Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Morrisburg. 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 Morrisburg, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Feb
15.0 C (59.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Mar
26.1 C (79.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-18.9 C (-2.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
37.8 C (100.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
37.2 C (99.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Oct
28.3 C (82.9 F)
-13.3 C (8.1 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Morrisburg still stand. 1981 holds the most, with 41.
Standing records at Morrisburg by the year they were set
Year set
Standing records
1913
11
1914
37
1915
15
1916
25
1917
34
1918
20
1919
25
1920
22
1921
33
1922
9
1923
20
1924
14
1925
19
1926
16
1927
12
1928
14
1929
15
1930
15
1931
19
1932
21
1933
27
1934
30
1935
14
1936
26
1937
16
1938
31
1939
15
1940
25
1941
18
1942
26
1943
16
1944
22
1945
33
1946
33
1947
29
1948
18
1949
34
1950
17
1951
18
1952
6
1953
22
1954
19
1955
17
1956
14
1957
19
1958
8
1959
29
1960
4
1961
10
1962
17
1963
15
1964
24
1965
22
1966
20
1967
10
1968
21
1969
13
1970
19
1971
15
1972
18
1973
24
1974
13
1975
20
1976
35
1977
22
1978
18
1979
36
1980
20
1981
41
1982
29
1983
20
All-Time Record Progression
2 new records
2 all-time records were set at Morrisburg between 14 February 1960 and 1 September 1973. Each dot is a new record.
When Morrisburg set new all-time records
Date
Kind
Detail
1960-02-14
Record daily snowfall
Record daily snowfall 50.8 cm (20.0 in)
1973-09-01
Record high minimum temperature
Record high minimum temperature 26.1 C (79.0 F)
Wettest Day of Each Month
Aug: 114.3 mm (4.5 in)
The wettest day on record for each calendar month at Morrisburg. The most was 114.3 mm (4.5 in) on 22 August 1915.
Record daily precipitation for each month at Morrisburg
Month
Record daily precipitation (mm)
Date
Jan
64.5 mm (2.5 in)
8 January 1978
Feb
50.8 mm (2.0 in)
14 February 1960
Mar
35.6 mm (1.4 in)
3 March 1947
Apr
41.9 mm (1.6 in)
12 April 1934
May
89.9 mm (3.5 in)
3 May 1916
Jun
90.2 mm (3.6 in)
5 June 1923
Jul
61.2 mm (2.4 in)
10 July 1952
Aug
114.3 mm (4.5 in)
22 August 1915
Sep
107.2 mm (4.2 in)
14 September 1979
Oct
62.2 mm (2.4 in)
24 October 1923
Nov
57.2 mm (2.3 in)
28 November 1976
Dec
51.6 mm (2.0 in)
30 December 1942
Period of Record Coverage
1913 to 1983
Complete yearUnder 90 percent of days
71 years of record at Morrisburg, 1913 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1913, 1914.
Cooler than the station meanWarmer than the station mean
One stripe for each of 68 complete years at Morrisburg, 1915 to 1983. 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 1917, at 3.5 C (38.2 F), and the warmest was 1953, at 8.2 C (46.8 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Morrisburg as warming stripes, 1915 to 1983
Year
Annual mean temperature
Difference from the station mean
1915
6.4 C
+0.41 C
1916
5.4 C
-0.55 C
1917
3.5 C
-2.52 C
1918
4.8 C
-1.17 C
1919
5.7 C
-0.31 C
1920
4.9 C
-1.13 C
1921
7.0 C
+0.99 C
1922
5.7 C
-0.30 C
1923
4.9 C
-1.05 C
1924
4.7 C
-1.26 C
1925
5.6 C
-0.39 C
1926
4.2 C
-1.82 C
1927
6.1 C
+0.14 C
1928
6.0 C
+0.05 C
1929
5.6 C
-0.35 C
1930
6.6 C
+0.58 C
1931
7.1 C
+1.14 C
1932
6.7 C
+0.67 C
1933
6.1 C
+0.08 C
1934
5.2 C
-0.82 C
1935
5.2 C
-0.74 C
1936
5.6 C
-0.38 C
1937
6.8 C
+0.86 C
1938
6.8 C
+0.77 C
1939
5.6 C
-0.35 C
1940
5.0 C
-0.95 C
1941
6.4 C
+0.40 C
1942
6.9 C
+0.90 C
1943
5.7 C
-0.33 C
1944
6.8 C
+0.81 C
1945
6.5 C
+0.52 C
1946
