Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Island Falls. 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 Island Falls, 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
11.7 C (53.1 F)
-47.8 C (-54.0 F)
n/a
n/a
Mar
15.0 C (59.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Apr
28.5 C (83.3 F)
-35.0 C (-31.0 F)
n/a
n/a
May
32.8 C (91.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Jun
34.4 C (93.9 F)
-3.5 C (25.7 F)
n/a
n/a
Jul
36.1 C (97.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
33.9 C (93.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
33.3 C (91.9 F)
-8.3 C (17.1 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-21.7 C (-7.1 F)
n/a
n/a
Nov
13.0 C (55.4 F)
-37.8 C (-36.0 F)
n/a
n/a
Dec
7.8 C (46.0 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 Island Falls still stand. 1936 holds the most, with 55.
Standing records at Island Falls by the year they were set
Year set
Standing records
1929
14
1930
30
1931
14
1932
31
1933
37
1934
40
1935
41
1936
55
1937
27
1938
35
1939
36
1940
28
1941
30
1942
38
1943
45
1944
40
1945
29
1946
28
1947
24
1948
28
1949
20
1950
24
1951
25
1952
16
1953
29
1954
35
1955
42
1956
26
1957
17
1958
28
1959
24
1960
13
1961
31
1962
26
1963
21
1964
27
1965
13
1966
20
1967
28
1968
20
1969
21
1970
26
1971
11
1972
43
1973
23
1974
24
1975
8
1976
13
1977
32
1978
14
1979
18
1980
26
1981
29
1982
19
1983
22
Wettest Day of Each Month
Jul: 68.8 mm (2.7 in)
The wettest day on record for each calendar month at Island Falls. The most was 68.8 mm (2.7 in) on 7 July 1957.
Record daily precipitation for each month at Island Falls
Month
Record daily precipitation (mm)
Date
Jan
18.8 mm (0.7 in)
16 January 1951
Feb
20.3 mm (0.8 in)
27 February 1933
Mar
21.6 mm (0.9 in)
22 March 1953
Apr
17.8 mm (0.7 in)
4 April 1939
May
51.3 mm (2.0 in)
30 May 1949
Jun
66.8 mm (2.6 in)
30 June 1955
Jul
68.8 mm (2.7 in)
7 July 1957
Aug
54.1 mm (2.1 in)
14 August 1943
Sep
66.3 mm (2.6 in)
26 September 1971
Oct
23.1 mm (0.9 in)
12 October 1954
Nov
31.8 mm (1.3 in)
5 November 1947
Dec
20.3 mm (0.8 in)
17 December 1967
Period of Record Coverage
1929 to 1983
Complete yearUnder 90 percent of days
55 years of record at Island Falls, 1929 to 1983. 3 years have data for under 90 percent of days and are left out of rankings: 1929, 1930, 1931.
