Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Fort Frances. 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 Fort Frances, 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)
-44.4 C (-47.9 F)
n/a
n/a
Feb
12.2 C (54.0 F)
-43.3 C (-45.9 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-25.6 C (-14.1 F)
n/a
n/a
May
34.4 C (93.9 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
35.6 C (96.1 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-16.7 C (1.9 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Dec
13.9 C (57.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Fort Frances still stand. 1893 holds the most, with 48.
Standing records at Fort Frances by the year they were set
Year set
Standing records
1892
26
1893
48
1894
13
1895
14
1896
36
1912
2
1913
34
1914
26
1915
1
1916
3
1917
25
1918
27
1919
21
1920
14
1921
17
1922
22
1923
34
1924
28
1925
36
1926
24
1927
19
1928
29
1929
27
1930
35
1931
35
1932
15
1933
24
1934
22
1935
19
1936
41
1937
19
1938
15
1939
13
1940
13
1941
13
1942
14
1943
3
1944
11
1945
28
1946
18
1947
21
1948
16
1949
3
1950
11
1951
14
1952
23
1953
24
1954
19
1955
14
1956
26
1957
8
1958
26
1959
17
1960
8
1961
11
1962
18
1963
27
1964
21
1965
13
1966
21
1967
17
1968
17
1969
13
1970
11
1971
12
1972
20
1973
6
1974
13
1975
17
1976
23
1977
25
1978
7
1979
8
1980
14
1981
13
1982
16
1983
27
All-Time Record Progression
4 new records
4 all-time records were set at Fort Frances between 6 June 1941 and 14 January 1972. Each dot is a new record.
When Fort Frances set new all-time records
Date
Kind
Detail
1941-06-06
Record daily precipitation
Record daily precipitation 83.8 mm (3.3 in)
1966-07-02
Record daily precipitation
Record daily precipitation 90.9 mm (3.6 in)
1966-07-30
Record daily precipitation
Record daily precipitation 113.8 mm (4.5 in)
1972-01-14
Record low maximum temperature
Record low maximum temperature -33.3 C (-27.9 F)
Wettest Day of Each Month
Jul: 113.8 mm (4.5 in)
The wettest day on record for each calendar month at Fort Frances. The most was 113.8 mm (4.5 in) on 30 July 1966.
Record daily precipitation for each month at Fort Frances
Month
Record daily precipitation (mm)
Date
Jan
38.1 mm (1.5 in)
14 January 1947
Feb
53.3 mm (2.1 in)
8 February 1892
Mar
50.8 mm (2.0 in)
11 March 1947
Apr
49.5 mm (1.9 in)
23 April 1937
May
56.1 mm (2.2 in)
28 May 1972
Jun
83.8 mm (3.3 in)
6 June 1941
Jul
113.8 mm (4.5 in)
30 July 1966
Aug
80.5 mm (3.2 in)
5 August 1973
Sep
68.1 mm (2.7 in)
17 September 1955
Oct
64.8 mm (2.6 in)
19 October 1934
Nov
40.4 mm (1.6 in)
8 November 1977
Dec
43.2 mm (1.7 in)
7 December 1916
Period of Record Coverage
1892 to 1983
Complete yearUnder 90 percent of days
77 years of record at Fort Frances, 1892 to 1983. 7 years have data for under 90 percent of days and are left out of rankings: 1894, 1895, 1896, 1912, 1914, 1915, 1916.
Cooler than the station meanWarmer than the station mean
One stripe for each of 66 complete years at Fort Frances, 1893 to 1983. Blue stripes are years cooler than the station's own mean of 3.0 C (37.4 F); red stripes are warmer. The coolest year was 1893, at -0.2 C (31.6 F), and the warmest was 1931, at 6.5 C (43.8 F). The strongest colour marks a difference of 3.6 C (6.5 F).