7.0 C
+1.02 C
1947
6.6 C
+0.64 C
1948
6.8 C
+0.86 C
1949
7.7 C
+1.73 C
1950
6.3 C
+0.27 C
1951
6.7 C
+0.73 C
1953
8.2 C
+2.25 C
1954
6.5 C
+0.50 C
1955
7.0 C
+1.01 C
1956
6.0 C
+0.05 C
1957
7.1 C
+1.15 C
1958
5.9 C
-0.12 C
1959
6.5 C
+0.47 C
1960
6.4 C
+0.40 C
1961
6.3 C
+0.36 C
1962
5.7 C
-0.29 C
1963
5.6 C
-0.38 C
1964
6.6 C
+0.65 C
1965
5.6 C
-0.43 C
1966
5.8 C
-0.17 C
1967
5.6 C
-0.43 C
1968
5.3 C
-0.69 C
1969
5.7 C
-0.26 C
1970
5.1 C
-0.87 C
1971
5.6 C
-0.36 C
1972
5.0 C
-0.98 C
1973
7.1 C
+1.07 C
1974
5.6 C
-0.34 C
1975
6.3 C
+0.33 C
1976
5.1 C
-0.90 C
1977
6.2 C
+0.20 C
1978
4.9 C
-1.13 C
1979
6.0 C
+0.06 C
1980
5.0 C
-0.97 C
1981
6.1 C
+0.13 C
1982
5.7 C
-0.32 C
1983
6.8 C
+0.77 C
The fitted trend in annual mean temperature here over 1915 to 1983 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 68 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Morrisburg
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.3) per decade
1915 to 1983
68
Not clearly different from zero
Mean daily maximum
-0.04 C (-0.16 to 0.07) per decade
-0.1 F (-0.3 to 0.1) per decade
1915 to 1983
68
Not clearly different from zero
Mean daily minimum
0.14 C (0.05 to 0.24) per decade
0.3 F (0.1 to 0.4) per decade
1915 to 1983
68
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
1913 to 1983
Yearly extremes at Morrisburg: 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)
1921
32.5 C (90.5 F)
71
Coldest night (TNn)
-40.0 C (-40.0 F)
1925
-33.9 C (-29.0 F)
71
Wettest day (Rx1day)
114.3 mm (4.5 in)
1915
45.2 mm (1.8 in)
71
Wettest five days (Rx5day)
152.6 mm (6.0 in)
1916
69.9 mm (2.8 in)
71
Longest dry spell (CDD)
28 days
1948
16 days
71
Hottest day (TXx)
The hottest day of the year at Morrisburg, 1913 to 1983. The record is 37.8 C (100.0 F) in 1921, marked on the chart; the median year is 32.5 C (90.5 F).
Hottest day (TXx) at Morrisburg by year
Year
Hottest day (TXx)
1913
35.6 C (96.1 F)
1914
32.2 C (90.0 F)
1915
31.1 C (88.0 F)
1916
33.9 C (93.0 F)
1917
34.4 C (93.9 F)
1918
32.8 C (91.0 F)
1919
35.0 C (95.0 F)
1920
32.2 C (90.0 F)
1921
37.8 C (100.0 F)
1922
31.7 C (89.1 F)
1923
31.7 C (89.1 F)
1924
30.6 C (87.1 F)
1925
31.7 C (89.1 F)
1926
30.6 C (87.1 F)
1927
31.7 C (89.1 F)
1928
32.2 C (90.0 F)
1929
31.7 C (89.1 F)
1930
30.6 C (87.1 F)
1931
36.1 C (97.0 F)
1932
32.8 C (91.0 F)
1933
35.0 C (95.0 F)
1934
33.9 C (93.0 F)
1935
33.3 C (91.9 F)
1936
33.9 C (93.0 F)
1937
33.3 C (91.9 F)
1938
34.4 C (93.9 F)
1939
33.9 C (93.0 F)
1940
32.2 C (90.0 F)
1941
35.0 C (95.0 F)
1942
33.9 C (93.0 F)
1943
32.2 C (90.0 F)
1944
37.2 C (99.0 F)
1945
31.1 C (88.0 F)
1946
34.4 C (93.9 F)
1947
32.8 C (91.0 F)
1948
34.4 C (93.9 F)
1949
36.7 C (98.1 F)
1950
31.7 C (89.1 F)
1951
30.6 C (87.1 F)
1952
31.1 C (88.0 F)
1953
34.4 C (93.9 F)
1954
30.0 C (86.0 F)
1955
36.7 C (98.1 F)
1956
30.6 C (87.1 F)
1957
31.7 C (89.1 F)
1958
30.6 C (87.1 F)
1959
33.3 C (91.9 F)
1960
31.7 C (89.1 F)
1961
29.4 C (84.9 F)
1962
32.2 C (90.0 F)
1963
32.8 C (91.0 F)
1964
33.9 C (93.0 F)
1965
31.7 C (89.1 F)
1966
33.3 C (91.9 F)
1967
30.6 C (87.1 F)
1968
32.8 C (91.0 F)
1969
31.7 C (89.1 F)
1970
31.7 C (89.1 F)
1971
31.1 C (88.0 F)
1972
30.6 C (87.1 F)
1973
32.8 C (91.0 F)
1974
31.1 C (88.0 F)
1975
35.0 C (95.0 F)
1976
31.1 C (88.0 F)
1977
32.2 C (90.0 F)
1978
32.5 C (90.5 F)
1979
32.5 C (90.5 F)
1980
31.0 C (87.8 F)
1981
33.0 C (91.4 F)
1982
33.0 C (91.4 F)
1983
33.0 C (91.4 F)
Coldest night (TNn)
The coldest night of the year at Morrisburg, 1913 to 1983. The record is -40.0 C (-40.0 F) in 1925, marked on the chart; the median year is -33.9 C (-29.0 F).
