Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at L'Assomption. 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 L'Assomption, 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)
-43.3 C (-45.9 F)
n/a
n/a
Feb
11.0 C (51.8 F)
-43.3 C (-45.9 F)
n/a
n/a
Mar
23.3 C (73.9 F)
-40.6 C (-41.1 F)
n/a
n/a
Apr
29.4 C (84.9 F)
-19.4 C (-2.9 F)
n/a
n/a
May
33.3 C (91.9 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
37.2 C (99.0 F)
3.3 C (37.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
0.6 C (33.1 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-5.5 C (22.1 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-12.2 C (10.0 F)
n/a
n/a
Nov
21.7 C (71.1 F)
-25.0 C (-13.0 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-42.8 C (-45.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at L'Assomption still stand. 1979 holds the most, with 46.
Standing records at L'Assomption by the year they were set
Year set
Standing records
1930
27
1931
31
1932
37
1933
40
1934
43
1935
25
1936
44
1937
23
1938
30
1939
29
1940
36
1941
23
1942
35
1943
35
1944
26
1945
39
1946
41
1947
39
1948
37
1949
40
1950
31
1951
27
1952
9
1953
32
1954
14
1955
18
1956
29
1957
29
1958
15
1959
27
1960
11
1961
18
1962
20
1963
25
1964
27
1965
28
1966
26
1967
13
1968
31
1969
19
1970
22
1971
23
1972
13
1973
17
1974
21
1975
19
1976
24
1977
34
1978
18
1979
46
1980
16
1981
36
1982
32
1983
14
All-Time Record Progression
2 new records
2 all-time records were set at L'Assomption between 3 April 1975 and 19 June 1978. Each dot is a new record.
When L'Assomption set new all-time records
Date
Kind
Detail
1975-04-03
Record daily snowfall
Record daily snowfall 39.6 cm (15.6 in)
1978-06-19
Record daily precipitation
Record daily precipitation 103.1 mm (4.1 in)
Wettest Day of Each Month
Jun: 103.1 mm (4.1 in)
The wettest day on record for each calendar month at L'Assomption. The most was 103.1 mm (4.1 in) on 19 June 1978.
Record daily precipitation for each month at L'Assomption
Month
Record daily precipitation (mm)
Date
Jan
62.7 mm (2.5 in)
8 January 1978
Feb
43.4 mm (1.7 in)
2 February 1983
Mar
39.6 mm (1.6 in)
19 March 1975
Apr
42.2 mm (1.7 in)
16 April 1954
May
49.8 mm (2.0 in)
17 May 1945
Jun
103.1 mm (4.1 in)
19 June 1978
Jul
65.0 mm (2.6 in)
22 July 1935
Aug
69.3 mm (2.7 in)
17 August 1938
Sep
77.7 mm (3.1 in)
14 September 1979
Oct
65.0 mm (2.6 in)
6 October 1932
Nov
61.0 mm (2.4 in)
4 November 1983
Dec
46.5 mm (1.8 in)
20 December 1973
Period of Record Coverage
1930 to 1983
Complete yearUnder 90 percent of days
54 years of record at L'Assomption, 1930 to 1983. Every year has data for at least 90 percent of its days.
