Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at St Hyacinthe. 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 St Hyacinthe, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.8 C (55.0 F)
-39.4 C (-38.9 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Apr
30.0 C (86.0 F)
-16.1 C (3.0 F)
n/a
n/a
May
32.8 C (91.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
36.1 C (97.0 F)
3.9 C (39.0 F)
n/a
n/a
Aug
35.6 C (96.1 F)
2.8 C (37.0 F)
n/a
n/a
Sep
32.8 C (91.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-33.9 C (-29.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at St Hyacinthe still stand. 1936 holds the most, with 53.
Standing records at St Hyacinthe by the year they were set
Year set
Standing records
1890
17
1891
35
1892
29
1893
32
1894
26
1895
14
1935
27
1936
53
1937
23
1938
47
1939
34
1940
46
1941
25
1942
38
1943
36
1944
26
1945
42
1946
45
1947
48
1948
32
1949
44
1950
35
1951
33
1952
13
1953
26
1954
25
1955
21
1956
28
1957
32
1958
12
1959
21
1960
18
1961
19
1962
22
1963
28
1964
30
1965
23
1966
27
1967
13
1968
33
1969
13
1970
24
1971
21
1972
20
1973
24
1974
23
1975
30
1976
30
1977
34
1978
21
1979
46
All-Time Record Progression
1 new records
1 all-time records were set at St Hyacinthe between 15 December 1968 and 15 December 1968. Each dot is a new record.
When St Hyacinthe set new all-time records
Date
Kind
Detail
1968-12-15
Record daily snowfall
Record daily snowfall 53.3 cm (21.0 in)
Wettest Day of Each Month
Jun: 81.5 mm (3.2 in)
The wettest day on record for each calendar month at St Hyacinthe. The most was 81.5 mm (3.2 in) on 15 June 1943.
Record daily precipitation for each month at St Hyacinthe
Month
Record daily precipitation (mm)
Date
Jan
60.5 mm (2.4 in)
21 January 1974
Feb
49.5 mm (1.9 in)
6 February 1893
Mar
69.9 mm (2.8 in)
12 March 1893
Apr
41.4 mm (1.6 in)
2 April 1970
May
48.0 mm (1.9 in)
17 May 1945
Jun
81.5 mm (3.2 in)
15 June 1943
Jul
67.3 mm (2.6 in)
20 July 1975
Aug
78.0 mm (3.1 in)
22 August 1955
Sep
57.4 mm (2.3 in)
14 September 1979
Oct
51.6 mm (2.0 in)
2 October 1952
Nov
48.3 mm (1.9 in)
4 November 1950
Dec
53.3 mm (2.1 in)
15 December 1968
Period of Record Coverage
1890 to 1979
Complete yearUnder 90 percent of days
51 years of record at St Hyacinthe, 1890 to 1979. 2 years have data for under 90 percent of days and are left out of rankings: 1890, 1895.
Cooler than the station meanWarmer than the station mean
One stripe for each of 48 complete years at St Hyacinthe, 1891 to 1979. Blue stripes are years cooler than the station's own mean of 6.0 C (42.8 F); red stripes are warmer. The coolest year was 1940, at 4.4 C (39.9 F), and the warmest was 1953, at 7.7 C (45.9 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at St Hyacinthe as warming stripes, 1891 to 1979
Year
Annual mean temperature
Difference from the station mean
1891
6.8 C
+0.78 C
1892
5.6 C
-0.34 C
1893
5.0 C
-1.01 C
1894
6.6 C
+0.59 C
1935
4.8 C
-1.14 C
1936
4.7 C
-1.28 C
1937
6.3 C
+0.33 C
1938
5.7 C
-0.32 C
1939
4.9 C
-1.09 C
1940
4.4 C
-1.59 C
1941
5.7 C
-0.30 C
1942
6.0 C
+0.04 C
1943
4.4 C
-1.54 C
1944
5.4 C
-0.61 C
