Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Atikokan Cli. 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 Atikokan Cli, 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)
-48.9 C (-56.0 F)
n/a
n/a
Feb
14.4 C (57.9 F)
-48.9 C (-56.0 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-46.7 C (-52.1 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-32.2 C (-26.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-13.9 C (7.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
-2.2 C (28.0 F)
n/a
n/a
Aug
35.0 C (95.0 F)
-6.7 C (19.9 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Nov
21.1 C (70.0 F)
-39.4 C (-38.9 F)
n/a
n/a
Dec
11.1 C (52.0 F)
-46.1 C (-51.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Atikokan Cli still stand. 1925 holds the most, with 69.
Standing records at Atikokan Cli by the year they were set
Year set
Standing records
1914
10
1915
39
1917
43
1918
25
1919
44
1920
38
1921
27
1922
36
1923
34
1924
47
1925
69
1926
23
1927
20
1928
43
1929
33
1930
36
1931
40
1932
37
1933
26
1934
34
1935
28
1936
54
1937
22
1938
20
1939
33
1940
25
1941
19
1942
28
1943
25
1944
16
1945
28
1946
30
1947
30
1948
11
1949
13
1950
15
1951
20
1952
25
1953
33
1954
18
1955
19
1956
19
1957
7
1958
30
1959
11
1960
9
1961
5
1962
19
1963
21
1964
23
1965
12
1966
19
1967
12
1968
22
1969
15
1970
18
1971
6
Wettest Day of Each Month
Oct: 92.7 mm (3.6 in)
The wettest day on record for each calendar month at Atikokan Cli. The most was 92.7 mm (3.6 in) on 5 October 1946.
Record daily precipitation for each month at Atikokan Cli
Month
Record daily precipitation (mm)
Date
Jan
20.3 mm (0.8 in)
14 January 1953
Feb
20.3 mm (0.8 in)
13 February 1938
Mar
30.5 mm (1.2 in)
12 March 1936
Apr
65.3 mm (2.6 in)
29 April 1940
May
50.8 mm (2.0 in)
18 May 1933
Jun
76.2 mm (3.0 in)
20 June 1926
Jul
63.5 mm (2.5 in)
9 July 1934
Aug
76.2 mm (3.0 in)
6 August 1933
Sep
80.8 mm (3.2 in)
21 September 1941
Oct
92.7 mm (3.6 in)
5 October 1946
Nov
52.8 mm (2.1 in)
20 November 1934
Dec
16.5 mm (0.6 in)
15 December 1927
Period of Record Coverage
1914 to 1971
Complete yearUnder 90 percent of days
57 years of record at Atikokan Cli, 1914 to 1971. 6 years have data for under 90 percent of days and are left out of rankings: 1914, 1915, 1918, 1924, 1964, 1971.
Cooler than the station meanWarmer than the station mean
One stripe for each of 37 complete years at Atikokan Cli, 1919 to 1970. Blue stripes are years cooler than the station's own mean of 1.9 C (35.3 F); red stripes are warmer. The coolest year was 1957, at 0.5 C (32.8 F), and the warmest was 1931, at 4.4 C (39.9 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Atikokan Cli as warming stripes, 1919 to 1970
Year
Annual mean temperature
Difference from the station mean
1919
1.9 C
+0.01 C
1920
2.1 C
+0.29 C
1921
3.7 C
+1.80 C
1922
3.0 C
+1.16 C
1927
1.2 C
-0.68 C
1928
1.9 C
+0.07 C
1929
0.6 C
-1.23 C
1930
2.1 C
+0.21 C
1931
4.4 C
+2.52 C
1932
1.4 C
-0.50 C
1933
1.2 C
-0.66 C
1934
1.3 C