Cooler than the station meanWarmer than the station mean
One stripe for each of 52 complete years at Island Falls, 1932 to 1983. Blue stripes are years cooler than the station's own mean of -2.0 C (28.4 F); red stripes are warmer. The coolest year was 1933, at -4.2 C (24.5 F), and the warmest was 1981, at 0.2 C (32.4 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Island Falls as warming stripes, 1932 to 1983
Year
Annual mean temperature
Difference from the station mean
1932
-2.8 C
-0.85 C
1933
-4.2 C
-2.20 C
1934
-2.1 C
-0.07 C
1935
-2.2 C
-0.18 C
1936
-3.7 C
-1.76 C
1937
-2.4 C
-0.38 C
1938
-0.7 C
+1.32 C
1939
-2.1 C
-0.16 C
1940
-0.6 C
+1.34 C
1941
-0.8 C
+1.15 C
1942
-1.3 C
+0.64 C
1943
-1.5 C
+0.50 C
1944
-0.6 C
+1.40 C
1945
-2.4 C
-0.43 C
1946
-1.9 C
+0.06 C
1947
-2.3 C
-0.30 C
1948
-1.3 C
+0.70 C
1949
-2.0 C
+0.03 C
1950
-4.0 C
-2.01 C
1951
-3.4 C
-1.40 C
1952
-0.7 C
+1.25 C
1953
-0.8 C
+1.17 C
1954
-1.3 C
+0.66 C
1955
-2.2 C
-0.17 C
1956
-2.3 C
-0.31 C
1957
-2.2 C
-0.21 C
1958
-1.2 C
+0.78 C
1959
-2.1 C
-0.09 C
1960
-1.8 C
+0.14 C
1961
-1.7 C
+0.28 C
1962
-2.1 C
-0.14 C
1963
-1.3 C
+0.69 C
1964
-1.9 C
+0.06 C
1965
-2.9 C
-0.87 C
1966
-2.7 C
-0.76 C
1967
-2.9 C
-0.95 C
1968
-1.9 C
+0.13 C
1969
-2.4 C
-0.38 C
1970
-2.5 C
-0.54 C
1971
-1.6 C
+0.37 C
1972
-3.6 C
-1.64 C
1973
-1.0 C
+0.98 C
1974
-2.5 C
-0.53 C
1975
-1.9 C
+0.04 C
1976
-1.3 C
+0.66 C
1977
-0.7 C
+1.33 C
1978
-2.5 C
-0.49 C
1979
-3.0 C
-1.00 C
1980
-1.3 C
+0.65 C
1981
0.2 C
+2.22 C
1982
-3.7 C
-1.74 C
1983
-1.0 C
+0.96 C
The fitted trend in annual mean temperature here over 1932 to 1983 is 0.05 C (-0.13 to 0.23) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 52 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Island Falls
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.05 C (-0.13 to 0.23) per decade
0.1 F (-0.2 to 0.4) per decade
1932 to 1983
52
Not clearly different from zero
Mean daily maximum
0.05 C (-0.17 to 0.27) per decade
0.1 F (-0.3 to 0.5) per decade
1932 to 1983
52
Not clearly different from zero
Mean daily minimum
0.05 C (-0.12 to 0.21) per decade
0.1 F (-0.2 to 0.4) per decade
1932 to 1983
52
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
1929 to 1983
Yearly extremes at Island Falls: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
1941
31.7 C (89.1 F)
55
Coldest night (TNn)
-48.9 C (-56.0 F)
1943
-44.4 C (-47.9 F)
55
Wettest day (Rx1day)
68.8 mm (2.7 in)
1957
35.4 mm (1.4 in)
55
Wettest five days (Rx5day)
124.0 mm (4.9 in)
1976
56.2 mm (2.2 in)
55
Longest dry spell (CDD)
61 days
1980
22 days
55
Hottest day (TXx)
The hottest day of the year at Island Falls, 1929 to 1983. The record is 36.1 C (97.0 F) in 1941, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Island Falls by year
Year
Hottest day (TXx)
1929
22.2 C (72.0 F)
1930
32.2 C (90.0 F)