1945
5.7 C
-0.25 C
1946
6.3 C
+0.27 C
1947
5.8 C
-0.18 C
1948
6.1 C
+0.12 C
1949
6.8 C
+0.86 C
1950
5.8 C
-0.18 C
1951
6.2 C
+0.24 C
1952
6.6 C
+0.65 C
1953
7.7 C
+1.74 C
1954
5.7 C
-0.27 C
1955
6.1 C
+0.07 C
1956
5.5 C
-0.52 C
1957
6.6 C
+0.61 C
1958
5.4 C
-0.55 C
1959
6.2 C
+0.23 C
1960
6.4 C
+0.39 C
1961
6.3 C
+0.28 C
1962
5.5 C
-0.52 C
1963
5.6 C
-0.43 C
1964
7.0 C
+1.02 C
1965
6.1 C
+0.09 C
1966
6.7 C
+0.69 C
1967
5.9 C
-0.07 C
1968
5.9 C
-0.09 C
1969
6.3 C
+0.32 C
1970
5.8 C
-0.15 C
1971
5.9 C
-0.09 C
1972
5.4 C
-0.59 C
1973
7.4 C
+1.46 C
1974
6.1 C
+0.07 C
1975
7.2 C
+1.18 C
1976
5.5 C
-0.47 C
1977
6.5 C
+0.47 C
1979
6.8 C
+0.85 C
The fitted trend in annual mean temperature here over 1891 to 1979 is 0.08 C (-0.01 to 0.18) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.15 F (-0.03 to 0.32) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at St Hyacinthe
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.08 C (-0.01 to 0.18) per decade
0.15 F (-0.03 to 0.32) per decade
1891 to 1979
48
Not clearly different from zero
Mean daily maximum
-0.05 C (-0.15 to 0.05) per decade
-0.1 F (-0.3 to 0.1) per decade
1891 to 1979
48
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1891 to 1979
48
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
1890 to 1979
Yearly extremes at St Hyacinthe: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
1953
33.3 C (91.9 F)
51
Coldest night (TNn)
-39.4 C (-38.9 F)
1957
-30.6 C (-23.1 F)
51
Wettest day (Rx1day)
81.5 mm (3.2 in)
1943
45.2 mm (1.8 in)
51
Wettest five days (Rx5day)
122.0 mm (4.8 in)
1893
74.6 mm (2.9 in)
51
Longest dry spell (CDD)
30 days
1947
14 days
51
Hottest day (TXx)
The hottest day of the year at St Hyacinthe, 1890 to 1979. The record is 36.1 C (97.0 F) in 1953, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at St Hyacinthe by year
Year
Hottest day (TXx)
1890
32.2 C (90.0 F)
1891
32.2 C (90.0 F)
1892
31.7 C (89.1 F)
1893
33.3 C (91.9 F)
1894
33.3 C (91.9 F)
1895
32.8 C (91.0 F)
1935
33.3 C (91.9 F)
1936
34.4 C (93.9 F)
1937
32.8 C (91.0 F)
1938
34.4 C (93.9 F)
1939
33.3 C (91.9 F)
1940
33.9 C (93.0 F)
1941
35.0 C (95.0 F)
1942
32.8 C (91.0 F)
1943
32.2 C (90.0 F)
1944
35.6 C (96.1 F)
1945
32.8 C (91.0 F)
1946
33.9 C (93.0 F)
1947
34.4 C (93.9 F)
1948
35.0 C (95.0 F)
1949
34.4 C (93.9 F)
1950
32.2 C (90.0 F)
1951
31.1 C (88.0 F)
1952
33.3 C (91.9 F)
1953
36.1 C (97.0 F)
1954
31.1 C (88.0 F)
1955
35.0 C (95.0 F)
1956
33.3 C (91.9 F)
1957
32.8 C (91.0 F)
1958
30.0 C (86.0 F)
1959
34.4 C (93.9 F)
1960
33.3 C (91.9 F)
1961
31.7 C (89.1 F)
1962
32.8 C (91.0 F)
1963
35.0 C (95.0 F)
1964
35.6 C (96.1 F)
1965
33.3 C (91.9 F)
1966
32.8 C (91.0 F)
1967
32.8 C (91.0 F)
1968
32.8 C (91.0 F)
1969
32.2 C (90.0 F)
1970
34.4 C (93.9 F)
1971
34.4 C (93.9 F)
1972
32.2 C (90.0 F)
1973
32.2 C (90.0 F)
1974
30.0 C (86.0 F)
1975
35.6 C (96.1 F)
1976
31.1 C (88.0 F)
1977
33.9 C (93.0 F)
1978
32.8 C (91.0 F)
1979
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at St Hyacinthe, 1890 to 1979. The record is -39.4 C (-38.9 F) in 1957, marked on the chart; the median year is -30.6 C (-23.1 F).