Coldest night (TNn) at Morrisburg by year
Year
Coldest night (TNn)
1913
-23.3 C (-9.9 F)
1914
-35.6 C (-32.1 F)
1915
-33.3 C (-27.9 F)
1916
-30.0 C (-22.0 F)
1917
-35.6 C (-32.1 F)
1918
-36.7 C (-34.1 F)
1919
-27.8 C (-18.0 F)
1920
-36.7 C (-34.1 F)
1921
-31.7 C (-25.1 F)
1922
-31.1 C (-24.0 F)
1923
-35.0 C (-31.0 F)
1924
-36.7 C (-34.1 F)
1925
-40.0 C (-40.0 F)
1926
-31.1 C (-24.0 F)
1927
-30.6 C (-23.1 F)
1928
-30.0 C (-22.0 F)
1929
-30.0 C (-22.0 F)
1930
-32.8 C (-27.0 F)
1931
-32.2 C (-26.0 F)
1932
-30.6 C (-23.1 F)
1933
-38.9 C (-38.0 F)
1934
-35.6 C (-32.1 F)
1935
-40.0 C (-40.0 F)
1936
-30.6 C (-23.1 F)
1937
-30.6 C (-23.1 F)
1938
-38.3 C (-36.9 F)
1939
-34.4 C (-29.9 F)
1940
-35.6 C (-32.1 F)
1941
-32.8 C (-27.0 F)
1942
-35.6 C (-32.1 F)
1943
-35.6 C (-32.1 F)
1944
-33.3 C (-27.9 F)
1945
-33.9 C (-29.0 F)
1946
-33.9 C (-29.0 F)
1947
-33.3 C (-27.9 F)
1948
-33.9 C (-29.0 F)
1949
-30.0 C (-22.0 F)
1950
-35.6 C (-32.1 F)
1951
-36.7 C (-34.1 F)
1952
-30.0 C (-22.0 F)
1953
-28.3 C (-18.9 F)
1954
-34.4 C (-29.9 F)
1955
-32.2 C (-26.0 F)
1956
-28.9 C (-20.0 F)
1957
-39.4 C (-38.9 F)
1958
-30.0 C (-22.0 F)
1959
-35.6 C (-32.1 F)
1960
-29.4 C (-20.9 F)
1961
-29.4 C (-20.9 F)
1962
-33.9 C (-29.0 F)
1963
-32.2 C (-26.0 F)
1964
-30.0 C (-22.0 F)
1965
-31.7 C (-25.1 F)
1966
-35.0 C (-31.0 F)
1967
-36.1 C (-33.0 F)
1968
-36.1 C (-33.0 F)
1969
-30.6 C (-23.1 F)
1970
-33.9 C (-29.0 F)
1971
-36.1 C (-33.0 F)
1972
-37.8 C (-36.0 F)
1973
-33.3 C (-27.9 F)
1974
-35.0 C (-31.0 F)
1975
-34.4 C (-29.9 F)
1976
-35.0 C (-31.0 F)
1977
-31.1 C (-24.0 F)
1978
-34.4 C (-29.9 F)
1979
-37.0 C (-34.6 F)
1980
-36.0 C (-32.8 F)
1981
-37.0 C (-34.6 F)
1982
-35.0 C (-31.0 F)
1983
-30.5 C (-22.9 F)
Wettest day (Rx1day)
The wettest day of the year at Morrisburg, 1913 to 1983. The record is 114.3 mm (4.5 in) in 1915, marked on the chart; the median year is 45.2 mm (1.8 in).