1931
31.7 C (89.1 F)
1932
28.9 C (84.0 F)
1933
30.0 C (86.0 F)
1934
30.6 C (87.1 F)
1935
31.7 C (89.1 F)
1936
34.4 C (93.9 F)
1937
33.9 C (93.0 F)
1938
32.8 C (91.0 F)
1939
30.0 C (86.0 F)
1940
33.9 C (93.0 F)
1941
36.1 C (97.0 F)
1942
31.7 C (89.1 F)
1943
32.2 C (90.0 F)
1944
34.4 C (93.9 F)
1945
32.8 C (91.0 F)
1946
31.7 C (89.1 F)
1947
32.2 C (90.0 F)
1948
32.2 C (90.0 F)
1949
32.2 C (90.0 F)
1950
35.0 C (95.0 F)
1951
30.0 C (86.0 F)
1952
26.1 C (79.0 F)
1953
33.9 C (93.0 F)
1954
32.8 C (91.0 F)
1955
32.8 C (91.0 F)
1956
34.4 C (93.9 F)
1957
28.9 C (84.0 F)
1958
29.4 C (84.9 F)
1959
30.6 C (87.1 F)
1960
33.3 C (91.9 F)
1961
33.9 C (93.0 F)
1962
31.7 C (89.1 F)
1963
32.2 C (90.0 F)
1964
31.7 C (89.1 F)
1965
28.3 C (82.9 F)
1966
28.9 C (84.0 F)
1967
33.3 C (91.9 F)
1968
27.8 C (82.0 F)
1969
32.2 C (90.0 F)
1970
33.3 C (91.9 F)
1971
31.1 C (88.0 F)
1972
30.0 C (86.0 F)
1973
30.6 C (87.1 F)
1974
31.7 C (89.1 F)
1975
32.2 C (90.0 F)
1976
30.0 C (86.0 F)
1977
28.3 C (82.9 F)
1978
31.0 C (87.8 F)
1979
33.0 C (91.4 F)
1980
31.0 C (87.8 F)
1981
33.0 C (91.4 F)
1982
31.0 C (87.8 F)
1983
33.0 C (91.4 F)
Coldest night (TNn)
The coldest night of the year at Island Falls, 1929 to 1983. The record is -48.9 C (-56.0 F) in 1943, marked on the chart; the median year is -44.4 C (-47.9 F).
Coldest night (TNn) at Island Falls by year
Year
Coldest night (TNn)
1929
-37.8 C (-36.0 F)
1930
-43.3 C (-45.9 F)
1931
-32.2 C (-26.0 F)
1932
-46.7 C (-52.1 F)
1933
-46.1 C (-51.0 F)
1934
-46.1 C (-51.0 F)
1935
-45.6 C (-50.1 F)
1936
-47.8 C (-54.0 F)
1937
-45.6 C (-50.1 F)
1938
-44.4 C (-47.9 F)
1939
-44.4 C (-47.9 F)
1940
-42.8 C (-45.0 F)
1941
-43.3 C (-45.9 F)
1942
-42.2 C (-44.0 F)
1943
-48.9 C (-56.0 F)
1944
-42.2 C (-44.0 F)
1945
-43.3 C (-45.9 F)
1946
-47.2 C (-53.0 F)
1947
-46.7 C (-52.1 F)
1948
-41.7 C (-43.1 F)
1949
-43.9 C (-47.0 F)
1950
-45.0 C (-49.0 F)
1951
-45.6 C (-50.1 F)
1952
-43.9 C (-47.0 F)
1953
-43.3 C (-45.9 F)
1954
-46.1 C (-51.0 F)
1955
-43.3 C (-45.9 F)
1956
-45.6 C (-50.1 F)
1957
-45.6 C (-50.1 F)
1958
-45.0 C (-49.0 F)
1959
-43.9 C (-47.0 F)
1960
-42.2 C (-44.0 F)
1961
-42.2 C (-44.0 F)
1962
-43.9 C (-47.0 F)
1963
-45.0 C (-49.0 F)
1964
-43.9 C (-47.0 F)
1965
-46.1 C (-51.0 F)
1966
-45.0 C (-49.0 F)
1967
-47.2 C (-53.0 F)
1968
-46.1 C (-51.0 F)
1969
-45.0 C (-49.0 F)
1970
-43.3 C (-45.9 F)
1971
-43.3 C (-45.9 F)
1972
-44.4 C (-47.9 F)
1973
-44.4 C (-47.9 F)
1974
-46.1 C (-51.0 F)
1975
-42.8 C (-45.0 F)
1976
-41.7 C (-43.1 F)
1977
-43.9 C (-47.0 F)
1978
-45.6 C (-50.1 F)
1979
-41.5 C (-42.7 F)
1980
-40.5 C (-40.9 F)
1981
-45.5 C (-49.9 F)
1982
-45.5 C (-49.9 F)
1983
-46.0 C (-50.8 F)
Wettest day (Rx1day)
The wettest day of the year at Island Falls, 1929 to 1983. The record is 68.8 mm (2.7 in) in 1957, marked on the chart; the median year is 35.4 mm (1.4 in).