-0.51 C
1935
1.8 C
-0.09 C
1936
0.9 C
-0.97 C
1937
0.8 C
-1.05 C
1938
2.0 C
+0.17 C
1939
1.6 C
-0.29 C
1940
1.3 C
-0.58 C
1941
3.1 C
+1.25 C
1942
1.5 C
-0.37 C
1947
1.4 C
-0.49 C
1948
2.0 C
+0.14 C
1949
2.2 C
+0.30 C
1951
1.3 C
-0.52 C
1952
2.9 C
+1.01 C
1953
3.1 C
+1.28 C
1956
1.1 C
-0.78 C
1957
0.5 C
-1.38 C
1958
0.8 C
-1.04 C
1959
0.8 C
-1.06 C
1961
3.0 C
+1.19 C
1963
2.6 C
+0.79 C
1966
1.5 C
-0.31 C
1967
1.2 C
-0.63 C
1968
2.6 C
+0.76 C
1969
2.2 C
+0.36 C
1970
1.8 C
-0.01 C
The fitted trend in annual mean temperature here over 1919 to 1970 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.3) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Atikokan Cli
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.3) per decade
1919 to 1970
37
Not clearly different from zero
Mean daily maximum
-0.17 C (-0.36 to 0.02) per decade
-0.30 F (-0.65 to 0.04) per decade
1919 to 1970
37
Not clearly different from zero
Mean daily minimum
0.1 C (-0.2 to 0.3) per decade
0.1 F (-0.4 to 0.6) per decade
1919 to 1970
37
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
1914 to 1971
Yearly extremes at Atikokan Cli: 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)
57
Coldest night (TNn)
-48.9 C (-56.0 F)
1939
-43.9 C (-47.0 F)
57
Wettest day (Rx1day)
92.7 mm (3.6 in)
1946
38.1 mm (1.5 in)
57
Wettest five days (Rx5day)
134.1 mm (5.3 in)
1941
54.6 mm (2.1 in)
57
Longest dry spell (CDD)
34 days
1958
21 days
57
Hottest day (TXx)
The hottest day of the year at Atikokan Cli, 1914 to 1971. 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 Atikokan Cli by year
Year
Hottest day (TXx)
1914
32.2 C (90.0 F)
1915
36.7 C (98.1 F)
1917
36.1 C (97.0 F)
1918
31.7 C (89.1 F)
1919
35.0 C (95.0 F)
1920
33.9 C (93.0 F)
1921
36.7 C (98.1 F)
1922
34.4 C (93.9 F)
1923
33.3 C (91.9 F)
1924
26.7 C (80.1 F)
1925
32.2 C (90.0 F)
1926
32.8 C (91.0 F)
1927
32.2 C (90.0 F)
1928
31.1 C (88.0 F)
1929
36.7 C (98.1 F)
1930
34.4 C (93.9 F)
1931
37.8 C (100.0 F)
1932
35.0 C (95.0 F)
1933
37.2 C (99.0 F)
1934
32.8 C (91.0 F)
1935
33.9 C (93.0 F)
1936
42.2 C (108.0 F)
1937
34.4 C (93.9 F)
1938
31.7 C (89.1 F)
1939
34.4 C (93.9 F)
1940
35.6 C (96.1 F)
1941
35.0 C (95.0 F)
1942
31.1 C (88.0 F)
1943
33.3 C (91.9 F)
1944
31.7 C (89.1 F)
1945
33.3 C (91.9 F)
1946
32.2 C (90.0 F)
1947
34.4 C (93.9 F)
1948
35.6 C (96.1 F)
1949
34.4 C (93.9 F)
1950
32.2 C (90.0 F)
1951
32.8 C (91.0 F)
1952
32.8 C (91.0 F)
1953
35.0 C (95.0 F)
1954
32.2 C (90.0 F)
1955
34.4 C (93.9 F)
1956
34.4 C (93.9 F)
1957
31.1 C (88.0 F)
1958
31.7 C (89.1 F)
1959
33.9 C (93.0 F)
1960
30.6 C (87.1 F)
1961
33.3 C (91.9 F)
1962
30.6 C (87.1 F)
1963
32.2 C (90.0 F)
1964
32.8 C (91.0 F)
1965
30.6 C (87.1 F)
1966
35.0 C (95.0 F)
1967
31.7 C (89.1 F)
1968
30.0 C (86.0 F)
1969
33.9 C (93.0 F)
1970
32.2 C (90.0 F)
1971
29.4 C (84.9 F)
Coldest night (TNn)
The coldest night of the year at Atikokan Cli, 1914 to 1971. The record is -48.9 C (-56.0 F) in 1939, marked on the chart; the median year is -43.9 C (-47.0 F).
