Record envelope, standing records and threshold days for Yellowknife A (CA002204100), Northwest Territories, Canada, with 72 years of record.
Key Facts for Yellowknife A
Yellowknife A (CA002204100) is a weather station in Northwest Territories, Canada at 62.47 latitude and -114.43 longitude, 206 m (676 ft) above sea level.
The station reports from 1942 to 2013, 72 years of record.
1,464 records set at Yellowknife A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Yellowknife A set a daily record high maximum temperature of -4.8 C (23.4 F) on 25 December 1983.
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Yellowknife A. 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 Yellowknife A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
2.8 C (37.0 F)
-51.2 C (-60.2 F)
n/a
n/a
Feb
6.1 C (43.0 F)
-51.2 C (-60.2 F)
n/a
n/a
Mar
8.9 C (48.0 F)
-43.3 C (-45.9 F)
n/a
n/a
Apr
20.3 C (68.5 F)
-40.6 C (-41.1 F)
n/a
n/a
May
26.1 C (79.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Jun
30.0 C (86.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
32.2 C (90.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
30.2 C (86.4 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
26.1 C (79.0 F)
-9.7 C (14.5 F)
n/a
n/a
Oct
18.3 C (64.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Nov
7.8 C (46.0 F)
-44.4 C (-47.9 F)
n/a
n/a
Dec
2.8 C (37.0 F)
-48.3 C (-54.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Yellowknife A still stand. 1981 holds the most, with 55.
Standing records at Yellowknife A by the year they were set
Year set
Standing records
1942
8
1943
44
1944
37
1945
18
1946
38
1947
40
1948
46
1949
29
1950
36
1951
48
1952
38
1953
28
1954
48
1955
42
1956
44
1957
39
1958
18
1959
49
1960
19
1961
49
1962
26
1963
27
1964
35
1965
39
1966
47
1967
42
1968
32
1969
34
1970
22
1971
34
1972
34
1973
21
1974
35
1975
31
1976
27
1977
40
1978
11
1979
46
1980
39
1981
55
1982
36
1983
33
All-Time Record Progression
3 new records
3 all-time records were set at Yellowknife A between 15 August 1973 and 20 February 1982. Each dot is a new record.
When Yellowknife A set new all-time records
Date
Kind
Detail
1973-08-15
Record daily precipitation
Record daily precipitation 82.8 mm (3.3 in)
1975-10-29
Record daily snowfall
Record daily snowfall 16.0 cm (6.3 in)
1982-02-20
Record daily snowfall
Record daily snowfall 23.7 cm (9.3 in)
Wettest Day of Each Month
Aug: 82.8 mm (3.3 in)
The wettest day on record for each calendar month at Yellowknife A. The most was 82.8 mm (3.3 in) on 15 August 1973.
Record daily precipitation for each month at Yellowknife A
Month
Record daily precipitation (mm)
Date
Jan
12.4 mm (0.5 in)
3 January 1946
Feb
17.5 mm (0.7 in)
20 February 1982
Mar
10.9 mm (0.4 in)
14 March 1954
Apr
13.5 mm (0.5 in)
5 April 1966
May
34.0 mm (1.3 in)
5 May 1957
Jun
20.1 mm (0.8 in)
30 June 1944
Jul
41.1 mm (1.6 in)
22 July 1961
Aug
82.8 mm (3.3 in)
15 August 1973
Sep
29.7 mm (1.2 in)
7 September 1982
Oct
35.6 mm (1.4 in)
11 October 1967
Nov
12.2 mm (0.5 in)
22 November 1942
Dec
11.4 mm (0.4 in)
31 December 1958
Period of Record Coverage
1942 to 1983
Complete yearUnder 90 percent of days
42 years of record at Yellowknife A, 1942 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1942.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Yellowknife A, 1943 to 1983. Blue stripes are years cooler than the station's own mean of -5.4 C (22.4 F); red stripes are warmer. The coolest year was 1982, at -7.2 C (19.0 F), and the warmest was 1981, at -2.5 C (27.5 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Yellowknife A as warming stripes, 1943 to 1983