Coldest night (TNn) at St Hyacinthe by year
Year
Coldest night (TNn)
1890
-30.0 C (-22.0 F)
1891
-31.1 C (-24.0 F)
1892
-33.9 C (-29.0 F)
1893
-33.3 C (-27.9 F)
1894
-31.1 C (-24.0 F)
1895
-31.7 C (-25.1 F)
1935
-30.6 C (-23.1 F)
1936
-34.4 C (-29.9 F)
1937
-27.8 C (-18.0 F)
1938
-37.8 C (-36.0 F)
1939
-31.1 C (-24.0 F)
1940
-28.3 C (-18.9 F)
1941
-28.3 C (-18.9 F)
1942
-32.2 C (-26.0 F)
1943
-33.3 C (-27.9 F)
1944
-29.4 C (-20.9 F)
1945
-34.4 C (-29.9 F)
1946
-30.0 C (-22.0 F)
1947
-32.2 C (-26.0 F)
1948
-32.8 C (-27.0 F)
1949
-27.2 C (-17.0 F)
1950
-30.0 C (-22.0 F)
1951
-36.7 C (-34.1 F)
1952
-29.4 C (-20.9 F)
1953
-26.7 C (-16.1 F)
1954
-33.9 C (-29.0 F)
1955
-33.3 C (-27.9 F)
1956
-27.8 C (-18.0 F)
1957
-39.4 C (-38.9 F)
1958
-30.6 C (-23.1 F)
1959
-30.6 C (-23.1 F)
1960
-31.7 C (-25.1 F)
1961
-28.9 C (-20.0 F)
1962
-35.0 C (-31.0 F)
1963
-31.7 C (-25.1 F)
1964
-27.8 C (-18.0 F)
1965
-30.0 C (-22.0 F)
1966
-30.0 C (-22.0 F)
1967
-33.9 C (-29.0 F)
1968
-30.6 C (-23.1 F)
1969
-25.0 C (-13.0 F)
1970
-33.9 C (-29.0 F)
1971
-33.9 C (-29.0 F)
1972
-32.2 C (-26.0 F)
1973
-30.0 C (-22.0 F)
1974
-28.9 C (-20.0 F)
1975
-29.4 C (-20.9 F)
1976
-33.9 C (-29.0 F)
1977
-26.1 C (-15.0 F)
1978
-29.4 C (-20.9 F)
1979
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at St Hyacinthe, 1890 to 1979. The record is 81.5 mm (3.2 in) in 1943, marked on the chart; the median year is 45.2 mm (1.8 in).
Wettest day (Rx1day) at St Hyacinthe by year
Year
Wettest day (Rx1day)
1890
50.8 mm (2.0 in)
1891
72.9 mm (2.9 in)
1892
47.5 mm (1.9 in)
1893
70.1 mm (2.8 in)
1894
30.7 mm (1.2 in)
1895
30.2 mm (1.2 in)
1935
27.9 mm (1.1 in)
1936
46.2 mm (1.8 in)
1937
49.8 mm (2.0 in)
1938
49.3 mm (1.9 in)
1939
36.1 mm (1.4 in)
1940
30.5 mm (1.2 in)
1941
34.8 mm (1.4 in)
1942
45.2 mm (1.8 in)
1943
81.5 mm (3.2 in)
1944
35.6 mm (1.4 in)
1945
48.0 mm (1.9 in)
1946
41.7 mm (1.6 in)
1947
45.2 mm (1.8 in)
1948
47.8 mm (1.9 in)
1949
50.0 mm (2.0 in)
1950
48.3 mm (1.9 in)
1951
31.0 mm (1.2 in)
1952
51.6 mm (2.0 in)
1953
35.8 mm (1.4 in)
1954
62.0 mm (2.4 in)
1955
78.0 mm (3.1 in)
1956
28.7 mm (1.1 in)
1957
39.1 mm (1.5 in)
1958
39.1 mm (1.5 in)
1959
26.2 mm (1.0 in)
1960
40.9 mm (1.6 in)
1961
56.9 mm (2.2 in)
1962
27.4 mm (1.1 in)
1963
43.9 mm (1.7 in)
1964
42.4 mm (1.7 in)
1965
42.4 mm (1.7 in)
1966
36.3 mm (1.4 in)
1967
52.8 mm (2.1 in)
1968
53.3 mm (2.1 in)
1969
45.7 mm (1.8 in)
1970
41.4 mm (1.6 in)
1971
35.6 mm (1.4 in)
1972
56.1 mm (2.2 in)
1973
35.3 mm (1.4 in)
1974
60.5 mm (2.4 in)
1975
67.3 mm (2.6 in)
1976
55.9 mm (2.2 in)
1977
45.2 mm (1.8 in)
1978
63.8 mm (2.5 in)
1979
57.4 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at St Hyacinthe, 1890 to 1979. The record is 122.0 mm (4.8 in) in 1893, marked on the chart; the median year is 74.6 mm (2.9 in).