Cooler than the station meanWarmer than the station mean
One stripe for each of 54 complete years at L'Assomption, 1930 to 1983. Blue stripes are years cooler than the station's own mean of 5.2 C (41.3 F); red stripes are warmer. The coolest year was 1934, at 3.8 C (38.9 F), and the warmest was 1953, at 7.1 C (44.7 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at L'Assomption as warming stripes, 1930 to 1983
Year
Annual mean temperature
Difference from the station mean
1930
5.5 C
+0.31 C
1931
6.5 C
+1.32 C
1932
5.6 C
+0.37 C
1933
4.7 C
-0.45 C
1934
3.8 C
-1.38 C
1935
4.3 C
-0.94 C
1936
4.1 C
-1.05 C
1937
5.7 C
+0.53 C
1938
5.3 C
+0.13 C
1939
4.6 C
-0.63 C
1940
4.2 C
-0.98 C
1941
5.5 C
+0.34 C
1942
5.7 C
+0.51 C
1943
3.9 C
-1.28 C
1944
5.2 C
-0.02 C
1945
5.4 C
+0.20 C
1946
5.7 C
+0.54 C
1947
5.3 C
+0.07 C
1948
5.4 C
+0.20 C
1949
6.7 C
+1.46 C
1950
5.2 C
+0.03 C
1951
5.3 C
+0.14 C
1952
6.1 C
+0.93 C
1953
7.1 C
+1.88 C
1954
5.1 C
-0.13 C
1955
5.5 C
+0.33 C
1956
4.9 C
-0.33 C
1957
6.0 C
+0.84 C
1958
4.8 C
-0.42 C
1959
5.2 C
+0.03 C
1960
5.6 C
+0.44 C
1961
5.4 C
+0.22 C
1962
4.5 C
-0.65 C
1963
4.5 C
-0.74 C
1964
5.5 C
+0.30 C
1965
4.8 C
-0.38 C
1966
5.4 C
+0.24 C
1967
4.6 C
-0.57 C
1968
4.8 C
-0.40 C
1969
5.3 C
+0.13 C
1970
4.8 C
-0.44 C
1971
4.6 C
-0.59 C
1972
4.1 C
-1.11 C
1973
6.2 C
+1.04 C
1974
4.7 C
-0.50 C
1975
5.8 C
+0.58 C
1976
4.3 C
-0.93 C
1977
5.5 C
+0.35 C
1978
4.4 C
-0.78 C
1979
5.8 C
+0.57 C
1980
4.6 C
-0.57 C
1981
5.9 C
+0.75 C
1982
4.9 C
-0.32 C
1983
5.9 C
+0.74 C
The fitted trend in annual mean temperature here over 1930 to 1983 is 0.00 C (-0.13 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.01 F (-0.23 to 0.22) 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 L'Assomption
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.00 C (-0.13 to 0.12) per decade
-0.01 F (-0.23 to 0.22) per decade
1930 to 1983
54
Not clearly different from zero
Mean daily maximum
-0.16 C (-0.29 to -0.04) per decade
-0.3 F (-0.5 to -0.1) per decade
1930 to 1983
54
Fall
Mean daily minimum
0.15 C (0.02 to 0.29) per decade
0.28 F (0.03 to 0.52) per decade
1930 to 1983
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
1930 to 1983
Yearly extremes at L'Assomption: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.2 C (99.0 F)
1944
33.3 C (91.9 F)
54
Coldest night (TNn)
-43.3 C (-45.9 F)
1934
-35.6 C (-32.1 F)
54
Wettest day (Rx1day)
103.1 mm (4.1 in)
1978
44.6 mm (1.8 in)
54
Wettest five days (Rx5day)
132.0 mm (5.2 in)
1978
68.1 mm (2.7 in)
54
Longest dry spell (CDD)
35 days
1961
16 days
54
Hottest day (TXx)
The hottest day of the year at L'Assomption, 1930 to 1983. The record is 37.2 C (99.0 F) in 1944, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at L'Assomption by year
Year
Hottest day (TXx)
1930
31.7 C (89.1 F)
