Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Hamilton Rbg. 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 Rbg, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-28.3 C (-18.9 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-26.2 C (-15.2 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-12.2 C (10.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-2.0 C (28.4 F)
n/a
n/a
Jun
35.0 C (95.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
37.8 C (100.0 F)
7.2 C (45.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
3.6 C (38.5 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-6.1 C (21.0 F)
n/a
n/a
Nov
26.1 C (79.0 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
21.2 C (70.2 F)
-25.7 C (-14.3 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hamilton Rbg still stand. 1967 holds the most, with 60.
Standing records at Hamilton Rbg by the year they were set
Year set
Standing records
1950
38
1951
45
1952
35
1953
43
1954
42
1955
49
1956
50
1957
44
1958
38
1959
58
1960
37
1961
33
1962
38
1963
48
1964
55
1965
56
1966
50
1967
60
1968
38
1969
36
1970
33
1971
32
1972
33
1973
40
1974
43
1975
38
1976
59
1977
48
1978
31
1979
56
1980
38
1981
41
1982
43
1983
36
All-Time Record Progression
1 new records
1 all-time records were set at Hamilton Rbg between 11 January 1981 and 11 January 1981. Each dot is a new record.
When Hamilton Rbg set new all-time records
Date
Kind
Detail
1981-01-11
Record low maximum temperature
Record low maximum temperature -17.1 C (1.2 F)
Wettest Day of Each Month
Oct: 98.3 mm (3.9 in)
The wettest day on record for each calendar month at Hamilton Rbg. The most was 98.3 mm (3.9 in) on 15 October 1954.
Record daily precipitation for each month at Hamilton Rbg
Month
Record daily precipitation (mm)
Date
Jan
39.5 mm (1.6 in)
24 January 1979
Feb
39.1 mm (1.5 in)
16 February 1954
Mar
44.7 mm (1.8 in)
1 March 1972
Apr
43.7 mm (1.7 in)
28 April 1959
May
80.8 mm (3.2 in)
25 May 1953
Jun
57.2 mm (2.3 in)
25 June 1968
Jul
57.4 mm (2.3 in)
13 July 1964
Aug
93.8 mm (3.7 in)
24 August 1982
Sep
78.7 mm (3.1 in)
17 September 1976
Oct
98.3 mm (3.9 in)
15 October 1954
Nov
69.6 mm (2.7 in)
10 November 1962
Dec
40.0 mm (1.6 in)
24 December 1979
Period of Record Coverage
1950 to 1983
Complete yearUnder 90 percent of days
34 years of record at Hamilton Rbg, 1950 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1950.
Cooler than the station meanWarmer than the station mean
One stripe for each of 33 complete years at Hamilton Rbg, 1951 to 1983. Blue stripes are years cooler than the station's own mean of 8.5 C (47.4 F); red stripes are warmer. The coolest year was 1972, at 7.6 C (45.6 F), and the warmest was 1953, at 10.0 C (49.9 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Hamilton Rbg as warming stripes, 1951 to 1983
Year
Annual mean temperature
Difference from the station mean
1951
8.5 C
-0.06 C
1952
9.4 C
+0.87 C
1953
10.0 C
+1.43 C
1954
8.8 C
+0.31 C
1955
9.5 C
+0.99 C
1956
8.3 C
-0.27 C
1957
9.0 C
+0.42 C
1958
8.2 C
-0.37 C
1959
9.1 C
+0.54 C
1960
8.3 C
-0.19 C
1961
8.8 C
+0.31 C
1962
8.2 C
-0.37 C
1963
8.1 C
-0.45 C
1964
8.7 C
+0.18 C
1965
8.1 C
-0.43 C
1966
8.5 C
-0.05 C
1967
7.9 C
-0.61 C
1968
8.2 C
-0.38 C
1969
8.5 C
-0.04 C
1970
8.4 C
-0.17 C
1971
8.8 C
+0.28 C
1972
7.6 C
-0.96 C
1973
9.3 C