Annual mean temperature at Fort Frances as warming stripes, 1893 to 1983
Year
Annual mean temperature
Difference from the station mean
1893
-0.2 C
-3.20 C
1913
4.7 C
+1.75 C
1917
1.4 C
-1.58 C
1918
4.2 C
+1.23 C
1919
4.2 C
+1.16 C
1920
3.2 C
+0.21 C
1921
4.0 C
+0.99 C
1922
2.7 C
-0.31 C
1923
2.2 C
-0.79 C
1924
0.7 C
-2.25 C
1925
1.9 C
-1.05 C
1926
1.8 C
-1.24 C
1927
2.1 C
-0.93 C
1928
3.7 C
+0.66 C
1929
2.7 C
-0.34 C
1930
4.6 C
+1.60 C
1931
6.5 C
+3.55 C
1932
3.1 C
+0.10 C
1933
2.2 C
-0.82 C
1934
2.5 C
-0.51 C
1935
2.6 C
-0.42 C
1936
2.5 C
-0.46 C
1937
3.5 C
+0.54 C
1938
4.2 C
+1.24 C
1940
4.3 C
+1.26 C
1941
4.9 C
+1.93 C
1942
3.6 C
+0.63 C
1943
2.6 C
-0.41 C
1945
2.5 C
-0.47 C
1946
3.0 C
+0.02 C
1947
2.4 C
-0.63 C
1948
2.7 C
-0.34 C
1949
2.6 C
-0.40 C
1950
1.2 C
-1.76 C
1952
4.4 C
+1.39 C
1953
4.1 C
+1.14 C
1954
2.9 C
-0.11 C
1955
2.7 C
-0.34 C
1956
2.6 C
-0.36 C
1957
2.7 C
-0.30 C
1958
3.0 C
+0.05 C
1959
2.6 C
-0.36 C
1960
3.0 C
-0.02 C
1961
3.8 C
+0.80 C
1962
2.9 C
-0.13 C
1963
3.7 C
+0.70 C
1964
3.1 C
+0.06 C
1965
2.1 C
-0.94 C
1966
2.1 C
-0.93 C
1967
2.0 C
-1.00 C
1968
2.9 C
-0.10 C
1969
2.9 C
-0.06 C
1970
2.4 C
-0.62 C
1971
2.9 C
-0.11 C
1972
1.9 C
-1.12 C
1973
4.3 C
+1.28 C
1974
3.0 C
-0.02 C
1975
3.5 C
+0.48 C
1976
3.1 C
+0.07 C
1977
3.8 C
+0.85 C
1978
2.5 C
-0.45 C
1979
2.0 C
-0.99 C
1980
3.2 C
+0.24 C
1981
4.5 C
+1.54 C
1982
2.3 C
-0.67 C
1983
4.2 C
+1.17 C
The fitted trend in annual mean temperature here over 1893 to 1983 is 0.04 C (-0.08 to 0.17) 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 66 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Fort Frances
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.08 to 0.17) per decade
0.1 F (-0.1 to 0.3) per decade
1893 to 1983
66
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.4) per decade
1893 to 1983
66
Not clearly different from zero
Mean daily minimum
0.02 C (-0.12 to 0.16) per decade
0.04 F (-0.21 to 0.29) per decade
1893 to 1983
66
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
1892 to 1983
Yearly extremes at Fort Frances: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1936
33.3 C (91.9 F)
77
Coldest night (TNn)
-44.4 C (-47.9 F)
1896
-36.7 C (-34.1 F)
77
Wettest day (Rx1day)
113.8 mm (4.5 in)
1966
44.0 mm (1.7 in)
78
Wettest five days (Rx5day)
154.5 mm (6.1 in)
1942
70.4 mm (2.8 in)
78
Longest dry spell (CDD)
54 days
1894
20 days
78
Hottest day (TXx)
The hottest day of the year at Fort Frances, 1892 to 1983. The record is 42.2 C (108.0 F) in 1936, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Fort Frances by year
Year
Hottest day (TXx)
1892
33.3 C (91.9 F)
1893