Wettest day (Rx1day) at Island Falls by year
Year
Wettest day (Rx1day)
1929
41.1 mm (1.6 in)
1930
17.8 mm (0.7 in)
1931
45.7 mm (1.8 in)
1932
50.0 mm (2.0 in)
1933
58.4 mm (2.3 in)
1934
30.5 mm (1.2 in)
1935
23.9 mm (0.9 in)
1936
34.0 mm (1.3 in)
1937
32.0 mm (1.3 in)
1938
28.7 mm (1.1 in)
1939
32.5 mm (1.3 in)
1940
21.6 mm (0.9 in)
1941
52.8 mm (2.1 in)
1942
27.9 mm (1.1 in)
1943
54.1 mm (2.1 in)
1944
25.7 mm (1.0 in)
1945
39.4 mm (1.6 in)
1946
23.6 mm (0.9 in)
1947
31.8 mm (1.3 in)
1948
49.8 mm (2.0 in)
1949
51.8 mm (2.0 in)
1950
22.1 mm (0.9 in)
1951
30.0 mm (1.2 in)
1952
26.7 mm (1.1 in)
1953
21.6 mm (0.9 in)
1954
46.7 mm (1.8 in)
1955
66.8 mm (2.6 in)
1956
20.3 mm (0.8 in)
1957
68.8 mm (2.7 in)
1958
50.8 mm (2.0 in)
1959
33.0 mm (1.3 in)
1960
43.2 mm (1.7 in)
1961
43.9 mm (1.7 in)
1962
25.7 mm (1.0 in)
1963
39.4 mm (1.6 in)
1964
44.7 mm (1.8 in)
1965
16.8 mm (0.7 in)
1966
33.5 mm (1.3 in)
1967
24.9 mm (1.0 in)
1968
35.6 mm (1.4 in)
1969
51.8 mm (2.0 in)
1970
35.8 mm (1.4 in)
1971
66.3 mm (2.6 in)
1972
39.6 mm (1.6 in)
1973
37.3 mm (1.5 in)
1974
38.4 mm (1.5 in)
1975
24.1 mm (0.9 in)
1976
45.5 mm (1.8 in)
1977
39.4 mm (1.6 in)
1978
32.2 mm (1.3 in)
1979
21.3 mm (0.8 in)
1980
35.4 mm (1.4 in)
1981
18.9 mm (0.7 in)
1982
33.5 mm (1.3 in)
1983
59.5 mm (2.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Island Falls, 1929 to 1983. The record is 124.0 mm (4.9 in) in 1976, marked on the chart; the median year is 56.2 mm (2.2 in).