Wettest day (Rx1day) at Morrisburg by year
Year
Wettest day (Rx1day)
1913
33.0 mm (1.3 in)
1914
35.6 mm (1.4 in)
1915
114.3 mm (4.5 in)
1916
89.9 mm (3.5 in)
1917
31.8 mm (1.3 in)
1918
53.3 mm (2.1 in)
1919
69.9 mm (2.8 in)
1920
38.1 mm (1.5 in)
1921
31.8 mm (1.3 in)
1922
38.1 mm (1.5 in)
1923
90.2 mm (3.6 in)
1924
52.1 mm (2.1 in)
1925
35.6 mm (1.4 in)
1926
40.4 mm (1.6 in)
1927
40.4 mm (1.6 in)
1928
47.5 mm (1.9 in)
1929
36.1 mm (1.4 in)
1930
32.8 mm (1.3 in)
1931
27.9 mm (1.1 in)
1932
55.4 mm (2.2 in)
1933
59.9 mm (2.4 in)
1934
41.9 mm (1.6 in)
1935
42.4 mm (1.7 in)
1936
34.8 mm (1.4 in)
1937
41.4 mm (1.6 in)
1938
45.2 mm (1.8 in)
1939
35.6 mm (1.4 in)
1940
51.6 mm (2.0 in)
1941
34.0 mm (1.3 in)
1942
51.6 mm (2.0 in)
1943
55.4 mm (2.2 in)
1944
46.0 mm (1.8 in)
1945
56.6 mm (2.2 in)
1946
47.0 mm (1.9 in)
1947
60.7 mm (2.4 in)
1948
39.9 mm (1.6 in)
1949
29.2 mm (1.1 in)
1950
51.8 mm (2.0 in)
1951
53.6 mm (2.1 in)
1952
61.2 mm (2.4 in)
1953
59.2 mm (2.3 in)
1954
33.5 mm (1.3 in)
1955
58.7 mm (2.3 in)
1956
45.2 mm (1.8 in)
1957
26.4 mm (1.0 in)
1958
33.5 mm (1.3 in)
1959
47.0 mm (1.9 in)
1960
50.8 mm (2.0 in)
1961
38.1 mm (1.5 in)
1962
52.3 mm (2.1 in)
1963
52.8 mm (2.1 in)
1964
30.7 mm (1.2 in)
1965
34.3 mm (1.4 in)
1966
37.1 mm (1.5 in)
1967
35.1 mm (1.4 in)
1968
34.3 mm (1.4 in)
1969
67.8 mm (2.7 in)
1970
54.6 mm (2.1 in)
1971
63.5 mm (2.5 in)
1972
55.4 mm (2.2 in)
1973
33.0 mm (1.3 in)
1974
35.3 mm (1.4 in)
1975
52.3 mm (2.1 in)
1976
57.2 mm (2.3 in)
1977
45.2 mm (1.8 in)
1978
64.5 mm (2.5 in)
1979
107.2 mm (4.2 in)
1980
42.0 mm (1.7 in)
1981
80.4 mm (3.2 in)
1982
85.2 mm (3.4 in)
1983
35.6 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Morrisburg, 1913 to 1983. The record is 152.6 mm (6.0 in) in 1916, marked on the chart; the median year is 69.9 mm (2.8 in).