33.9 C (93.0 F)
1894
23.9 C (75.0 F)
1895
32.2 C (90.0 F)
1896
37.2 C (99.0 F)
1911
n/a
1912
11.1 C (52.0 F)
1913
38.9 C (102.0 F)
1914
36.7 C (98.1 F)
1915
6.7 C (44.1 F)
1916
14.4 C (57.9 F)
1917
36.7 C (98.1 F)
1918
34.4 C (93.9 F)
1919
33.3 C (91.9 F)
1920
31.1 C (88.0 F)
1921
35.6 C (96.1 F)
1922
31.1 C (88.0 F)
1923
31.1 C (88.0 F)
1924
31.1 C (88.0 F)
1925
32.2 C (90.0 F)
1926
32.2 C (90.0 F)
1927
31.1 C (88.0 F)
1928
31.1 C (88.0 F)
1929
37.8 C (100.0 F)
1930
35.6 C (96.1 F)
1931
40.0 C (104.0 F)
1932
32.2 C (90.0 F)
1933
36.7 C (98.1 F)
1934
33.3 C (91.9 F)
1935
32.2 C (90.0 F)
1936
42.2 C (108.0 F)
1937
35.6 C (96.1 F)
1938
30.0 C (86.0 F)
1939
34.4 C (93.9 F)
1940
36.1 C (97.0 F)
1941
33.3 C (91.9 F)
1942
31.1 C (88.0 F)
1943
32.2 C (90.0 F)
1944
30.0 C (86.0 F)
1945
34.4 C (93.9 F)
1946
32.8 C (91.0 F)
1947
33.3 C (91.9 F)
1948
33.3 C (91.9 F)
1949
34.4 C (93.9 F)
1950
32.8 C (91.0 F)
1951
32.2 C (90.0 F)
1952
33.3 C (91.9 F)
1953
33.3 C (91.9 F)
1954
32.2 C (90.0 F)
1955
33.9 C (93.0 F)
1956
34.4 C (93.9 F)
1957
31.7 C (89.1 F)
1958
32.2 C (90.0 F)
1959
33.9 C (93.0 F)
1960
31.1 C (88.0 F)
1961
34.4 C (93.9 F)
1962
30.0 C (86.0 F)
1963
31.1 C (88.0 F)
1964
34.4 C (93.9 F)
1965
31.7 C (89.1 F)
1966
34.4 C (93.9 F)
1967
32.8 C (91.0 F)
1968
30.0 C (86.0 F)
1969
34.4 C (93.9 F)
1970
33.3 C (91.9 F)
1971
32.2 C (90.0 F)
1972
32.2 C (90.0 F)
1973
32.2 C (90.0 F)
1974
34.4 C (93.9 F)
1975
36.1 C (97.0 F)
1976
34.4 C (93.9 F)
1977
33.9 C (93.0 F)
1978
32.5 C (90.5 F)
1979
32.0 C (89.6 F)
1980
33.0 C (91.4 F)
1981
35.5 C (95.9 F)
1982
33.0 C (91.4 F)
1983
35.5 C (95.9 F)
Coldest night (TNn)
The coldest night of the year at Fort Frances, 1892 to 1983. The record is -44.4 C (-47.9 F) in 1896, marked on the chart; the median year is -36.7 C (-34.1 F).
Coldest night (TNn) at Fort Frances by year
Year
Coldest night (TNn)
1892
-41.7 C (-43.1 F)
1893
-43.3 C (-45.9 F)
1894
-43.3 C (-45.9 F)
1895
-28.9 C (-20.0 F)
1896
-44.4 C (-47.9 F)
1911
n/a
1912
-32.2 C (-26.0 F)
1913
-35.6 C (-32.1 F)
1914
-31.7 C (-25.1 F)
1915
-37.8 C (-36.0 F)
1916
-36.1 C (-33.0 F)
1917
-37.8 C (-36.0 F)
1918
-36.1 C (-33.0 F)
1919
-33.3 C (-27.9 F)
1920
-34.4 C (-29.9 F)
1921
-34.4 C (-29.9 F)
1922
-38.9 C (-38.0 F)
1923
-38.9 C (-38.0 F)
1924
-36.7 C (-34.1 F)
1925
-34.4 C (-29.9 F)
1926
-35.6 C (-32.1 F)
1927
-35.6 C (-32.1 F)
1928
-33.3 C (-27.9 F)
1929
-35.6 C (-32.1 F)
1930
-35.6 C (-32.1 F)
1931
-26.7 C (-16.1 F)
1932
-34.4 C (-29.9 F)
1933
-41.1 C (-42.0 F)
1934
-38.9 C (-38.0 F)
1935
-41.1 C (-42.0 F)
1936
-38.9 C (-38.0 F)
1937
-36.7 C (-34.1 F)
1938
-34.4 C (-29.9 F)
1939
-34.4 C (-29.9 F)
1940
