Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Big Trout Lake. 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 Big Trout Lake, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
1.7 C (35.1 F)
-47.8 C (-54.0 F)
n/a
n/a
Feb
7.7 C (45.9 F)
-46.7 C (-52.1 F)
n/a
n/a
Mar
12.2 C (54.0 F)
-42.2 C (-44.0 F)
n/a
n/a
Apr
24.4 C (75.9 F)
-32.8 C (-27.0 F)
n/a
n/a
May
30.0 C (86.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Jun
31.7 C (89.1 F)
-7.2 C (19.0 F)
n/a
n/a
Jul
35.6 C (96.1 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
32.8 C (91.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
30.6 C (87.1 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
24.4 C (75.9 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
12.2 C (54.0 F)
-33.9 C (-29.0 F)
n/a
n/a
Dec
4.7 C (40.5 F)
-44.4 C (-47.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Big Trout Lake still stand. 1972 holds the most, with 53.
Standing records at Big Trout Lake by the year they were set
Year set
Standing records
1939
36
1940
40
1941
37
1942
52
1943
28
1944
22
1945
37
1946
42
1947
47
1948
38
1949
33
1950
38
1951
36
1952
36
1953
36
1954
23
1955
42
1956
27
1957
27
1958
28
1959
27
1960
20
1961
17
1962
33
1963
46
1964
42
1965
27
1966
20
1967
34
1968
28
1969
28
1970
21
1971
20
1972
53
1973
28
1974
27
1975
37
1976
30
1977
41
1978
20
1979
32
1980
25
1981
36
1982
34
1983
33
All-Time Record Progression
1 new records
1 all-time records were set at Big Trout Lake between 25 October 1975 and 25 October 1975. Each dot is a new record.
When Big Trout Lake set new all-time records
Date
Kind
Detail
1975-10-25
Record daily snowfall
Record daily snowfall 36.8 cm (14.5 in)
Wettest Day of Each Month
Aug: 84.1 mm (3.3 in)
The wettest day on record for each calendar month at Big Trout Lake. The most was 84.1 mm (3.3 in) on 29 August 1955.
Record daily precipitation for each month at Big Trout Lake
Month
Record daily precipitation (mm)
Date
Jan
28.4 mm (1.1 in)
13 January 1942
Feb
18.3 mm (0.7 in)
25 February 1975
Mar
24.4 mm (1.0 in)
27 March 1973
Apr
33.0 mm (1.3 in)
25 April 1948
May
33.8 mm (1.3 in)
22 May 1974
Jun
60.9 mm (2.4 in)
22 June 1983
Jul
75.2 mm (3.0 in)
18 July 1940
Aug
84.1 mm (3.3 in)
29 August 1955
Sep
83.8 mm (3.3 in)
1 September 1973
Oct
37.3 mm (1.5 in)
11 October 1961
Nov
30.5 mm (1.2 in)
16 November 1946
Dec
18.5 mm (0.7 in)
1 December 1939
Period of Record Coverage
1939 to 1983
Complete yearUnder 90 percent of days
45 years of record at Big Trout Lake, 1939 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1939, 1953.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Big Trout Lake, 1942 to 1983. Blue stripes are years cooler than the station's own mean of -3.0 C (26.5 F); red stripes are warmer. The coolest year was 1950, at -5.3 C (22.5 F), and the warmest was 1981, at -0.7 C (30.7 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Big Trout Lake as warming stripes, 1942 to 1983
Year
Annual mean temperature
Difference from the station mean
1942
-3.0 C
+0.07 C
1943
-3.4 C
-0.37 C