Wettest five days (Rx5day) at Morrisburg by year
Year
Wettest five days (Rx5day)
1913
79.3 mm (3.1 in)
1914
62.9 mm (2.5 in)
1915
117.6 mm (4.6 in)
1916
152.6 mm (6.0 in)
1917
48.3 mm (1.9 in)
1918
101.7 mm (4.0 in)
1919
73.7 mm (2.9 in)
1920
81.3 mm (3.2 in)
1921
66.1 mm (2.6 in)
1922
57.2 mm (2.3 in)
1923
139.5 mm (5.5 in)
1924
111.2 mm (4.4 in)
1925
69.9 mm (2.8 in)
1926
74.6 mm (2.9 in)
1927
87.1 mm (3.4 in)
1928
59.9 mm (2.4 in)
1929
65.3 mm (2.6 in)
1930
55.1 mm (2.2 in)
1931
45.7 mm (1.8 in)
1932
83.1 mm (3.3 in)
1933
66.0 mm (2.6 in)
1934
61.7 mm (2.4 in)
1935
70.6 mm (2.8 in)
1936
51.3 mm (2.0 in)
1937
61.7 mm (2.4 in)
1938
66.5 mm (2.6 in)
1939
94.3 mm (3.7 in)
1940
70.9 mm (2.8 in)
1941
68.1 mm (2.7 in)
1942
90.5 mm (3.6 in)
1943
92.8 mm (3.7 in)
1944
82.7 mm (3.3 in)
1945
82.3 mm (3.2 in)
1946
65.0 mm (2.6 in)
1947
86.4 mm (3.4 in)
1948
66.1 mm (2.6 in)
1949
59.4 mm (2.3 in)
1950
65.3 mm (2.6 in)
1951
81.3 mm (3.2 in)
1952
61.2 mm (2.4 in)
1953
64.5 mm (2.5 in)
1954
78.2 mm (3.1 in)
1955
83.4 mm (3.3 in)
1956
56.4 mm (2.2 in)
1957
40.7 mm (1.6 in)
1958
55.1 mm (2.2 in)
1959
50.0 mm (2.0 in)
1960
90.4 mm (3.6 in)
1961
56.4 mm (2.2 in)
1962
71.9 mm (2.8 in)
1963
63.0 mm (2.5 in)
1964
50.8 mm (2.0 in)
1965
56.1 mm (2.2 in)
1966
49.1 mm (1.9 in)
1967
52.1 mm (2.1 in)
1968
50.0 mm (2.0 in)
1969
113.9 mm (4.5 in)
1970
76.7 mm (3.0 in)
1971
89.2 mm (3.5 in)
1972
61.2 mm (2.4 in)
1973
70.4 mm (2.8 in)
1974
57.9 mm (2.3 in)
1975
74.2 mm (2.9 in)
1976
81.6 mm (3.2 in)
1977
104.4 mm (4.1 in)
1978
95.0 mm (3.7 in)
1979
150.8 mm (5.9 in)
1980
55.7 mm (2.2 in)
1981
91.2 mm (3.6 in)
1982
93.4 mm (3.7 in)
1983
68.6 mm (2.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Morrisburg, 1913 to 1983. The record is 28 days in 1948, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Morrisburg by year
Year
Longest dry spell (CDD)
1913
21 days
1914
17 days
1915
18 days
1916
18 days
1917
16 days
1918
15 days
1919
21 days
1920
12 days
1921
27 days
1922
15 days
1923
15 days
1924
16 days
1925
10 days
1926
11 days
1927
16 days
1928
15 days
1929
17 days
1930
19 days
1931
15 days
1932
16 days
1933
11 days
1934
15 days
1935
17 days
1936
11 days
1937
21 days
1938
14 days
1939
19 days
1940
11 days
1941
25 days
1942
15 days
1943
13 days
1944
17 days
1945
10 days
1946
10 days
1947
20 days
1948
28 days
1949
18 days
1950
14 days
1951
15 days
1952
21 days
1953
16 days
1954
11 days
1955
10 days
1956
19 days
1957
17 days
1958
13 days
1959
17 days
1960
18 days
1961
18 days
1962
17 days
1963
22 days
1964
22 days
1965
18 days
1966
11 days
1967
17 days
1968
16 days
1969
11 days
1970
18 days
1971
19 days
1972
13 days
1973
13 days
1974
12 days
1975
13 days
1976
12 days
1977
19 days
1978
12 days
1979
12 days
1980
11 days
1981
9 days
1982
14 days
1983
13 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
68 years with a frost
Across 68 years with a frost, the median last spring frost at Morrisburg falls on 17 May and the median first autumn frost on 19 September, which leaves a median of 126 days between them.
In 1954 to 1983 the median growing season was 129 days. That is 4 days more than in 1915 to 1944.
Fitted over all years, the growing season changes by +2.1 days per decade at this station.
Frost dates and growing season at Morrisburg
Measure
Median, all years
Earliest period (1915 to 1944)
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
17 May
16 May
17 May
1 day later
-0.8 days per decade
First autumn frost
19 September
19 September
21 September
2 days later
+1.3 days per decade
Growing days
126 days
125 days
129 days
4 days more
+2.1 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
70 years, 1914 to 1983
A day with at least 45.0 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 116.8 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Morrisburg: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.0 mm (1.8 in)
5 years
59.8 mm (2.4 in)
10 years
71.2 mm (2.8 in)
25 years
87.6 mm (3.4 in)
50 years
101.5 mm (4.0 in)
100 years
116.8 mm (4.6 in)
Longer than the 70 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, 70 years of values from 1914 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: 114.3 mm (4.5 in) in 1915; 107.2 mm (4.2 in) in 1979; 90.2 mm (3.6 in) in 1923.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Morrisburg, at 1954. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1954 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Morrisburg, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1954
-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 Morrisburg standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Morrisburg 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.