-33.3 C (-27.9 F)
1941
-31.7 C (-25.1 F)
1942
-33.9 C (-29.0 F)
1943
-37.8 C (-36.0 F)
1944
-29.4 C (-20.9 F)
1945
-33.9 C (-29.0 F)
1946
-36.7 C (-34.1 F)
1947
-35.6 C (-32.1 F)
1948
-38.9 C (-38.0 F)
1949
-37.8 C (-36.0 F)
1950
-41.1 C (-42.0 F)
1951
-37.2 C (-35.0 F)
1952
-33.9 C (-29.0 F)
1953
-34.4 C (-29.9 F)
1954
-40.0 C (-40.0 F)
1955
-39.4 C (-38.9 F)
1956
-33.9 C (-29.0 F)
1957
-38.3 C (-36.9 F)
1958
-37.8 C (-36.0 F)
1959
-36.7 C (-34.1 F)
1960
-31.7 C (-25.1 F)
1961
-37.2 C (-35.0 F)
1962
-38.9 C (-38.0 F)
1963
-37.8 C (-36.0 F)
1964
-35.6 C (-32.1 F)
1965
-40.6 C (-41.1 F)
1966
-43.3 C (-45.9 F)
1967
-40.6 C (-41.1 F)
1968
-41.1 C (-42.0 F)
1969
-37.2 C (-35.0 F)
1970
-38.3 C (-36.9 F)
1971
-35.6 C (-32.1 F)
1972
-41.1 C (-42.0 F)
1973
-38.9 C (-38.0 F)
1974
-36.1 C (-33.0 F)
1975
-33.9 C (-29.0 F)
1976
-36.7 C (-34.1 F)
1977
-37.2 C (-35.0 F)
1978
-40.0 C (-40.0 F)
1979
-38.0 C (-36.4 F)
1980
-33.5 C (-28.3 F)
1981
-38.0 C (-36.4 F)
1982
-37.5 C (-35.5 F)
1983
-37.0 C (-34.6 F)
Wettest day (Rx1day)
The wettest day of the year at Fort Frances, 1892 to 1983. The record is 113.8 mm (4.5 in) in 1966, marked on the chart; the median year is 44.0 mm (1.7 in).
Wettest day (Rx1day) at Fort Frances by year
Year
Wettest day (Rx1day)
1892
63.5 mm (2.5 in)
1893
57.7 mm (2.3 in)
1894
40.1 mm (1.6 in)
1895
30.0 mm (1.2 in)
1896
31.2 mm (1.2 in)
1911
10.7 mm (0.4 in)
1912
25.4 mm (1.0 in)
1913
43.2 mm (1.7 in)
1914
30.0 mm (1.2 in)
1915
13.0 mm (0.5 in)
1916
43.2 mm (1.7 in)
1917
44.2 mm (1.7 in)
1918
32.3 mm (1.3 in)
1919
73.4 mm (2.9 in)
1920
71.1 mm (2.8 in)
1921
36.8 mm (1.4 in)
1922
44.5 mm (1.8 in)
1923
36.6 mm (1.4 in)
1924
33.8 mm (1.3 in)
1925
52.3 mm (2.1 in)
1926
43.7 mm (1.7 in)
1927
31.5 mm (1.2 in)
1928
53.3 mm (2.1 in)
1929
28.7 mm (1.1 in)
1930
31.2 mm (1.2 in)
1931
43.2 mm (1.7 in)
1932
34.3 mm (1.4 in)
1933
58.4 mm (2.3 in)
1934
64.8 mm (2.6 in)
1935
80.0 mm (3.1 in)
1936
64.8 mm (2.6 in)
1937
63.5 mm (2.5 in)
1938
30.5 mm (1.2 in)
1939
30.5 mm (1.2 in)
1940
48.8 mm (1.9 in)
1941
83.8 mm (3.3 in)
1942
77.5 mm (3.1 in)
1943
35.6 mm (1.4 in)
1944
76.2 mm (3.0 in)
1945
40.6 mm (1.6 in)
1946
61.0 mm (2.4 in)
1947
50.8 mm (2.0 in)
1948
68.3 mm (2.7 in)
1949
48.3 mm (1.9 in)
1950
40.1 mm (1.6 in)
1951
66.8 mm (2.6 in)
1952
40.4 mm (1.6 in)
1953
48.5 mm (1.9 in)
1954
23.4 mm (0.9 in)
1955
68.1 mm (2.7 in)
1956
35.1 mm (1.4 in)
1957
67.8 mm (2.7 in)
1958
22.6 mm (0.9 in)
1959
54.4 mm (2.1 in)
1960
38.1 mm (1.5 in)
1961
54.9 mm (2.2 in)
1962
44.7 mm (1.8 in)
1963
46.7 mm (1.8 in)
1964
69.3 mm (2.7 in)
1965
57.9 mm (2.3 in)
1966
113.8 mm (4.5 in)
1967
36.6 mm (1.4 in)
