TNn)
1866
-28.9 C (-20.0 F)
1867
-23.3 C (-9.9 F)
1868
-28.3 C (-18.9 F)
1869
-22.2 C (-8.0 F)
1870
-23.3 C (-9.9 F)
1871
-27.8 C (-18.0 F)
1872
-23.9 C (-11.0 F)
1873
-26.1 C (-15.0 F)
1874
-16.7 C (1.9 F)
1876
-19.4 C (-2.9 F)
1877
-22.2 C (-8.0 F)
1878
-18.3 C (-0.9 F)
1879
-20.6 C (-5.1 F)
1880
-23.3 C (-9.9 F)
1881
-29.4 C (-20.9 F)
1882
-23.9 C (-11.0 F)
1883
-24.4 C (-11.9 F)
1884
-30.6 C (-23.1 F)
1885
-26.7 C (-16.1 F)
1886
-26.1 C (-15.0 F)
1887
-21.1 C (-6.0 F)
1888
-17.8 C (0.0 F)
1897
-16.1 C (3.0 F)
1898
-23.9 C (-11.0 F)
1899
-23.9 C (-11.0 F)
1900
-21.7 C (-7.1 F)
1901
-21.7 C (-7.1 F)
1902
-17.8 C (0.0 F)
1903
-19.4 C (-2.9 F)
1904
-23.3 C (-9.9 F)
1905
-24.4 C (-11.9 F)
1906
-16.1 C (3.0 F)
1907
-22.8 C (-9.0 F)
1908
-25.0 C (-13.0 F)
1909
-22.2 C (-8.0 F)
1910
-21.7 C (-7.1 F)
1911
-17.8 C (0.0 F)
1912
-25.6 C (-14.1 F)
1913
-18.3 C (-0.9 F)
1914
-27.2 C (-17.0 F)
1915
-19.4 C (-2.9 F)
1916
-23.3 C (-9.9 F)
1917
-24.4 C (-11.9 F)
1918
-26.7 C (-16.1 F)
1919
-18.9 C (-2.0 F)
1920
-25.0 C (-13.0 F)
1921
-19.4 C (-2.9 F)
1922
-18.9 C (-2.0 F)
1923
-20.6 C (-5.1 F)
1924
-20.0 C (-4.0 F)
1925
-26.1 C (-15.0 F)
1926
-18.9 C (-2.0 F)
1927
-23.9 C (-11.0 F)
1928
-18.9 C (-2.0 F)
1929
-22.2 C (-8.0 F)
1938
-13.9 C (7.0 F)
1939
-19.4 C (-2.9 F)
1940
-18.9 C (-2.0 F)
1941
-18.9 C (-2.0 F)
1942
-26.1 C (-15.0 F)
1943
-27.2 C (-17.0 F)
1944
-18.9 C (-2.0 F)
1945
-24.4 C (-11.9 F)
1946
-18.9 C (-2.0 F)
1947
-16.1 C (3.0 F)
1948
-23.9 C (-11.0 F)
1949
-16.1 C (3.0 F)
1950
-21.7 C (-7.1 F)
1951
-18.9 C (-2.0 F)
1952
-19.4 C (-2.9 F)
1953
-15.0 C (5.0 F)
1954
-20.0 C (-4.0 F)
1955
-22.2 C (-8.0 F)
1956
-13.3 C (8.1 F)
1957
-22.2 C (-8.0 F)
1958
-20.6 C (-5.1 F)
Wettest day (Rx1day)
The wettest day of the year at Hamilton, 1866 to 1958. The record is 116.6 mm (4.6 in) in 1870, marked on the chart; the median year is 44.2 mm (1.7 in).