Coldest night (TNn) at Atikokan Cli by year
Year
Coldest night (TNn)
1914
-6.7 C (19.9 F)
1915
-40.0 C (-40.0 F)
1917
-45.6 C (-50.1 F)
1918
-44.4 C (-47.9 F)
1919
-43.9 C (-47.0 F)
1920
-41.7 C (-43.1 F)
1921
-41.1 C (-42.0 F)
1922
-44.4 C (-47.9 F)
1923
-44.4 C (-47.9 F)
1924
-41.1 C (-42.0 F)
1925
-43.3 C (-45.9 F)
1926
-41.1 C (-42.0 F)
1927
-44.4 C (-47.9 F)
1928
-41.1 C (-42.0 F)
1929
-42.8 C (-45.0 F)
1930
-45.0 C (-49.0 F)
1931
-40.0 C (-40.0 F)
1932
-45.6 C (-50.1 F)
1933
-48.3 C (-54.9 F)
1934
-47.2 C (-53.0 F)
1935
-45.6 C (-50.1 F)
1936
-43.9 C (-47.0 F)
1937
-45.6 C (-50.1 F)
1938
-46.7 C (-52.1 F)
1939
-48.9 C (-56.0 F)
1940
-43.9 C (-47.0 F)
1941
-43.3 C (-45.9 F)
1942
-45.0 C (-49.0 F)
1943
-48.9 C (-56.0 F)
1944
-42.8 C (-45.0 F)
1945
-44.4 C (-47.9 F)
1946
-46.1 C (-51.0 F)
1947
-44.4 C (-47.9 F)
1948
-42.8 C (-45.0 F)
1949
-41.1 C (-42.0 F)
1950
-46.7 C (-52.1 F)
1951
-45.6 C (-50.1 F)
1952
-40.0 C (-40.0 F)
1953
-42.8 C (-45.0 F)
1954
-44.4 C (-47.9 F)
1955
-43.3 C (-45.9 F)
1956
-40.0 C (-40.0 F)
1957
-47.2 C (-53.0 F)
1958
-43.9 C (-47.0 F)
1959
-43.9 C (-47.0 F)
1960
-35.6 C (-32.1 F)
1961
-41.7 C (-43.1 F)
1962
-42.8 C (-45.0 F)
1963
-43.9 C (-47.0 F)
1964
-40.0 C (-40.0 F)
1965
-42.2 C (-44.0 F)
1966
-43.9 C (-47.0 F)
1967
-43.9 C (-47.0 F)
1968
-41.7 C (-43.1 F)
1969
-39.4 C (-38.9 F)
1970
-42.2 C (-44.0 F)
1971
-35.6 C (-32.1 F)
Wettest day (Rx1day)
The wettest day of the year at Atikokan Cli, 1914 to 1971. The record is 92.7 mm (3.6 in) in 1946, marked on the chart; the median year is 38.1 mm (1.5 in).
Wettest day (Rx1day) at Atikokan Cli by year
Year
Wettest day (Rx1day)
1914
28.4 mm (1.1 in)
1915
58.4 mm (2.3 in)
1917
20.3 mm (0.8 in)
1918
35.6 mm (1.4 in)
1919
27.7 mm (1.1 in)
1920
65.3 mm (2.6 in)
1921
33.5 mm (1.3 in)
1922
39.4 mm (1.6 in)
1923
54.6 mm (2.1 in)
1924
45.2 mm (1.8 in)
1925
38.1 mm (1.5 in)
1926
76.2 mm (3.0 in)
1927
39.4 mm (1.6 in)
1928
39.4 mm (1.6 in)
1929
23.6 mm (0.9 in)
1930
32.8 mm (1.3 in)
1931
38.9 mm (1.5 in)
1932
59.2 mm (2.3 in)
1933
76.2 mm (3.0 in)
1934
63.5 mm (2.5 in)
1935
55.1 mm (2.2 in)
1936
30.5 mm (1.2 in)
1937
53.3 mm (2.1 in)
1938
47.5 mm (1.9 in)
1939
55.9 mm (2.2 in)
1940
65.3 mm (2.6 in)
1941
80.8 mm (3.2 in)
1942
34.5 mm (1.4 in)
1943
54.6 mm (2.1 in)
1944
71.6 mm (2.8 in)
1945
27.2 mm (1.1 in)
1946
92.7 mm (3.6 in)
1947
46.2 mm (1.8 in)
1948
38.1 mm (1.5 in)
1949
41.1 mm (1.6 in)
1950
38.1 mm (1.5 in)
1951
25.4 mm (1.0 in)
1952
31.8 mm (1.3 in)
1953
21.1 mm (0.8 in)
1954
25.4 mm (1.0 in)
1955
26.7 mm (1.1 in)
1956
29.0 mm (1.1 in)
1957
38.1 mm (1.5 in)
1958
16.0 mm (0.6 in)
1959
32.5 mm (1.3 in)
1960
32.0 mm (1.3 in)
1961
27.9 mm (1.1 in)
1962
15.2 mm (0.6 in)
1963
30.5 mm (1.2 in)
1964
40.6 mm (1.6 in)
1965
25.4 mm (1.0 in)
1966
40.1 mm (1.6 in)
1967
12.7 mm (0.5 in)
1968
20.3 mm (0.8 in)
1969
26.7 mm (1.1 in)
1970
27.9 mm (1.1 in)
1971
12.7 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Atikokan Cli, 1914 to 1971. The record is 134.1 mm (5.3 in) in 1941, marked on the chart; the median year is 54.6 mm (2.1 in).
