Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Donnacona. 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 Donnacona, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
10.0 C (50.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Feb
7.2 C (45.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Mar
17.8 C (64.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-18.9 C (-2.0 F)
n/a
n/a
May
31.1 C (88.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
36.7 C (98.1 F)
3.9 C (39.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
1.1 C (34.0 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-2.2 C (28.0 F)
n/a
n/a
Oct
25.6 C (78.1 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
18.9 C (66.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
10.6 C (51.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Donnacona still stand. 1936 holds the most, with 73.
Standing records at Donnacona by the year they were set
Year set
Standing records
1918
27
1919
60
1920
57
1921
69
1922
63
1923
72
1924
30
1925
47
1926
26
1927
48
1928
44
1929
44
1930
38
1931
58
1932
53
1933
70
1934
46
1935
35
1936
73
1937
63
1938
60
1939
50
1940
48
1941
38
1942
43
1943
26
1944
33
1945
29
1946
38
1962
13
1963
33
1964
30
Wettest Day of Each Month
Aug: 121.9 mm (4.8 in)
The wettest day on record for each calendar month at Donnacona. The most was 121.9 mm (4.8 in) on 21 August 1935.
Record daily precipitation for each month at Donnacona
Month
Record daily precipitation (mm)
Date
Jan
47.0 mm (1.9 in)
11 January 1922
Feb
50.8 mm (2.0 in)
21 February 1924
Mar
45.7 mm (1.8 in)
8 March 1956
Apr
55.1 mm (2.2 in)
12 April 1920
May
56.6 mm (2.2 in)
17 May 1945
Jun
68.6 mm (2.7 in)
2 June 1954
Jul
87.4 mm (3.4 in)
10 July 1945
Aug
121.9 mm (4.8 in)
21 August 1935
Sep
81.8 mm (3.2 in)
1 September 1945
Oct
93.5 mm (3.7 in)
24 October 1923
Nov
58.4 mm (2.3 in)
6 November 1948
Dec
57.9 mm (2.3 in)
15 December 1918
Period of Record Coverage
1918 to 1964
Complete yearUnder 90 percent of days
32 years of record at Donnacona, 1918 to 1964. 10 years have data for under 90 percent of days and are left out of rankings: 1918, 1933, 1934, 1943, 1944, 1945, 1946, 1962 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Donnacona, 1919 to 1942. Blue stripes are years cooler than the station's own mean of 4.7 C (40.5 F); red stripes are warmer. The coolest year was 1940, at 3.6 C (38.4 F), and the warmest was 1931, at 6.5 C (43.7 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Donnacona as warming stripes, 1919 to 1942
Year
Annual mean temperature
Difference from the station mean
1919
4.3 C
-0.41 C
1920
4.6 C
-0.10 C
1921
5.6 C
+0.88 C
1922
4.7 C
+0.02 C
1923
4.0 C
-0.72 C
1924
4.6 C
-0.13 C
1925
4.2 C
-0.52 C
1926
3.6 C
-1.13 C
1927
5.5 C
+0.76 C
1928
4.5 C
-0.21 C
1929
4.0 C
-0.72 C
1930
5.2 C
+0.47 C
1931
6.5 C
+1.77 C
1932
4.9 C
+0.21 C
1936
4.2 C
-0.53 C
1937
6.1 C
+1.42 C
1938
5.3 C
+0.58 C
1939
4.4 C
-0.35 C
1940
3.6 C
-1.14 C
1941
4.6 C
-0.07 C
1942
4.6 C
-0.15 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1918 to 1964
Yearly extremes at Donnacona: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1921
32.2 C (90.0 F)
32
Coldest night (TNn)
-38.9 C (-38.0 F)
1934
-31.7 C (-25.1 F)
32
Wettest day (Rx1day)
121.9 mm (4.8 in)
1935
50.3 mm (2.0 in)
47
Wettest five days (Rx5day)
185.4 mm (7.3 in)
1949
75.7 mm (3.0 in)
47
Longest dry spell (CDD)
24 days
1956
14 days
47
Hottest day (TXx)
The hottest day of the year at Donnacona, 1918 to 1964. The record is 36.7 C (98.1 F) in 1921, marked on the chart; the median year is 32.2 C (90.0 F).