Wettest day (Rx1day) at Hamilton by year
Year
Wettest day (Rx1day)
1866
47.2 mm (1.9 in)
1867
50.8 mm (2.0 in)
1868
61.5 mm (2.4 in)
1869
93.7 mm (3.7 in)
1870
116.6 mm (4.6 in)
1871
57.9 mm (2.3 in)
1872
51.8 mm (2.0 in)
1873
50.8 mm (2.0 in)
1874
n/a
1876
n/a
1877
31.5 mm (1.2 in)
1878
85.9 mm (3.4 in)
1879
46.7 mm (1.8 in)
1880
40.6 mm (1.6 in)
1881
35.1 mm (1.4 in)
1882
33.5 mm (1.3 in)
1883
35.6 mm (1.4 in)
1884
36.8 mm (1.4 in)
1885
50.8 mm (2.0 in)
1886
55.9 mm (2.2 in)
1887
48.3 mm (1.9 in)
1888
n/a
1897
36.6 mm (1.4 in)
1898
30.5 mm (1.2 in)
1899
37.1 mm (1.5 in)
1900
31.5 mm (1.2 in)
1901
39.1 mm (1.5 in)
1902
28.7 mm (1.1 in)
1903
37.1 mm (1.5 in)
1904
59.4 mm (2.3 in)
1905
39.6 mm (1.6 in)
1906
29.5 mm (1.2 in)
1907
29.2 mm (1.1 in)
1908
31.0 mm (1.2 in)
1909
45.0 mm (1.8 in)
1910
40.9 mm (1.6 in)
1911
36.6 mm (1.4 in)
1912
61.7 mm (2.4 in)
1913
39.9 mm (1.6 in)
1914
36.3 mm (1.4 in)
1915
32.0 mm (1.3 in)
1916
46.0 mm (1.8 in)
1917
44.2 mm (1.7 in)
1918
74.2 mm (2.9 in)
1919
38.1 mm (1.5 in)
1920
71.1 mm (2.8 in)
1921
43.2 mm (1.7 in)
1922
48.8 mm (1.9 in)
1923
35.6 mm (1.4 in)
1924
31.2 mm (1.2 in)
1925
50.8 mm (2.0 in)
1926
58.4 mm (2.3 in)
1927
52.6 mm (2.1 in)
1928
64.8 mm (2.6 in)
1929
41.4 mm (1.6 in)
1938
25.4 mm (1.0 in)
1939
30.0 mm (1.2 in)
1940
27.9 mm (1.1 in)
1941
38.1 mm (1.5 in)
1942
58.4 mm (2.3 in)
1943
53.8 mm (2.1 in)
1944
63.5 mm (2.5 in)
1945
65.0 mm (2.6 in)
1946
41.4 mm (1.6 in)
1947
35.6 mm (1.4 in)
1948
48.3 mm (1.9 in)
1949
43.2 mm (1.7 in)
1950
77.2 mm (3.0 in)
1951
31.8 mm (1.3 in)
1952
57.2 mm (2.3 in)
1953
80.8 mm (3.2 in)
1954
92.7 mm (3.6 in)
1955
63.0 mm (2.5 in)
1956
53.6 mm (2.1 in)
1957
25.4 mm (1.0 in)
1958
52.1 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hamilton, 1866 to 1958. The record is 132.3 mm (5.2 in) in 1878, marked on the chart; the median year is 66.8 mm (2.6 in).
Wettest five days (Rx5day) at Hamilton by year
Year
Wettest five days (Rx5day)
1866
59.7 mm (2.4 in)
1867
68.6 mm (2.7 in)
1868
82.6 mm (3.3 in)
1869
117.8 mm (4.6 in)
1870
129.3 mm (5.1 in)
1871
112.3 mm (4.4 in)
1872
72.2 mm (2.8 in)
1873
72.7 mm (2.9 in)
1874
n/a
1876
n/a
1877
50.3 mm (2.0 in)
1878
132.3 mm (5.2 in)
1879
87.1 mm (3.4 in)
1880
77.2 mm (3.0 in)
1881
59.1 mm (2.3 in)
1882
62.0 mm (2.4 in)
1883
60.9 mm (2.4 in)
1884
53.3 mm (2.1 in)
1885
96.5 mm (3.8 in)
1886
60.5 mm (2.4 in)
1887
69.9 mm (2.8 in)
1888
n/a
1897
51.4 mm (2.0 in)
1898
60.5 mm (2.4 in)
1899
52.0 mm (2.0 in)
1900
62.0 mm (2.4 in)
1901
83.5 mm (3.3 in)
1902
84.7 mm (3.3 in)
1903
47.0 mm (1.9 in)
1904
66.8 mm (2.6 in)
1905
39.6 mm (1.6 in)
1906
32.3 mm (1.3 in)
1907
56.7 mm (2.2 in)
1908
67.8 mm (2.7 in)
1909
78.6 mm (3.1 in)
1910
63.8 mm (2.5 in)
1911
54.1 mm (2.1 in)
1912
101.6 mm (4.0 in)
1913
43.5 mm (1.7 in)
1914
36.3 mm (1.4 in)
1915
61.5 mm (2.4 in)
1916
66.8 mm (2.6 in)
1917
74.4 mm (2.9 in)
1918
75.0 mm (3.0 in)
1919
63.4 mm (2.5 in)
1920
71.1 mm (2.8 in)
1921
110.3 mm (4.3 in)
1922
76.5 mm (3.0 in)
1923
41.9 mm (1.6 in)
1924
53.8 mm (2.1 in)
1925
50.8 mm (2.0 in)
1926
85.9 mm (3.4 in)
1927
79.6 mm (3.1 in)
1928
97.0 mm (3.8 in)
1929