+0.74 C
1974
8.3 C
-0.23 C
1975
9.1 C
+0.55 C
1976
7.9 C
-0.61 C
1977
8.5 C
0.00 C
1978
7.7 C
-0.82 C
1979
8.2 C
-0.34 C
1980
8.1 C
-0.41 C
1981
8.7 C
+0.16 C
1982
8.0 C
-0.49 C
1983
9.0 C
+0.50 C
The annual mean temperature here has fallen by 0.22 C (0.03 to 0.41) per decade over 1951 to 1983. In Fahrenheit: 0.39 F (0.05 to 0.74) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hamilton Rbg
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.22 C (-0.41 to -0.03) per decade
-0.39 F (-0.74 to -0.05) per decade
1951 to 1983
33
Fall
Mean daily maximum
-0.4 C (-0.6 to -0.2) per decade
-0.8 F (-1.2 to -0.4) per decade
1951 to 1983
33
Fall
Mean daily minimum
0.01 C (-0.20 to 0.22) per decade
0.02 F (-0.35 to 0.39) per decade
1951 to 1983
33
Not clearly different from zero
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
1950 to 1983
Yearly extremes at Hamilton Rbg: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.8 C (100.0 F)
1953
34.4 C (93.9 F)
34
Coldest night (TNn)
-28.3 C (-18.9 F)
1976
-22.2 C (-8.0 F)
34
Wettest day (Rx1day)
98.3 mm (3.9 in)
1954
50.3 mm (2.0 in)
34
Wettest five days (Rx5day)
136.0 mm (5.4 in)
1981
78.1 mm (3.1 in)
34
Longest dry spell (CDD)
35 days
1956
17 days
34
Hottest day (TXx)
The hottest day of the year at Hamilton Rbg, 1950 to 1983. The record is 37.8 C (100.0 F) in 1953, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Hamilton Rbg by year
Year
Hottest day (TXx)
1950
33.9 C (93.0 F)
1951
32.2 C (90.0 F)
1952
35.6 C (96.1 F)
1953
37.8 C (100.0 F)
1954
34.4 C (93.9 F)
1955
37.8 C (100.0 F)
1956
34.4 C (93.9 F)
1957
33.9 C (93.0 F)
1958
32.8 C (91.0 F)
1959
36.7 C (98.1 F)
1960
32.2 C (90.0 F)
1961
32.8 C (91.0 F)
1962
35.0 C (95.0 F)
1963
35.0 C (95.0 F)
1964
34.4 C (93.9 F)
1965
33.9 C (93.0 F)
1966
36.1 C (97.0 F)
1967
33.3 C (91.9 F)
1968
34.4 C (93.9 F)
1969
34.4 C (93.9 F)
1970
32.8 C (91.0 F)
1971
34.4 C (93.9 F)
1972
34.4 C (93.9 F)
1973
36.7 C (98.1 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
33.3 C (91.9 F)
1977
35.0 C (95.0 F)
1978
35.5 C (95.9 F)
1979
33.7 C (92.7 F)
1980
33.1 C (91.6 F)
1981
34.7 C (94.5 F)
1982
33.0 C (91.4 F)
1983
35.8 C (96.4 F)
Coldest night (TNn)
The coldest night of the year at Hamilton Rbg, 1950 to 1983. The record is -28.3 C (-18.9 F) in 1976, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Hamilton Rbg by year
Year
Coldest night (TNn)
1950
-16.7 C (1.9 F)
1951
-22.2 C (-8.0 F)
1952
-20.0 C (-4.0 F)
1953
-17.8 C (0.0 F)
1954
-21.7 C (-7.1 F)
1955
-25.6 C (-14.1 F)
1956
-17.2 C (1.0 F)
1957
-22.8 C (-9.0 F)
1958
-20.0 C (-4.0 F)
1959
-22.2 C (-8.0 F)
1960
-23.3 C (-9.9 F)
1961
-23.3 C (-9.9 F)
1962
-24.4 C (-11.9 F)
1963
-23.9 C (-11.0 F)
1964
-20.0 C (-4.0 F)
1965
-25.0 C (-13.0 F)
1966
-21.1 C (-6.0 F)
1967
-22.8 C (-9.0 F)
1968
-21.7 C (-7.1 F)
1969
-17.8 C (0.0 F)
1970
-23.9 C (-11.0 F)
1971
-22.8 C (-9.0 F)
1972
-20.0 C (-4.0 F)
1973
-22.2 C (-8.0 F)
1974
-20.6 C (-5.1 F)
1975
-21.7 C (-7.1 F)
1976
-28.3 C (-18.9 F)
1977
-25.0 C (-13.0 F)
1978
-22.0 C (-7.6 F)
1979
-26.2 C (-15.2 F)
1980
-25.7 C (-14.3 F)
1981
-25.8 C (-14.4 F)
1982
-23.3 C (-9.9 F)
1983
-18.6 C (-1.5 F)
Wettest day (Rx1day)
The wettest day of the year at Hamilton Rbg, 1950 to 1983. The record is 98.3 mm (3.9 in) in 1954, marked on the chart; the median year is 50.3 mm (2.0 in).