1931
36.7 C (98.1 F)
1932
32.8 C (91.0 F)
1933
35.0 C (95.0 F)
1934
33.9 C (93.0 F)
1935
34.4 C (93.9 F)
1936
32.8 C (91.0 F)
1937
33.3 C (91.9 F)
1938
35.6 C (96.1 F)
1939
33.3 C (91.9 F)
1940
32.2 C (90.0 F)
1941
36.1 C (97.0 F)
1942
33.3 C (91.9 F)
1943
33.3 C (91.9 F)
1944
37.2 C (99.0 F)
1945
32.8 C (91.0 F)
1946
34.4 C (93.9 F)
1947
35.6 C (96.1 F)
1948
34.4 C (93.9 F)
1949
36.1 C (97.0 F)
1950
32.2 C (90.0 F)
1951
31.1 C (88.0 F)
1952
32.8 C (91.0 F)
1953
37.2 C (99.0 F)
1954
30.6 C (87.1 F)
1955
35.6 C (96.1 F)
1956
35.0 C (95.0 F)
1957
32.8 C (91.0 F)
1958
31.1 C (88.0 F)
1959
34.4 C (93.9 F)
1960
31.7 C (89.1 F)
1961
31.1 C (88.0 F)
1962
32.8 C (91.0 F)
1963
35.0 C (95.0 F)
1964
35.0 C (95.0 F)
1965
33.3 C (91.9 F)
1966
33.9 C (93.0 F)
1967
31.7 C (89.1 F)
1968
32.8 C (91.0 F)
1969
32.2 C (90.0 F)
1970
33.3 C (91.9 F)
1971
33.9 C (93.0 F)
1972
31.1 C (88.0 F)
1973
32.2 C (90.0 F)
1974
30.0 C (86.0 F)
1975
36.1 C (97.0 F)
1976
32.2 C (90.0 F)
1977
33.3 C (91.9 F)
1978
32.8 C (91.0 F)
1979
32.8 C (91.0 F)
1980
32.0 C (89.6 F)
1981
33.5 C (92.3 F)
1982
33.5 C (92.3 F)
1983
34.5 C (94.1 F)
Coldest night (TNn)
The coldest night of the year at L'Assomption, 1930 to 1983. The record is -43.3 C (-45.9 F) in 1934, marked on the chart; the median year is -35.6 C (-32.1 F).
Coldest night (TNn) at L'Assomption by year
Year
Coldest night (TNn)
1930
-40.0 C (-40.0 F)
1931
-40.0 C (-40.0 F)
1932
-33.3 C (-27.9 F)
1933
-42.8 C (-45.0 F)
1934
-43.3 C (-45.9 F)
1935
-41.1 C (-42.0 F)
1936
-38.3 C (-36.9 F)
1937
-34.4 C (-29.9 F)
1938
-40.6 C (-41.1 F)
1939
-33.9 C (-29.0 F)
1940
-35.0 C (-31.0 F)
1941
-33.9 C (-29.0 F)
1942
-36.1 C (-33.0 F)
1943
-37.8 C (-36.0 F)
1944
-35.0 C (-31.0 F)
1945
-36.1 C (-33.0 F)
1946
-34.4 C (-29.9 F)
1947
-33.9 C (-29.0 F)
1948
-38.3 C (-36.9 F)
1949
-31.1 C (-24.0 F)
1950
-35.0 C (-31.0 F)
1951
-38.9 C (-38.0 F)
1952
-37.8 C (-36.0 F)
1953
-26.1 C (-15.0 F)
1954
-35.6 C (-32.1 F)
1955
-36.7 C (-34.1 F)
1956
-30.0 C (-22.0 F)
1957
-43.3 C (-45.9 F)
1958
-35.0 C (-31.0 F)
1959
-36.1 C (-33.0 F)
1960
-34.4 C (-29.9 F)
1961
-35.0 C (-31.0 F)
1962
-37.8 C (-36.0 F)
1963
-37.2 C (-35.0 F)
1964
-33.9 C (-29.0 F)
1965
-32.8 C (-27.0 F)
1966
-35.6 C (-32.1 F)
1967
-36.7 C (-34.1 F)
1968
-35.6 C (-32.1 F)
1969
-27.8 C (-18.0 F)
1970
-35.6 C (-32.1 F)
1971
-40.6 C (-41.1 F)
1972
-37.2 C (-35.0 F)
1973
-33.3 C (-27.9 F)
1974
-35.6 C (-32.1 F)
1975
-34.4 C (-29.9 F)
1976
-38.9 C (-38.0 F)
1977
-32.8 C (-27.0 F)
1978
-32.8 C (-27.0 F)
1979
-35.0 C (-31.0 F)
1980
-34.0 C (-29.2 F)
1981
-38.0 C (-36.4 F)
1982
-37.5 C (-35.5 F)
1983
-33.5 C (-28.3 F)
Wettest day (Rx1day)
The wettest day of the year at L'Assomption, 1930 to 1983. The record is 103.1 mm (4.1 in) in 1978, marked on the chart; the median year is 44.6 mm (1.8 in).