Wettest five days (Rx5day) at St Hyacinthe by year
Year
Wettest five days (Rx5day)
1890
76.2 mm (3.0 in)
1891
116.8 mm (4.6 in)
1892
109.3 mm (4.3 in)
1893
122.0 mm (4.8 in)
1894
52.3 mm (2.1 in)
1895
49.4 mm (1.9 in)
1935
50.5 mm (2.0 in)
1936
62.7 mm (2.5 in)
1937
81.1 mm (3.2 in)
1938
80.3 mm (3.2 in)
1939
57.5 mm (2.3 in)
1940
43.6 mm (1.7 in)
1941
120.3 mm (4.7 in)
1942
59.3 mm (2.3 in)
1943
110.2 mm (4.3 in)
1944
74.6 mm (2.9 in)
1945
77.3 mm (3.0 in)
1946
91.7 mm (3.6 in)
1947
76.2 mm (3.0 in)
1948
60.5 mm (2.4 in)
1949
81.8 mm (3.2 in)
1950
54.4 mm (2.1 in)
1951
49.6 mm (2.0 in)
1952
91.8 mm (3.6 in)
1953
83.6 mm (3.3 in)
1954
73.4 mm (2.9 in)
1955
99.1 mm (3.9 in)
1956
43.7 mm (1.7 in)
1957
68.6 mm (2.7 in)
1958
67.8 mm (2.7 in)
1959
55.7 mm (2.2 in)
1960
77.2 mm (3.0 in)
1961
86.4 mm (3.4 in)
1962
56.3 mm (2.2 in)
1963
60.2 mm (2.4 in)
1964
66.1 mm (2.6 in)
1965
78.0 mm (3.1 in)
1966
59.7 mm (2.4 in)
1967
66.8 mm (2.6 in)
1968
70.8 mm (2.8 in)
1969
77.2 mm (3.0 in)
1970
58.1 mm (2.3 in)
1971
67.9 mm (2.7 in)
1972
97.3 mm (3.8 in)
1973
70.4 mm (2.8 in)
1974
113.7 mm (4.5 in)
1975
98.8 mm (3.9 in)
1976
87.6 mm (3.4 in)
1977
57.4 mm (2.3 in)
1978
104.0 mm (4.1 in)
1979
78.5 mm (3.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at St Hyacinthe, 1890 to 1979. The record is 30 days in 1947, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at St Hyacinthe by year
Year
Longest dry spell (CDD)
1890
20 days
1891
11 days
1892
17 days
1893
17 days
1894
28 days
1895
14 days
1935
10 days
1936
12 days
1937
12 days
1938
12 days
1939
21 days
1940
12 days
1941
24 days
1942
13 days
1943
10 days
1944
13 days
1945
17 days
1946
10 days
1947
30 days
1948
15 days
1949
12 days
1950
14 days
1951
13 days
1952
11 days
1953
15 days
1954
10 days
1955
15 days
1956
15 days
1957
18 days
1958
14 days
1959
14 days
1960
13 days
1961
17 days
1962
12 days
1963
20 days
1964
15 days
1965
19 days
1966
11 days
1967
18 days
1968
18 days
1969
11 days
1970
12 days
1971
19 days
1972
13 days
1973
13 days
1974
10 days
1975
18 days
1976
10 days
1977
14 days
1978
18 days
1979
14 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
48 years with a frost
Across 48 years with a frost, the median last spring frost at St Hyacinthe falls on 11 May and the median first autumn frost on 3 October, which leaves a median of 146 days between them.
Fitted over all years, the growing season changes by +2.0 days per decade at this station.
Frost dates and growing season at St Hyacinthe
Measure
Median, all years
Earliest period
Recent period (1949 to 1979)
Recent against earliest
Fitted trend
Last spring frost
11 May
n/a
11 May
n/a
-0.6 days per decade
First autumn frost
3 October
n/a
9 October
n/a
+1.5 days per decade
Growing days
146 days
n/a
152 days
n/a
+2.0 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
48 years, 1891 to 1979
A day with at least 45.2 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 87.0 mm (3.4 in) of rain is expected about once in 100 years.
Rainfall return levels at St Hyacinthe: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.2 mm (1.8 in)
5 years
57.3 mm (2.3 in)
10 years
65.0 mm (2.6 in)
25 years
74.2 mm (2.9 in)
50 years
80.8 mm (3.2 in)
Longer than the 48 years of record
100 years
87.0 mm (3.4 in)
Longer than the 48 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, 48 years of values from 1891 to 1979.
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: 81.5 mm (3.2 in) in 1943; 78.0 mm (3.1 in) in 1955; 72.9 mm (2.9 in) in 1891.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of St Hyacinthe, at 1946. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1946 ran 0.3 C (0.5 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at St Hyacinthe, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1946
+0.3
+0.5
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for St Hyacinthe standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St Hyacinthe 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.