1944
-2.1 C
+0.90 C
1946
-3.3 C
-0.32 C
1947
-3.6 C
-0.54 C
1948
-1.8 C
+1.23 C
1949
-3.7 C
-0.64 C
1950
-5.3 C
-2.26 C
1951
-3.2 C
-0.22 C
1952
-1.8 C
+1.20 C
1954
-2.7 C
+0.34 C
1955
-2.0 C
+1.06 C
1956
-3.8 C
-0.74 C
1957
-2.8 C
+0.18 C
1958
-3.1 C
-0.05 C
1959
-3.9 C
-0.87 C
1960
-2.9 C
+0.09 C
1961
-2.4 C
+0.67 C
1962
-3.3 C
-0.30 C
1963
-3.1 C
-0.06 C
1964
-3.4 C
-0.42 C
1965
-3.9 C
-0.92 C
1966
-3.5 C
-0.51 C
1967
-3.8 C
-0.82 C
1968
-2.3 C
+0.77 C
1969
-2.5 C
+0.48 C
1970
-3.3 C
-0.26 C
1971
-2.3 C
+0.70 C
1972
-4.8 C
-1.82 C
1973
-2.3 C
+0.77 C
1974
-4.1 C
-1.05 C
1975
-2.3 C
+0.68 C
1976
-3.3 C
-0.25 C
1977
-1.4 C
+1.66 C
1978
-3.9 C
-0.83 C
1979
-3.4 C
-0.33 C
1980
-3.1 C
-0.06 C
1981
-0.7 C
+2.32 C
1982
-3.5 C
-0.46 C
1983
-2.0 C
+0.99 C
The fitted trend in annual mean temperature here over 1942 to 1983 is 0.1 C (-0.2 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.3 to 0.6) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Big Trout Lake
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.2 to 0.3) per decade
0.2 F (-0.3 to 0.6) per decade
1942 to 1983
40
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.2 to 0.6) per decade
1942 to 1983
40
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
1942 to 1983
40
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
1939 to 1983
Yearly extremes at Big Trout Lake: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.6 C (96.1 F)
1955
30.0 C (86.0 F)
45
Coldest night (TNn)
-47.8 C (-54.0 F)
1951
-42.8 C (-45.0 F)
45
Wettest day (Rx1day)
84.1 mm (3.3 in)
1955
33.8 mm (1.3 in)
45
Wettest five days (Rx5day)
104.4 mm (4.1 in)
1949
60.9 mm (2.4 in)
45
Longest dry spell (CDD)
45 days
1939
21 days
45
Hottest day (TXx)
The hottest day of the year at Big Trout Lake, 1939 to 1983. The record is 35.6 C (96.1 F) in 1955, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Big Trout Lake by year
Year
Hottest day (TXx)
1939
26.1 C (79.0 F)
1940
30.6 C (87.1 F)
1941
35.0 C (95.0 F)
1942
27.2 C (81.0 F)
1943
30.0 C (86.0 F)
1944
27.2 C (81.0 F)
1945
29.4 C (84.9 F)
1946
27.8 C (82.0 F)
1947
30.0 C (86.0 F)
1948
30.0 C (86.0 F)
1949
30.0 C (86.0 F)
1950
28.3 C (82.9 F)
1951
30.6 C (87.1 F)
1952
29.4 C (84.9 F)
1953
30.0 C (86.0 F)
1954
28.3 C (82.9 F)
1955
35.6 C (96.1 F)
1956
31.7 C (89.1 F)
1957
28.3 C (82.9 F)
1958
26.7 C (80.1 F)
1959
27.8 C (82.0 F)
1960
27.2 C (81.0 F)
1961
30.0 C (86.0 F)
1962
28.9 C (84.0 F)
1963
30.6 C (87.1 F)
1964
30.0 C (86.0 F)
1965
30.0 C (86.0 F)
1966
28.9 C (84.0 F)
1967
30.6 C (87.1 F)
1968
26.7 C (80.1 F)
1969
32.8 C (91.0 F)
1970
28.9 C (84.0 F)
1971
31.1 C (88.0 F)
1972
30.0 C (86.0 F)
1973
29.4 C (84.9 F)
1974
31.1 C (88.0 F)
1975
32.2 C (90.0 F)
1976
30.6 C (87.1 F)
1977
28.5 C (83.3 F)
1978
28.3 C (82.9 F)
1979
32.0 C (89.6 F)
1980
28.7 C (83.7 F)
1981
32.4 C (90.3 F)
1982
29.1 C (84.4 F)
1983
32.4 C (90.3 F)
Coldest night (TNn)
The coldest night of the year at Big Trout Lake, 1939 to 1983. The record is -47.8 C (-54.0 F) in 1951, marked on the chart; the median year is -42.8 C (-45.0 F).