Year
Annual mean temperature
Difference from the station mean
1943
-4.0 C
+1.30 C
1944
-3.3 C
+2.07 C
1945
-5.6 C
-0.29 C
1946
-6.2 C
-0.89 C
1947
-6.2 C
-0.89 C
1948
-5.7 C
-0.39 C
1949
-5.7 C
-0.31 C
1950
-6.8 C
-1.44 C
1951
-6.5 C
-1.20 C
1952
-4.2 C
+1.14 C
1953
-3.6 C
+1.79 C
1954
-5.1 C
+0.24 C
1955
-6.1 C
-0.77 C
1956
-6.1 C
-0.71 C
1957
-5.6 C
-0.26 C
1958
-4.8 C
+0.58 C
1959
-6.4 C
-1.07 C
1960
-5.2 C
+0.10 C
1961
-6.6 C
-1.26 C
1962
-5.8 C
-0.48 C
1963
-5.0 C
+0.31 C
1964
-6.0 C
-0.64 C
1965
-6.2 C
-0.82 C
1966
-7.0 C
-1.67 C
1967
-5.9 C
-0.60 C
1968
-5.6 C
-0.25 C
1969
-4.8 C
+0.51 C
1970
-5.1 C
+0.28 C
1971
-4.8 C
+0.54 C
1972
-7.0 C
-1.67 C
1973
-3.7 C
+1.60 C
1974
-6.2 C
-0.87 C
1975
-5.2 C
+0.13 C
1976
-3.8 C
+1.54 C
1977
-3.9 C
+1.49 C
1978
-5.2 C
+0.12 C
1979
-5.3 C
+0.04 C
1980
-3.9 C
+1.44 C
1981
-2.5 C
+2.87 C
1982
-7.2 C
-1.86 C
1983
-5.1 C
+0.23 C
The fitted trend in annual mean temperature here over 1943 to 1983 is 0.1 C (-0.2 to 0.4) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.3 to 0.8) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Yellowknife A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.2 to 0.4) per decade
0.2 F (-0.3 to 0.8) per decade
1943 to 1983
41
Not clearly different from zero
Mean daily maximum
0.1 C (-0.2 to 0.4) per decade
0.2 F (-0.3 to 0.7) per decade
1943 to 1983
41
Not clearly different from zero
Mean daily minimum
0.2 C (-0.1 to 0.5) per decade
0.3 F (-0.3 to 0.9) per decade
1943 to 1983
41
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
1942 to 1983
Yearly extremes at Yellowknife A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
32.2 C (90.0 F)
1964
27.8 C (82.0 F)
42
Coldest night (TNn)
-51.2 C (-60.2 F)
1947
-45.3 C (-49.5 F)
42
Wettest day (Rx1day)
82.8 mm (3.3 in)
1973
20.0 mm (0.8 in)
42
Wettest five days (Rx5day)
111.5 mm (4.4 in)
1973
30.0 mm (1.2 in)
42
Longest dry spell (CDD)
74 days
1953
33 days
42
Hottest day (TXx)
The hottest day of the year at Yellowknife A, 1942 to 1983. The record is 32.2 C (90.0 F) in 1964, marked on the chart; the median year is 27.8 C (82.0 F).
Hottest day (TXx) at Yellowknife A by year
Year
Hottest day (TXx)
1942
25.0 C (77.0 F)
1943
27.8 C (82.0 F)
1944
27.8 C (82.0 F)
1945
30.0 C (86.0 F)
1946
27.8 C (82.0 F)
1947
30.0 C (86.0 F)
1948
27.8 C (82.0 F)
1949
26.7 C (80.1 F)
1950
28.9 C (84.0 F)
1951
30.0 C (86.0 F)
1952
25.0 C (77.0 F)
1953
29.4 C (84.9 F)
1954
28.3 C (82.9 F)
1955
29.4 C (84.9 F)
1956
27.8 C (82.0 F)
1957
26.7 C (80.1 F)
1958
26.1 C (79.0 F)
1959
29.4 C (84.9 F)
1960
27.2 C (81.0 F)
1961
31.1 C (88.0 F)
1962
28.9 C (84.0 F)
1963
26.7 C (80.1 F)
1964
32.2 C (90.0 F)
1965
27.2 C (81.0 F)
1966
27.8 C (82.0 F)
1967
27.8 C (82.0 F)
1968
25.6 C (78.1 F)
1969
26.7 C (80.1 F)
1970
27.8 C (82.0 F)
1971
28.3 C (82.9 F)
1972
28.3 C (82.9 F)
1973
28.9 C (84.0 F)
1974
27.2 C (81.0 F)
1975
31.1 C (88.0 F)
1976
28.9 C (84.0 F)
1977
25.8 C (78.4 F)
1978
25.9 C (78.6 F)
1979
30.2 C (86.4 F)
1980
26.1 C (79.0 F)
1981
28.6 C (83.5 F)
1982
28.5 C (83.3 F)
1983
28.0 C (82.4 F)
Coldest night (TNn)
The coldest night of the year at Yellowknife A, 1942 to 1983. The record is -51.2 C (-60.2 F) in 1947, marked on the chart; the median year is -45.3 C (-49.5 F).