Wettest five days (Rx5day) at Atikokan Cli by year
Year
Wettest five days (Rx5day)
1914
56.1 mm (2.2 in)
1915
78.7 mm (3.1 in)
1917
29.2 mm (1.1 in)
1918
39.4 mm (1.6 in)
1919
52.1 mm (2.1 in)
1920
71.1 mm (2.8 in)
1921
60.2 mm (2.4 in)
1922
45.0 mm (1.8 in)
1923
99.1 mm (3.9 in)
1924
55.3 mm (2.2 in)
1925
46.2 mm (1.8 in)
1926
100.6 mm (4.0 in)
1927
55.4 mm (2.2 in)
1928
65.6 mm (2.6 in)
1929
36.4 mm (1.4 in)
1930
43.7 mm (1.7 in)
1931
57.2 mm (2.3 in)
1932
70.6 mm (2.8 in)
1933
81.8 mm (3.2 in)
1934
67.3 mm (2.6 in)
1935
85.3 mm (3.4 in)
1936
46.2 mm (1.8 in)
1937
75.7 mm (3.0 in)
1938
71.2 mm (2.8 in)
1939
81.3 mm (3.2 in)
1940
83.0 mm (3.3 in)
1941
134.1 mm (5.3 in)
1942
54.6 mm (2.1 in)
1943
76.4 mm (3.0 in)
1944
84.7 mm (3.3 in)
1945
56.9 mm (2.2 in)
1946
92.7 mm (3.6 in)
1947
83.8 mm (3.3 in)
1948
50.3 mm (2.0 in)
1949
57.1 mm (2.2 in)
1950
48.2 mm (1.9 in)
1951
43.9 mm (1.7 in)
1952
31.8 mm (1.3 in)
1953
38.4 mm (1.5 in)
1954
63.6 mm (2.5 in)
1955
54.6 mm (2.1 in)
1956
45.9 mm (1.8 in)
1957
46.7 mm (1.8 in)
1958
26.5 mm (1.0 in)
1959
34.6 mm (1.4 in)
1960
40.4 mm (1.6 in)
1961
44.4 mm (1.7 in)
1962
30.5 mm (1.2 in)
1963
62.4 mm (2.5 in)
1964
42.4 mm (1.7 in)
1965
41.6 mm (1.6 in)
1966
41.4 mm (1.6 in)
1967
29.4 mm (1.2 in)
1968
28.6 mm (1.1 in)
1969
36.3 mm (1.4 in)
1970
39.3 mm (1.5 in)
1971
20.3 mm (0.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Atikokan Cli, 1914 to 1971. The record is 34 days in 1958, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Atikokan Cli by year
Year
Longest dry spell (CDD)
1914
15 days
1915
25 days
1917
17 days
1918
18 days
1919
25 days
1920
30 days
1921
18 days
1922
19 days
1923
28 days
1924
19 days
1925
23 days
1926
18 days
1927
19 days
1928
30 days
1929
18 days
1930
17 days
1931
33 days
1932
19 days
1933
14 days
1934
23 days
1935
19 days
1936
24 days
1937
16 days
1938
21 days
1939
21 days
1940
20 days
1941
25 days
1942
33 days
1943
21 days
1944
28 days
1945
23 days
1946
21 days
1947
23 days
1948
26 days
1949
22 days
1950
20 days
1951
16 days
1952
26 days
1953
25 days
1954
14 days
1955
16 days
1956
22 days
1957
25 days
1958
34 days
1959
21 days
1960
23 days
1961
25 days
1962
28 days
1963
20 days
1964
17 days
1965
17 days
1966
16 days
1967
20 days
1968
20 days
1969
31 days
1970
16 days
1971
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
37 years with a frost
Across 37 years with a frost, the median last spring frost at Atikokan Cli falls on 14 June and the median first autumn frost on 27 August, which leaves a median of 73 days between them.
Fitted over all years, the growing season changes by +5.4 days per decade at this station.
Frost dates and growing season at Atikokan Cli
Measure
Median, all years
Earliest period
Recent period (1930 to 1970)
Recent against earliest
Fitted trend
Last spring frost
14 June
n/a
15 June
n/a
-1.0 days per decade
First autumn frost
27 August
n/a
27 August
n/a
+4.4 days per decade
Growing days
73 days
n/a
73 days
n/a
+5.4 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
42 years, 1919 to 1970
A day with at least 40.7 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 107.4 mm (4.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Atikokan Cli: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
40.7 mm (1.6 in)
5 years
57.2 mm (2.3 in)
10 years
68.7 mm (2.7 in)
25 years
83.8 mm (3.3 in)
50 years
95.4 mm (3.8 in)
Longer than the 42 years of record
100 years
107.4 mm (4.2 in)
Longer than the 42 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, 42 years of values from 1919 to 1970.
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: 92.7 mm (3.6 in) in 1946; 80.8 mm (3.2 in) in 1941; 76.2 mm (3.0 in) in 1926.
Download the Data
Data for Atikokan Cli standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Atikokan Cli 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.