Coldest night (TNn) at Big Trout Lake by year
Year
Coldest night (TNn)
1939
-42.2 C (-44.0 F)
1940
-38.3 C (-36.9 F)
1941
-40.6 C (-41.1 F)
1942
-45.6 C (-50.1 F)
1943
-43.9 C (-47.0 F)
1944
-42.2 C (-44.0 F)
1945
-40.6 C (-41.1 F)
1946
-43.9 C (-47.0 F)
1947
-41.7 C (-43.1 F)
1948
-43.3 C (-45.9 F)
1949
-41.7 C (-43.1 F)
1950
-45.0 C (-49.0 F)
1951
-47.8 C (-54.0 F)
1952
-42.2 C (-44.0 F)
1953
-44.4 C (-47.9 F)
1954
-46.7 C (-52.1 F)
1955
-44.4 C (-47.9 F)
1956
-38.9 C (-38.0 F)
1957
-43.9 C (-47.0 F)
1958
-42.8 C (-45.0 F)
1959
-42.8 C (-45.0 F)
1960
-44.4 C (-47.9 F)
1961
-41.1 C (-42.0 F)
1962
-44.4 C (-47.9 F)
1963
-45.0 C (-49.0 F)
1964
-40.0 C (-40.0 F)
1965
-44.4 C (-47.9 F)
1966
-42.8 C (-45.0 F)
1967
-46.1 C (-51.0 F)
1968
-43.9 C (-47.0 F)
1969
-35.6 C (-32.1 F)
1970
-43.9 C (-47.0 F)
1971
-37.2 C (-35.0 F)
1972
-41.7 C (-43.1 F)
1973
-44.4 C (-47.9 F)
1974
-44.4 C (-47.9 F)
1975
-44.4 C (-47.9 F)
1976
-41.1 C (-42.0 F)
1977
-40.9 C (-41.6 F)
1978
-38.8 C (-37.8 F)
1979
-42.8 C (-45.0 F)
1980
-39.1 C (-38.4 F)
1981
-43.1 C (-45.6 F)
1982
-43.7 C (-46.7 F)
1983
-40.1 C (-40.2 F)
Wettest day (Rx1day)
The wettest day of the year at Big Trout Lake, 1939 to 1983. The record is 84.1 mm (3.3 in) in 1955, marked on the chart; the median year is 33.8 mm (1.3 in).
Wettest day (Rx1day) at Big Trout Lake by year
Year
Wettest day (Rx1day)
1939
34.8 mm (1.4 in)
1940
75.2 mm (3.0 in)
1941
41.9 mm (1.6 in)
1942
33.0 mm (1.3 in)
1943
64.0 mm (2.5 in)
1944
23.6 mm (0.9 in)
1945
29.5 mm (1.2 in)
1946
35.1 mm (1.4 in)
1947
68.1 mm (2.7 in)
1948
56.9 mm (2.2 in)
1949
65.5 mm (2.6 in)
1950
32.8 mm (1.3 in)
1951
31.5 mm (1.2 in)
1952
75.2 mm (3.0 in)
1953
32.3 mm (1.3 in)
1954
26.4 mm (1.0 in)
1955
84.1 mm (3.3 in)
1956
33.3 mm (1.3 in)
1957
30.7 mm (1.2 in)
1958
19.1 mm (0.8 in)
1959
40.1 mm (1.6 in)
1960
27.7 mm (1.1 in)
1961
37.3 mm (1.5 in)
1962
22.1 mm (0.9 in)
1963
24.4 mm (1.0 in)
1964
34.5 mm (1.4 in)
1965
29.0 mm (1.1 in)
1966
37.6 mm (1.5 in)
1967
28.7 mm (1.1 in)
1968
29.7 mm (1.2 in)
1969
28.2 mm (1.1 in)
1970
40.1 mm (1.6 in)
1971
34.3 mm (1.4 in)
1972
30.5 mm (1.2 in)
1973
83.8 mm (3.3 in)
1974
33.8 mm (1.3 in)
1975
65.3 mm (2.6 in)
1976
24.4 mm (1.0 in)
1977
27.2 mm (1.1 in)
1978
28.2 mm (1.1 in)
1979
45.8 mm (1.8 in)
1980
30.7 mm (1.2 in)
1981
37.8 mm (1.5 in)
1982
70.5 mm (2.8 in)
1983
60.9 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Big Trout Lake, 1939 to 1983. The record is 104.4 mm (4.1 in) in 1949, marked on the chart; the median year is 60.9 mm (2.4 in).