Wettest day (Rx1day) at Hamilton Rbg by year
Year
Wettest day (Rx1day)
1950
78.5 mm (3.1 in)
1951
60.5 mm (2.4 in)
1952
43.7 mm (1.7 in)
1953
80.8 mm (3.2 in)
1954
98.3 mm (3.9 in)
1955
62.2 mm (2.4 in)
1956
78.2 mm (3.1 in)
1957
54.4 mm (2.1 in)
1958
53.1 mm (2.1 in)
1959
43.7 mm (1.7 in)
1960
40.9 mm (1.6 in)
1961
43.9 mm (1.7 in)
1962
89.2 mm (3.5 in)
1963
39.6 mm (1.6 in)
1964
57.4 mm (2.3 in)
1965
38.4 mm (1.5 in)
1966
34.5 mm (1.4 in)
1967
47.5 mm (1.9 in)
1968
57.2 mm (2.3 in)
1969
39.9 mm (1.6 in)
1970
26.4 mm (1.0 in)
1971
43.7 mm (1.7 in)
1972
44.7 mm (1.8 in)
1973
58.9 mm (2.3 in)
1974
38.1 mm (1.5 in)
1975
42.4 mm (1.7 in)
1976
78.7 mm (3.1 in)
1977
58.6 mm (2.3 in)
1978
54.6 mm (2.1 in)
1979
40.0 mm (1.6 in)
1980
30.0 mm (1.2 in)
1981
69.4 mm (2.7 in)
1982
93.8 mm (3.7 in)
1983
33.4 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hamilton Rbg, 1950 to 1983. The record is 136.0 mm (5.4 in) in 1981, marked on the chart; the median year is 78.1 mm (3.1 in).
Wettest five days (Rx5day) at Hamilton Rbg by year
Year
Wettest five days (Rx5day)
1950
110.3 mm (4.3 in)
1951
86.4 mm (3.4 in)
1952
65.8 mm (2.6 in)
1953
101.7 mm (4.0 in)
1954
125.5 mm (4.9 in)
1955
75.4 mm (3.0 in)
1956
127.3 mm (5.0 in)
1957
108.3 mm (4.3 in)
1958
77.3 mm (3.0 in)
1959
82.8 mm (3.3 in)
1960
62.5 mm (2.5 in)
1961
93.5 mm (3.7 in)
1962
89.2 mm (3.5 in)
1963
54.6 mm (2.1 in)
1964
101.0 mm (4.0 in)
1965
68.8 mm (2.7 in)
1966
76.6 mm (3.0 in)
1967
66.5 mm (2.6 in)
1968
65.6 mm (2.6 in)
1969
54.9 mm (2.2 in)
1970
37.8 mm (1.5 in)
1971
69.8 mm (2.7 in)
1972
62.5 mm (2.5 in)
1973
120.9 mm (4.8 in)
1974
73.1 mm (2.9 in)
1975
54.4 mm (2.1 in)
1976
89.1 mm (3.5 in)
1977
78.8 mm (3.1 in)
1978
100.4 mm (4.0 in)
1979
83.2 mm (3.3 in)
1980
53.4 mm (2.1 in)
1981
136.0 mm (5.4 in)
1982
97.4 mm (3.8 in)
1983
63.0 mm (2.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hamilton Rbg, 1950 to 1983. The record is 35 days in 1956, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Hamilton Rbg by year
Year
Longest dry spell (CDD)
1950
16 days
1951
14 days
1952
15 days
1953
15 days
1954
16 days
1955
14 days
1956
35 days
1957
24 days
1958
14 days
1959
14 days
1960
18 days
1961
28 days
1962
24 days
1963
31 days
1964
20 days
1965
19 days
1966
20 days
1967
21 days
1968
19 days
1969
19 days
1970
19 days
1971
17 days
1972
17 days
1973
27 days
1974
12 days
1975
16 days
1976
24 days
1977
15 days
1978
17 days
1979
16 days
1980
11 days
1981
15 days
1982
17 days
1983
18 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
33 years with a frost
Across 33 years with a frost, the median last spring frost at Hamilton Rbg falls on 29 April and the median first autumn frost on 17 October, which leaves a median of 168 days between them.
Fitted over all years, the growing season changes by +4.5 days per decade at this station.
Frost dates and growing season at Hamilton Rbg
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
29 April
n/a
2 May
n/a
-2.0 days per decade
First autumn frost
17 October
n/a
17 October
n/a
+2.4 days per decade
Growing days
168 days
n/a
168 days
n/a
+4.5 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
33 years, 1951 to 1983
A day with at least 49.7 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 122.3 mm (4.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Hamilton Rbg: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
49.7 mm (2.0 in)
5 years
66.6 mm (2.6 in)
10 years
78.8 mm (3.1 in)
25 years
95.3 mm (3.8 in)
50 years
108.4 mm (4.3 in)
Longer than the 33 years of record
100 years
122.3 mm (4.8 in)
Longer than the 33 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, 33 years of values from 1951 to 1983.
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: 98.3 mm (3.9 in) in 1954; 93.8 mm (3.7 in) in 1982; 89.2 mm (3.5 in) in 1962.
Download the Data
Data for Hamilton Rbg standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hamilton Rbg 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.