67.3 mm (2.6 in)
1938
42.9 mm (1.7 in)
1939
36.4 mm (1.4 in)
1940
41.1 mm (1.6 in)
1941
56.9 mm (2.2 in)
1942
116.8 mm (4.6 in)
1943
64.3 mm (2.5 in)
1944
63.5 mm (2.5 in)
1945
78.5 mm (3.1 in)
1946
54.4 mm (2.1 in)
1947
60.5 mm (2.4 in)
1948
87.1 mm (3.4 in)
1949
57.6 mm (2.3 in)
1950
124.7 mm (4.9 in)
1951
69.9 mm (2.8 in)
1952
89.5 mm (3.5 in)
1953
106.0 mm (4.2 in)
1954
130.1 mm (5.1 in)
1955
75.0 mm (3.0 in)
1956
62.2 mm (2.4 in)
1957
30.4 mm (1.2 in)
1958
76.2 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hamilton, 1866 to 1958. The record is 41 days in 1908, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Hamilton by year
Year
Longest dry spell (CDD)
1866
14 days
1867
15 days
1868
22 days
1869
25 days
1870
17 days
1871
15 days
1872
15 days
1873
17 days
1874
n/a
1876
n/a
1877
32 days
1878
15 days
1879
18 days
1880
12 days
1881
24 days
1882
20 days
1883
14 days
1884
20 days
1885
19 days
1886
19 days
1887
25 days
1888
n/a
1897
23 days
1898
19 days
1899
22 days
1900
18 days
1901
16 days
1902
20 days
1903
18 days
1904
13 days
1905
20 days
1906
11 days
1907
18 days
1908
41 days
1909
12 days
1910
25 days
1911
17 days
1912
19 days
1913
18 days
1914
19 days
1915
17 days
1916
26 days
1917
23 days
1918
11 days
1919
19 days
1920
24 days
1921
12 days
1922
18 days
1923
16 days
1924
26 days
1925
11 days
1926
15 days
1927
22 days
1928
22 days
1929
36 days
1938
17 days
1939
20 days
1940
13 days
1941
20 days
1942
25 days
1943
32 days
1944
19 days
1945
14 days
1946
11 days
1947
18 days
1948
28 days
1949
29 days
1950
21 days
1951
16 days
1952
16 days
1953
15 days
1954
16 days
1955
12 days
1956
38 days
1957
16 days
1958
15 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
54 years with a frost
Across 54 years with a frost, the median last spring frost at Hamilton falls on 30 April and the median first autumn frost on 17 October, which leaves a median of 174 days between them.
Fitted over all years, the growing season changes by +3.8 days per decade at this station.
Frost dates and growing season at Hamilton
Measure
Median, all years
Earliest period
Recent period (1912 to 1956)
Recent against earliest
Fitted trend
Last spring frost
30 April
n/a
28 April
n/a
-1.7 days per decade
First autumn frost
17 October
n/a
21 October
n/a
+2.1 days per decade
Growing days
174 days
n/a
183 days
n/a
+3.8 days per decade
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
38 years, 1866 to 1952
A day with at least 44.6 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 124.2 mm (4.9 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
44.6 mm (1.8 in)
5 years
60.8 mm (2.4 in)
10 years
73.3 mm (2.9 in)
25 years
91.5 mm (3.6 in)
50 years
107.0 mm (4.2 in)
Longer than the 38 years of record
100 years
124.2 mm (4.9 in)
Longer than the 38 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, 38 years of values from 1866 to 1952.
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: 116.6 mm (4.6 in) in 1870; 93.7 mm (3.7 in) in 1869; 85.9 mm (3.4 in) in 1878.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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.