Wettest five days (Rx5day) at Big Trout Lake by year
Year
Wettest five days (Rx5day)
1939
49.5 mm (1.9 in)
1940
84.3 mm (3.3 in)
1941
78.2 mm (3.1 in)
1942
60.9 mm (2.4 in)
1943
99.1 mm (3.9 in)
1944
52.1 mm (2.1 in)
1945
66.7 mm (2.6 in)
1946
45.7 mm (1.8 in)
1947
86.1 mm (3.4 in)
1948
79.5 mm (3.1 in)
1949
104.4 mm (4.1 in)
1950
60.8 mm (2.4 in)
1951
56.8 mm (2.2 in)
1952
78.5 mm (3.1 in)
1953
55.7 mm (2.2 in)
1954
35.3 mm (1.4 in)
1955
89.2 mm (3.5 in)
1956
51.6 mm (2.0 in)
1957
61.2 mm (2.4 in)
1958
29.8 mm (1.2 in)
1959
53.1 mm (2.1 in)
1960
31.5 mm (1.2 in)
1961
63.3 mm (2.5 in)
1962
41.7 mm (1.6 in)
1963
37.3 mm (1.5 in)
1964
56.2 mm (2.2 in)
1965
58.0 mm (2.3 in)
1966
63.3 mm (2.5 in)
1967
35.5 mm (1.4 in)
1968
38.1 mm (1.5 in)
1969
61.0 mm (2.4 in)
1970
49.5 mm (1.9 in)
1971
73.9 mm (2.9 in)
1972
44.0 mm (1.7 in)
1973
102.1 mm (4.0 in)
1974
61.3 mm (2.4 in)
1975
74.7 mm (2.9 in)
1976
45.0 mm (1.8 in)
1977
72.4 mm (2.9 in)
1978
45.0 mm (1.8 in)
1979
68.5 mm (2.7 in)
1980
60.2 mm (2.4 in)
1981
68.5 mm (2.7 in)
1982
87.0 mm (3.4 in)
1983
101.6 mm (4.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Big Trout Lake, 1939 to 1983. The record is 45 days in 1939, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Big Trout Lake by year
Year
Longest dry spell (CDD)
1939
45 days
1940
25 days
1941
22 days
1942
17 days
1943
17 days
1944
25 days
1945
25 days
1946
12 days
1947
15 days
1948
45 days
1949
26 days
1950
23 days
1951
23 days
1952
13 days
1953
17 days
1954
21 days
1955
15 days
1956
24 days
1957
26 days
1958
25 days
1959
18 days
1960
43 days
1961
30 days
1962
21 days
1963
18 days
1964
22 days
1965
18 days
1966
16 days
1967
17 days
1968
24 days
1969
18 days
1970
26 days
1971
26 days
1972
25 days
1973
16 days
1974
17 days
1975
38 days
1976
17 days
1977
18 days
1978
21 days
1979
28 days
1980
18 days
1981
22 days
1982
17 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Big Trout Lake falls on 9 June and the median first autumn frost on 18 September, which leaves a median of 104 days between them.
Fitted over all years, the growing season changes by +0.8 days per decade at this station.
Frost dates and growing season at Big Trout Lake
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
9 June
n/a
8 June
n/a
-1.3 days per decade
First autumn frost
18 September
n/a
16 September
n/a
-0.5 days per decade
Growing days
104 days
n/a
106 days
n/a
+0.8 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
44 years, 1940 to 1983
A day with at least 35.9 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 119.5 mm (4.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Big Trout Lake: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
35.9 mm (1.4 in)
5 years
50.8 mm (2.0 in)
10 years
63.1 mm (2.5 in)
25 years
82.2 mm (3.2 in)
50 years
99.4 mm (3.9 in)
Longer than the 44 years of record
100 years
119.5 mm (4.7 in)
Longer than the 44 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, 44 years of values from 1940 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: 84.1 mm (3.3 in) in 1955; 83.8 mm (3.3 in) in 1973; 75.2 mm (3.0 in) in 1940.
Download the Data
Data for Big Trout Lake standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Big Trout Lake 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.