Hottest day (TXx) at Donnacona by year
Year
Hottest day (TXx)
1918
33.3 C (91.9 F)
1919
35.6 C (96.1 F)
1920
31.7 C (89.1 F)
1921
36.7 C (98.1 F)
1922
31.7 C (89.1 F)
1923
31.7 C (89.1 F)
1924
31.1 C (88.0 F)
1925
32.8 C (91.0 F)
1926
32.2 C (90.0 F)
1927
31.7 C (89.1 F)
1928
36.7 C (98.1 F)
1929
32.2 C (90.0 F)
1930
32.2 C (90.0 F)
1931
33.3 C (91.9 F)
1932
31.1 C (88.0 F)
1933
31.1 C (88.0 F)
1934
30.0 C (86.0 F)
1935
36.7 C (98.1 F)
1936
31.1 C (88.0 F)
1937
33.3 C (91.9 F)
1938
34.4 C (93.9 F)
1939
33.3 C (91.9 F)
1940
31.1 C (88.0 F)
1941
32.2 C (90.0 F)
1942
32.2 C (90.0 F)
1943
31.7 C (89.1 F)
1944
33.3 C (91.9 F)
1945
33.3 C (91.9 F)
1946
31.7 C (89.1 F)
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
31.1 C (88.0 F)
1963
34.4 C (93.9 F)
1964
31.7 C (89.1 F)
Coldest night (TNn)
The coldest night of the year at Donnacona, 1918 to 1964. The record is -38.9 C (-38.0 F) in 1934, marked on the chart; the median year is -31.7 C (-25.1 F).
Coldest night (TNn) at Donnacona by year
Year
Coldest night (TNn)
1918
-21.7 C (-7.1 F)
1919
-34.4 C (-29.9 F)
1920
-36.1 C (-33.0 F)
1921
-28.3 C (-18.9 F)
1922
-31.1 C (-24.0 F)
1923
-32.8 C (-27.0 F)
1924
-33.3 C (-27.9 F)
1925
-34.4 C (-29.9 F)
1926
-27.2 C (-17.0 F)
1927
-28.3 C (-18.9 F)
1928
-31.1 C (-24.0 F)
1929
-33.9 C (-29.0 F)
1930
-34.4 C (-29.9 F)
1931
-28.9 C (-20.0 F)
1932
-29.4 C (-20.9 F)
1933
-36.7 C (-34.1 F)
1934
-38.9 C (-38.0 F)
1935
-35.0 C (-31.0 F)
1936
-31.1 C (-24.0 F)
1937
-27.2 C (-17.0 F)
1938
-34.4 C (-29.9 F)
1939
-33.3 C (-27.9 F)
1940
-29.4 C (-20.9 F)
1941
-30.0 C (-22.0 F)
1942
-31.7 C (-25.1 F)
1943
-31.7 C (-25.1 F)
1944
-31.7 C (-25.1 F)
1945
-36.1 C (-33.0 F)
1946
-27.2 C (-17.0 F)
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
-20.6 C (-5.1 F)
1963
-30.0 C (-22.0 F)
1964
-31.7 C (-25.1 F)
Wettest day (Rx1day)
The wettest day of the year at Donnacona, 1918 to 1964. The record is 121.9 mm (4.8 in) in 1935, marked on the chart; the median year is 50.3 mm (2.0 in).
Wettest day (Rx1day) at Donnacona by year
Year
Wettest day (Rx1day)
1918
71.9 mm (2.8 in)
1919
47.2 mm (1.9 in)
1920
75.2 mm (3.0 in)
1921
30.5 mm (1.2 in)
1922
64.8 mm (2.6 in)
1923
93.5 mm (3.7 in)
1924
50.8 mm (2.0 in)
1925
42.2 mm (1.7 in)
1926
32.5 mm (1.3 in)
1927
53.3 mm (2.1 in)
1928
38.1 mm (1.5 in)
1929
35.6 mm (1.4 in)
1930
36.1 mm (1.4 in)
1931
39.9 mm (1.6 in)
1932
67.1 mm (2.6 in)
1933
65.3 mm (2.6 in)
1934
30.5 mm (1.2 in)
1935
121.9 mm (4.8 in)
1936
36.3 mm (1.4 in)
1937
54.6 mm (2.1 in)
1938
91.7 mm (3.6 in)
1939
32.3 mm (1.3 in)
1940
62.5 mm (2.5 in)
1941
31.0 mm (1.2 in)
1942
50.8 mm (2.0 in)
1943
57.7 mm (2.3 in)
1944
48.0 mm (1.9 in)
1945
87.4 mm (3.4 in)
1946
52.1 mm (2.1 in)
1947
45.7 mm (1.8 in)
1948
58.4 mm (2.3 in)
1949
102.6 mm (4.0 in)
1950
54.4 mm (2.1 in)
1951
87.4 mm (3.4 in)
1952
41.7 mm (1.6 in)
1953
25.4 mm (1.0 in)
1954
68.6 mm (2.7 in)
1955
50.3 mm (2.0 in)
1956
45.7 mm (1.8 in)
1957
49.3 mm (1.9 in)
1958
45.7 mm (1.8 in)
1959
48.3 mm (1.9 in)
1960
58.4 mm (2.3 in)
1961
39.6 mm (1.6 in)
1962
33.0 mm (1.3 in)
1963
60.7 mm (2.4 in)
1964
31.8 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Donnacona, 1918 to 1964. The record is 185.4 mm (7.3 in) in 1949, marked on the chart; the median year is 75.7 mm (3.0 in).