Wettest day (Rx1day) at L'Assomption by year
Year
Wettest day (Rx1day)
1930
41.1 mm (1.6 in)
1931
30.5 mm (1.2 in)
1932
68.6 mm (2.7 in)
1933
52.6 mm (2.1 in)
1934
39.6 mm (1.6 in)
1935
65.0 mm (2.6 in)
1936
33.0 mm (1.3 in)
1937
39.6 mm (1.6 in)
1938
69.3 mm (2.7 in)
1939
40.9 mm (1.6 in)
1940
44.5 mm (1.8 in)
1941
52.3 mm (2.1 in)
1942
42.2 mm (1.7 in)
1943
61.5 mm (2.4 in)
1944
42.2 mm (1.7 in)
1945
49.8 mm (2.0 in)
1946
54.6 mm (2.1 in)
1947
43.2 mm (1.7 in)
1948
48.0 mm (1.9 in)
1949
48.0 mm (1.9 in)
1950
57.7 mm (2.3 in)
1951
35.6 mm (1.4 in)
1952
58.2 mm (2.3 in)
1953
30.5 mm (1.2 in)
1954
64.3 mm (2.5 in)
1955
43.4 mm (1.7 in)
1956
42.2 mm (1.7 in)
1957
42.7 mm (1.7 in)
1958
31.5 mm (1.2 in)
1959
35.8 mm (1.4 in)
1960
44.2 mm (1.7 in)
1961
59.9 mm (2.4 in)
1962
33.0 mm (1.3 in)
1963
65.0 mm (2.6 in)
1964
43.9 mm (1.7 in)
1965
29.7 mm (1.2 in)
1966
51.8 mm (2.0 in)
1967
31.5 mm (1.2 in)
1968
43.2 mm (1.7 in)
1969
40.9 mm (1.6 in)
1970
50.0 mm (2.0 in)
1971
27.4 mm (1.1 in)
1972
44.7 mm (1.8 in)
1973
59.9 mm (2.4 in)
1974
41.1 mm (1.6 in)
1975
48.0 mm (1.9 in)
1976
47.0 mm (1.9 in)
1977
65.0 mm (2.6 in)
1978
103.1 mm (4.1 in)
1979
77.7 mm (3.1 in)
1980
43.4 mm (1.7 in)
1981
47.3 mm (1.9 in)
1982
58.4 mm (2.3 in)
1983
61.0 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at L'Assomption, 1930 to 1983. The record is 132.0 mm (5.2 in) in 1978, marked on the chart; the median year is 68.1 mm (2.7 in).