Wettest five days (Rx5day) at Island Falls by year
Year
Wettest five days (Rx5day)
1929
54.3 mm (2.1 in)
1930
36.1 mm (1.4 in)
1931
57.9 mm (2.3 in)
1932
62.7 mm (2.5 in)
1933
79.8 mm (3.1 in)
1934
41.3 mm (1.6 in)
1935
33.1 mm (1.3 in)
1936
35.3 mm (1.4 in)
1937
41.2 mm (1.6 in)
1938
33.3 mm (1.3 in)
1939
34.8 mm (1.4 in)
1940
28.4 mm (1.1 in)
1941
58.6 mm (2.3 in)
1942
43.1 mm (1.7 in)
1943
87.6 mm (3.4 in)
1944
48.4 mm (1.9 in)
1945
61.8 mm (2.4 in)
1946
32.3 mm (1.3 in)
1947
46.8 mm (1.8 in)
1948
62.5 mm (2.5 in)
1949
83.9 mm (3.3 in)
1950
49.5 mm (1.9 in)
1951
56.2 mm (2.2 in)
1952
38.6 mm (1.5 in)
1953
40.1 mm (1.6 in)
1954
69.3 mm (2.7 in)
1955
92.7 mm (3.6 in)
1956
34.8 mm (1.4 in)
1957
76.9 mm (3.0 in)
1958
74.8 mm (2.9 in)
1959
47.2 mm (1.9 in)
1960
50.6 mm (2.0 in)
1961
52.5 mm (2.1 in)
1962
42.4 mm (1.7 in)
1963
56.8 mm (2.2 in)
1964
72.4 mm (2.9 in)
1965
42.7 mm (1.7 in)
1966
43.6 mm (1.7 in)
1967
38.4 mm (1.5 in)
1968
63.5 mm (2.5 in)
1969
61.5 mm (2.4 in)
1970
77.7 mm (3.1 in)
1971
77.2 mm (3.0 in)
1972
76.2 mm (3.0 in)
1973
61.5 mm (2.4 in)
1974
72.3 mm (2.8 in)
1975
56.5 mm (2.2 in)
1976
124.0 mm (4.9 in)
1977
71.2 mm (2.8 in)
1978
47.0 mm (1.9 in)
1979
33.2 mm (1.3 in)
1980
58.2 mm (2.3 in)
1981
31.0 mm (1.2 in)
1982
57.7 mm (2.3 in)
1983
73.6 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Island Falls, 1929 to 1983. The record is 61 days in 1980, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Island Falls by year
Year
Longest dry spell (CDD)
1929
16 days
1930
20 days
1931
15 days
1932
21 days
1933
16 days
1934
20 days
1935
29 days
1936
16 days
1937
36 days
1938
19 days
1939
21 days
1940
22 days
1941
21 days
1942
29 days
1943
24 days
1944
36 days
1945
27 days
1946
21 days
1947
16 days
1948
21 days
1949
22 days
1950
36 days
1951
52 days
1952
44 days
1953
31 days
1954
34 days
1955
16 days
1956
16 days
1957
19 days
1958
17 days
1959
33 days
1960
21 days
1961
17 days
1962
25 days
1963
31 days
1964
27 days
1965
21 days
1966
23 days
1967
23 days
1968
28 days
1969
19 days
1970
20 days
1971
15 days
1972
22 days
1973
31 days
1974
28 days
1975
24 days
1976
25 days
1977
20 days
1978
30 days
1979
23 days
1980
61 days
1981
34 days
1982
26 days
1983
15 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
52 years with a frost
Across 52 years with a frost, the median last spring frost at Island Falls falls on 4 June and the median first autumn frost on 13 September, which leaves a median of 103 days between them.
Fitted over all years, the growing season changes by +2.7 days per decade at this station.
Frost dates and growing season at Island Falls
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
4 June
n/a
31 May
n/a
-2.3 days per decade
First autumn frost
13 September
n/a
13 September
n/a
+0.4 days per decade
Growing days
103 days
n/a
107 days
n/a
+2.7 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
52 years, 1932 to 1983
A day with at least 35.3 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 78.9 mm (3.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Island Falls: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
35.3 mm (1.4 in)
5 years
47.6 mm (1.9 in)
10 years
55.5 mm (2.2 in)
25 years
65.1 mm (2.6 in)
50 years
72.1 mm (2.8 in)
100 years
78.9 mm (3.1 in)
Longer than the 52 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, 52 years of values from 1932 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: 68.8 mm (2.7 in) in 1957; 66.8 mm (2.6 in) in 1955; 66.3 mm (2.6 in) in 1971.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Island Falls, at 1973. Each is measured against neighbouring stations.
Relative to 4 neighbouring stations, the station's annual mean temperature from 1973 ran 0.4 C (0.8 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Island Falls, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1973
-0.4
-0.8
likely
4
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 Island Falls standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Island Falls 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.