Coldest night (TNn) at Yellowknife A by year
Year
Coldest night (TNn)
1942
-40.6 C (-41.1 F)
1943
-46.1 C (-51.0 F)
1944
-42.2 C (-44.0 F)
1945
-41.7 C (-43.1 F)
1946
-48.3 C (-54.9 F)
1947
-51.2 C (-60.2 F)
1948
-46.7 C (-52.1 F)
1949
-45.0 C (-49.0 F)
1950
-45.6 C (-50.1 F)
1951
-45.0 C (-49.0 F)
1952
-46.7 C (-52.1 F)
1953
-47.2 C (-53.0 F)
1954
-48.3 C (-54.9 F)
1955
-43.3 C (-45.9 F)
1956
-45.0 C (-49.0 F)
1957
-46.7 C (-52.1 F)
1958
-45.0 C (-49.0 F)
1959
-43.3 C (-45.9 F)
1960
-48.9 C (-56.0 F)
1961
-44.4 C (-47.9 F)
1962
-46.1 C (-51.0 F)
1963
-46.7 C (-52.1 F)
1964
-42.8 C (-45.0 F)
1965
-44.4 C (-47.9 F)
1966
-47.2 C (-53.0 F)
1967
-46.1 C (-51.0 F)
1968
-45.0 C (-49.0 F)
1969
-45.6 C (-50.1 F)
1970
-46.1 C (-51.0 F)
1971
-47.8 C (-54.0 F)
1972
-44.4 C (-47.9 F)
1973
-42.2 C (-44.0 F)
1974
-47.8 C (-54.0 F)
1975
-45.6 C (-50.1 F)
1976
-43.3 C (-45.9 F)
1977
-44.5 C (-48.1 F)
1978
-42.2 C (-44.0 F)
1979
-46.8 C (-52.2 F)
1980
-42.4 C (-44.3 F)
1981
-41.7 C (-43.1 F)
1982
-47.7 C (-53.9 F)
1983
-43.3 C (-45.9 F)
Wettest day (Rx1day)
The wettest day of the year at Yellowknife A, 1942 to 1983. The record is 82.8 mm (3.3 in) in 1973, marked on the chart; the median year is 20.0 mm (0.8 in).
Wettest day (Rx1day) at Yellowknife A by year
Year
Wettest day (Rx1day)
1942
21.6 mm (0.9 in)
1943
14.2 mm (0.6 in)
1944
31.5 mm (1.2 in)
1945
19.6 mm (0.8 in)
1946
15.5 mm (0.6 in)
1947
15.7 mm (0.6 in)
1948
28.2 mm (1.1 in)
1949
14.5 mm (0.6 in)
1950
12.2 mm (0.5 in)
1951
14.2 mm (0.6 in)
1952
18.3 mm (0.7 in)
1953
21.6 mm (0.9 in)
1954
26.4 mm (1.0 in)
1955
23.4 mm (0.9 in)
1956
14.7 mm (0.6 in)
1957
34.0 mm (1.3 in)
1958
38.6 mm (1.5 in)
1959
18.8 mm (0.7 in)
1960
21.6 mm (0.9 in)
1961
41.1 mm (1.6 in)
1962
18.8 mm (0.7 in)
1963
20.3 mm (0.8 in)
1964
19.8 mm (0.8 in)
1965
13.5 mm (0.5 in)
1966
13.7 mm (0.5 in)
1967
35.6 mm (1.4 in)
1968
22.9 mm (0.9 in)
1969
45.2 mm (1.8 in)
1970
24.6 mm (1.0 in)
1971
17.5 mm (0.7 in)
1972
18.3 mm (0.7 in)
1973
82.8 mm (3.3 in)
1974
21.8 mm (0.9 in)
1975
32.3 mm (1.3 in)
1976
23.1 mm (0.9 in)
1977
16.0 mm (0.6 in)
1978
20.2 mm (0.8 in)
1979
14.2 mm (0.6 in)
1980
16.8 mm (0.7 in)
1981
16.2 mm (0.6 in)
1982
29.7 mm (1.2 in)
1983
17.6 mm (0.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Yellowknife A, 1942 to 1983. The record is 111.5 mm (4.4 in) in 1973, marked on the chart; the median year is 30.0 mm (1.2 in).