1968
43.7 mm (1.7 in)
1969
61.5 mm (2.4 in)
1970
38.6 mm (1.5 in)
1971
55.4 mm (2.2 in)
1972
97.3 mm (3.8 in)
1973
80.5 mm (3.2 in)
1974
56.4 mm (2.2 in)
1975
26.7 mm (1.1 in)
1976
40.4 mm (1.6 in)
1977
42.7 mm (1.7 in)
1978
56.4 mm (2.2 in)
1979
53.0 mm (2.1 in)
1980
29.6 mm (1.2 in)
1981
40.4 mm (1.6 in)
1982
38.8 mm (1.5 in)
1983
40.2 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Fort Frances, 1892 to 1983. The record is 154.5 mm (6.1 in) in 1942, marked on the chart; the median year is 70.4 mm (2.8 in).
Wettest five days (Rx5day) at Fort Frances by year
Year
Wettest five days (Rx5day)
1892
92.7 mm (3.6 in)
1893
60.5 mm (2.4 in)
1894
57.7 mm (2.3 in)
1895
55.2 mm (2.2 in)
1896
73.7 mm (2.9 in)
1911
10.7 mm (0.4 in)
1912
54.8 mm (2.2 in)
1913
60.5 mm (2.4 in)
1914
68.1 mm (2.7 in)
1915
18.6 mm (0.7 in)
1916
43.2 mm (1.7 in)
1917
58.1 mm (2.3 in)
1918
41.9 mm (1.6 in)
1919
148.6 mm (5.9 in)
1920
74.1 mm (2.9 in)
1921
48.5 mm (1.9 in)
1922
50.0 mm (2.0 in)
1923
59.9 mm (2.4 in)
1924
38.9 mm (1.5 in)
1925
78.7 mm (3.1 in)
1926
90.4 mm (3.6 in)
1927
60.4 mm (2.4 in)
1928
62.8 mm (2.5 in)
1929
34.2 mm (1.3 in)
1930
60.3 mm (2.4 in)
1931
53.4 mm (2.1 in)
1932
62.9 mm (2.5 in)
1933
80.3 mm (3.2 in)
1934
110.0 mm (4.3 in)
1935
104.3 mm (4.1 in)
1936
104.2 mm (4.1 in)
1937
115.6 mm (4.6 in)
1938
74.7 mm (2.9 in)
1939
53.2 mm (2.1 in)
1940
62.7 mm (2.5 in)
1941
94.0 mm (3.7 in)
1942
154.5 mm (6.1 in)
1943
53.4 mm (2.1 in)
1944
101.6 mm (4.0 in)
1945
68.8 mm (2.7 in)
1946
95.7 mm (3.8 in)
1947
114.3 mm (4.5 in)
1948
129.5 mm (5.1 in)
1949
70.2 mm (2.8 in)
1950
95.5 mm (3.8 in)
1951
75.9 mm (3.0 in)
1952
88.4 mm (3.5 in)
1953
58.6 mm (2.3 in)
1954
41.1 mm (1.6 in)
1955
97.5 mm (3.8 in)
1956
47.5 mm (1.9 in)
1957
87.3 mm (3.4 in)
1958
68.8 mm (2.7 in)
1959
81.1 mm (3.2 in)
1960
51.3 mm (2.0 in)
1961
96.6 mm (3.8 in)
1962
92.3 mm (3.6 in)
1963
64.5 mm (2.5 in)
1964
96.4 mm (3.8 in)
1965
70.5 mm (2.8 in)
1966
115.6 mm (4.6 in)
1967
86.1 mm (3.4 in)
1968
81.8 mm (3.2 in)
1969
68.5 mm (2.7 in)
1970
56.1 mm (2.2 in)
1971
84.6 mm (3.3 in)
1972
102.9 mm (4.1 in)
1973
94.7 mm (3.7 in)
1974
98.3 mm (3.9 in)
1975
49.7 mm (2.0 in)
1976
90.7 mm (3.6 in)
1977
59.7 mm (2.4 in)
1978
85.2 mm (3.4 in)
1979
97.6 mm (3.8 in)
1980
46.7 mm (1.8 in)
1981
66.8 mm (2.6 in)
1982
64.0 mm (2.5 in)
1983
77.8 mm (3.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Fort Frances, 1892 to 1983. The record is 54 days in 1894, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Fort Frances by year
Year
Longest dry spell (CDD)
1892
22 days
1893
14 days
1894
54 days
1895
16 days
1896
18 days
1911