Wettest five days (Rx5day) at Donnacona by year
Year
Wettest five days (Rx5day)
1918
111.3 mm (4.4 in)
1919
65.2 mm (2.6 in)
1920
106.9 mm (4.2 in)
1921
53.5 mm (2.1 in)
1922
116.1 mm (4.6 in)
1923
98.1 mm (3.9 in)
1924
92.2 mm (3.6 in)
1925
63.3 mm (2.5 in)
1926
61.0 mm (2.4 in)
1927
71.1 mm (2.8 in)
1928
94.5 mm (3.7 in)
1929
50.5 mm (2.0 in)
1930
74.7 mm (2.9 in)
1931
94.1 mm (3.7 in)
1932
86.1 mm (3.4 in)
1933
113.3 mm (4.5 in)
1934
74.7 mm (2.9 in)
1935
121.9 mm (4.8 in)
1936
62.5 mm (2.5 in)
1937
116.9 mm (4.6 in)
1938
115.6 mm (4.6 in)
1939
63.5 mm (2.5 in)
1940
64.8 mm (2.6 in)
1941
43.0 mm (1.7 in)
1942
71.6 mm (2.8 in)
1943
181.4 mm (7.1 in)
1944
69.6 mm (2.7 in)
1945
129.7 mm (5.1 in)
1946
52.6 mm (2.1 in)
1947
79.4 mm (3.1 in)
1948
76.5 mm (3.0 in)
1949
185.4 mm (7.3 in)
1950
146.8 mm (5.8 in)
1951
105.6 mm (4.2 in)
1952
70.7 mm (2.8 in)
1953
43.9 mm (1.7 in)
1954
175.3 mm (6.9 in)
1955
68.3 mm (2.7 in)
1956
68.4 mm (2.7 in)
1957
82.7 mm (3.3 in)
1958
75.7 mm (3.0 in)
1959
95.8 mm (3.8 in)
1960
81.3 mm (3.2 in)
1961
53.6 mm (2.1 in)
1962
67.9 mm (2.7 in)
1963
66.0 mm (2.6 in)
1964
50.6 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Donnacona, 1918 to 1964. The record is 24 days in 1956, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Donnacona by year
Year
Longest dry spell (CDD)
1918
8 days
1919
11 days
1920
10 days
1921
16 days
1922
23 days
1923
9 days
1924
13 days
1925
18 days
1926
14 days
1927
21 days
1928
12 days
1929
13 days
1930
8 days
1931
12 days
1932
16 days
1933
14 days
1934
8 days
1935
13 days
1936
8 days
1937
17 days
1938
14 days
1939
22 days
1940
12 days
1941
17 days
1942
13 days
1943
11 days
1944
16 days
1945
15 days
1946
14 days
1947
20 days
1948
10 days
1949
16 days
1950
17 days
1951
15 days
1952
18 days
1953
18 days
1954
14 days
1955
17 days
1956
24 days
1957
16 days
1958
21 days
1959
12 days
1960
15 days
1961
11 days
1962
17 days
1963
12 days
1964
5 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Donnacona falls on 13 May and the median first autumn frost on 29 September, which leaves a median of 139 days between them.
Frost dates and growing season at Donnacona
Measure
Median, all years
Earliest period
Recent period (1919 to 1942)
Recent against earliest
Fitted trend
Last spring frost
13 May
n/a
13 May
n/a
n/a
First autumn frost
29 September
n/a
29 September
n/a
n/a
Growing days
139 days
n/a
139 days
n/a
n/a
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
37 years, 1919 to 1960
A day with at least 49.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 139.5 mm (5.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Donnacona: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
49.8 mm (2.0 in)
5 years
68.4 mm (2.7 in)
10 years
82.6 mm (3.3 in)
25 years
103.1 mm (4.1 in)
50 years
120.4 mm (4.7 in)
Longer than the 37 years of record
100 years
139.5 mm (5.5 in)
Longer than the 37 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, 37 years of values from 1919 to 1960.
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: 121.9 mm (4.8 in) in 1935; 102.6 mm (4.0 in) in 1949; 93.5 mm (3.7 in) in 1923.
Download the Data
Data for Donnacona standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Donnacona 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.