Wettest five days (Rx5day) at L'Assomption by year
Year
Wettest five days (Rx5day)
1930
71.1 mm (2.8 in)
1931
40.2 mm (1.6 in)
1932
88.4 mm (3.5 in)
1933
83.3 mm (3.3 in)
1934
63.5 mm (2.5 in)
1935
84.3 mm (3.3 in)
1936
64.3 mm (2.5 in)
1937
70.4 mm (2.8 in)
1938
85.5 mm (3.4 in)
1939
68.5 mm (2.7 in)
1940
61.2 mm (2.4 in)
1941
68.3 mm (2.7 in)
1942
57.4 mm (2.3 in)
1943
114.1 mm (4.5 in)
1944
73.7 mm (2.9 in)
1945
78.2 mm (3.1 in)
1946
97.8 mm (3.9 in)
1947
67.8 mm (2.7 in)
1948
63.2 mm (2.5 in)
1949
52.6 mm (2.1 in)
1950
112.3 mm (4.4 in)
1951
54.9 mm (2.2 in)
1952
78.2 mm (3.1 in)
1953
51.9 mm (2.0 in)
1954
78.1 mm (3.1 in)
1955
58.4 mm (2.3 in)
1956
51.1 mm (2.0 in)
1957
73.8 mm (2.9 in)
1958
65.5 mm (2.6 in)
1959
56.3 mm (2.2 in)
1960
64.0 mm (2.5 in)
1961
82.2 mm (3.2 in)
1962
39.0 mm (1.5 in)
1963
70.7 mm (2.8 in)
1964
63.7 mm (2.5 in)
1965
51.1 mm (2.0 in)
1966
55.9 mm (2.2 in)
1967
47.7 mm (1.9 in)
1968
62.8 mm (2.5 in)
1969
75.2 mm (3.0 in)
1970
59.5 mm (2.3 in)
1971
59.7 mm (2.4 in)
1972
62.7 mm (2.5 in)
1973
91.0 mm (3.6 in)
1974
67.0 mm (2.6 in)
1975
77.0 mm (3.0 in)
1976
67.2 mm (2.6 in)
1977
80.5 mm (3.2 in)
1978
132.0 mm (5.2 in)
1979
93.9 mm (3.7 in)
1980
65.1 mm (2.6 in)
1981
69.6 mm (2.7 in)
1982
69.2 mm (2.7 in)
1983
130.0 mm (5.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at L'Assomption, 1930 to 1983. The record is 35 days in 1961, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at L'Assomption by year
Year
Longest dry spell (CDD)
1930
18 days
1931
19 days
1932
19 days
1933
22 days
1934
11 days
1935
17 days
1936
12 days
1937
13 days
1938
13 days
1939
24 days
1940
17 days
1941
25 days
1942
14 days
1943
12 days
1944
16 days
1945
16 days
1946
10 days
1947
16 days
1948
17 days
1949
17 days
1950
16 days
1951
15 days
1952
10 days
1953
16 days
1954
12 days
1955
17 days
1956
12 days
1957
23 days
1958
15 days
1959
11 days
1960
14 days
1961
35 days
1962
14 days
1963
19 days
1964
18 days
1965
19 days
1966
11 days
1967
17 days
1968
17 days
1969
11 days
1970
17 days
1971
12 days
1972
13 days
1973
16 days
1974
11 days
1975
18 days
1976
12 days
1977
15 days
1978
23 days
1979
16 days
1980
19 days
1981
14 days
1982
12 days
1983
11 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 L'Assomption falls on 16 May and the median first autumn frost on 23 September, which leaves a median of 130 days between them.
Fitted over all years, the growing season changes by +2.8 days per decade at this station.
Frost dates and growing season at L'Assomption
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
15 May
n/a
-1.5 days per decade
First autumn frost
23 September
n/a
24 September
n/a
+1.3 days per decade
Growing days
130 days
n/a
134 days
n/a
+2.8 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
54 years, 1930 to 1983
A day with at least 46.3 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 92.4 mm (3.6 in) of rain is expected about once in 100 years.
Rainfall return levels at L'Assomption: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
46.3 mm (1.8 in)
5 years
58.5 mm (2.3 in)
10 years
66.7 mm (2.6 in)
25 years
77.0 mm (3.0 in)
50 years
84.7 mm (3.3 in)
100 years
92.4 mm (3.6 in)
Longer than the 54 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, 54 years of values from 1930 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: 103.1 mm (4.1 in) in 1978; 77.7 mm (3.1 in) in 1979; 69.3 mm (2.7 in) in 1938.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for L'Assomption standing records by year: CSV or JSON. Field meanings are on the data page.
Data for L'Assomption 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.