12 days
1912
27 days
1913
27 days
1914
18 days
1915
16 days
1916
22 days
1917
42 days
1918
17 days
1919
17 days
1920
33 days
1921
24 days
1922
17 days
1923
21 days
1924
27 days
1925
28 days
1926
36 days
1927
20 days
1928
30 days
1929
20 days
1930
25 days
1931
26 days
1932
23 days
1933
18 days
1934
16 days
1935
14 days
1936
21 days
1937
16 days
1938
40 days
1939
25 days
1940
27 days
1941
17 days
1942
23 days
1943
26 days
1944
24 days
1945
15 days
1946
15 days
1947
12 days
1948
20 days
1949
20 days
1950
17 days
1951
14 days
1952
28 days
1953
25 days
1954
12 days
1955
21 days
1956
23 days
1957
14 days
1958
40 days
1959
21 days
1960
32 days
1961
32 days
1962
19 days
1963
23 days
1964
18 days
1965
16 days
1966
14 days
1967
24 days
1968
22 days
1969
18 days
1970
17 days
1971
15 days
1972
19 days
1973
22 days
1974
15 days
1975
18 days
1976
18 days
1977
16 days
1978
25 days
1979
19 days
1980
22 days
1981
41 days
1982
20 days
1983
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
66 years with a frost
Across 66 years with a frost, the median last spring frost at Fort Frances falls on 21 May and the median first autumn frost on 21 September, which leaves a median of 123 days between them.
In 1954 to 1983 the median growing season was 121 days. That is 5 days fewer than in 1893 to 1946.
Fitted over all years, the growing season changes by -0.7 days per decade at this station.
Frost dates and growing season at Fort Frances
Measure
Median, all years
Earliest period (1893 to 1946)
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
21 May
17 May
23 May
6 days later
+0.6 days per decade
First autumn frost
21 September
22 September
20 September
2 days earlier
0.0 days per decade
Growing days
123 days
126 days
121 days
5 days fewer
-0.7 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
71 years, 1893 to 1983
A day with at least 47.0 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 108.9 mm (4.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Fort Frances: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
47.0 mm (1.9 in)
5 years
63.4 mm (2.5 in)
10 years
74.3 mm (2.9 in)
25 years
88.2 mm (3.5 in)
50 years
98.6 mm (3.9 in)
100 years
108.9 mm (4.3 in)
Longer than the 71 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, 71 years of values from 1893 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: 113.8 mm (4.5 in) in 1966; 97.3 mm (3.8 in) in 1972; 83.8 mm (3.3 in) in 1941.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Fort Frances standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Fort Frances 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.