Wettest five days (Rx5day) at Yellowknife A by year
Year
Wettest five days (Rx5day)
1942
26.0 mm (1.0 in)
1943
25.5 mm (1.0 in)
1944
32.3 mm (1.3 in)
1945
26.0 mm (1.0 in)
1946
23.8 mm (0.9 in)
1947
18.3 mm (0.7 in)
1948
35.1 mm (1.4 in)
1949
17.8 mm (0.7 in)
1950
21.1 mm (0.8 in)
1951
20.1 mm (0.8 in)
1952
28.8 mm (1.1 in)
1953
47.2 mm (1.9 in)
1954
33.0 mm (1.3 in)
1955
31.8 mm (1.3 in)
1956
30.9 mm (1.2 in)
1957
38.4 mm (1.5 in)
1958
47.5 mm (1.9 in)
1959
46.2 mm (1.8 in)
1960
28.7 mm (1.1 in)
1961
42.6 mm (1.7 in)
1962
20.5 mm (0.8 in)
1963
25.1 mm (1.0 in)
1964
28.4 mm (1.1 in)
1965
26.0 mm (1.0 in)
1966
21.8 mm (0.9 in)
1967
50.6 mm (2.0 in)
1968
50.3 mm (2.0 in)
1969
76.9 mm (3.0 in)
1970
46.5 mm (1.8 in)
1971
29.9 mm (1.2 in)
1972
28.5 mm (1.1 in)
1973
111.5 mm (4.4 in)
1974
35.9 mm (1.4 in)
1975
42.8 mm (1.7 in)
1976
39.6 mm (1.6 in)
1977
22.2 mm (0.9 in)
1978
39.4 mm (1.6 in)
1979
25.0 mm (1.0 in)
1980
30.0 mm (1.2 in)
1981
27.6 mm (1.1 in)
1982
53.5 mm (2.1 in)
1983
27.0 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Yellowknife A, 1942 to 1983. The record is 74 days in 1953, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Yellowknife A by year
Year
Longest dry spell (CDD)
1942
20 days
1943
26 days
1944
72 days
1945
33 days
1946
33 days
1947
38 days
1948
71 days
1949
38 days
1950
61 days
1951
35 days
1952
27 days
1953
74 days
1954
35 days
1955
25 days
1956
37 days
1957
33 days
1958
48 days
1959
28 days
1960
36 days
1961
53 days
1962
26 days
1963
29 days
1964
28 days
1965
47 days
1966
38 days
1967
23 days
1968
33 days
1969
28 days
1970
37 days
1971
31 days
1972
43 days
1973
31 days
1974
21 days
1975
24 days
1976
18 days
1977
31 days
1978
29 days
1979
44 days
1980
28 days
1981
31 days
1982
35 days
1983
31 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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Yellowknife A falls on 29 May and the median first autumn frost on 16 September, which leaves a median of 113 days between them.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
Frost dates and growing season at Yellowknife A
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
29 May
n/a
28 May
n/a
-2.6 days per decade
First autumn frost
16 September
n/a
15 September
n/a
-1.5 days per decade
Growing days
113 days
n/a
112 days
n/a
+1.2 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
41 years, 1943 to 1983
A day with at least 19.8 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 77.9 mm (3.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Yellowknife A: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
19.8 mm (0.8 in)
5 years
28.1 mm (1.1 in)
10 years
35.8 mm (1.4 in)
25 years
48.7 mm (1.9 in)
50 years
61.6 mm (2.4 in)
Longer than the 41 years of record
100 years
77.9 mm (3.1 in)
Longer than the 41 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, 41 years of values from 1943 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: 82.8 mm (3.3 in) in 1973; 45.2 mm (1.8 in) in 1969; 41.1 mm (1.6 in) in 1961.
Download the Data
Data for Yellowknife A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Yellowknife A 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.