Record envelope, standing records and threshold days for Hay River A (CA002202400), Northwest Territories, Canada, with 83 years of record.
Key Facts for Hay River A
Hay River A (CA002202400) is a weather station in Northwest Territories, Canada at 60.83 latitude and -115.78 longitude, 165 m (541 ft) above sea level.
The station reports from 1943 to 2025, 83 years of record.
1,464 records set at Hay River A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Hay River A set a daily record high minimum temperature of -4.4 C (24.1 F) on 20 November 1983.
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Hay River 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 Hay River A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
7.7 C (45.9 F)
-47.8 C (-54.0 F)
n/a
n/a
Feb
13.9 C (57.0 F)
-48.3 C (-54.9 F)
n/a
n/a
Mar
15.6 C (60.1 F)
-44.4 C (-47.9 F)
n/a
n/a
Apr
23.8 C (74.8 F)
-38.9 C (-38.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-18.9 C (-2.0 F)
n/a
n/a
Jun
33.3 C (91.9 F)
-5.6 C (21.9 F)
n/a
n/a
Jul
35.0 C (95.0 F)
1.6 C (34.9 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
30.0 C (86.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
24.4 C (75.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Nov
15.0 C (59.0 F)
-39.4 C (-38.9 F)
n/a
n/a
Dec
12.2 C (54.0 F)
-47.2 C (-53.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hay River A still stand. 1981 holds the most, with 65.
Standing records at Hay River A by the year they were set
Year set
Standing records
1943
11
1944
43
1945
48
1946
35
1947
58
1948
41
1949
37
1950
38
1951
53
1952
44
1953
35
1954
42
1955
50
1956
49
1957
29
1958
15
1959
39
1960
25
1961
56
1962
27
1963
35
1964
24
1965
37
1966
62
1967
26
1968
30
1969
25
1970
29
1971
35
1972
30
1973
25
1974
24
1975
45
1976
16
1977
28
1978
17
1979
46
1980
35
1981
65
1982
30
1983
25
All-Time Record Progression
4 new records
4 all-time records were set at Hay River A between 3 July 1975 and 9 August 1981. Each dot is a new record.
When Hay River A set new all-time records
Date
Kind
Detail
1975-07-03
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
1975-12-11
Record low maximum temperature
Record low maximum temperature -39.4 C (-38.9 F)
1975-12-12
Record low maximum temperature
Record low maximum temperature -41.7 C (-43.1 F)
1981-08-09
Record high maximum temperature
Record high maximum temperature 36.7 C (98.1 F)
Wettest Day of Each Month
Sep: 50.8 mm (2.0 in)
The wettest day on record for each calendar month at Hay River A. The most was 50.8 mm (2.0 in) on 4 September 1964.
Record daily precipitation for each month at Hay River A
Month
Record daily precipitation (mm)
Date
Jan
15.0 mm (0.6 in)
8 January 1961
Feb
13.7 mm (0.5 in)
19 February 1958
Mar
14.5 mm (0.6 in)
6 March 1968
Apr
28.4 mm (1.1 in)
25 April 1970
May
31.4 mm (1.2 in)
27 May 1979
Jun
43.9 mm (1.7 in)
1 June 1976
Jul
46.2 mm (1.8 in)
13 July 1959
Aug
38.1 mm (1.5 in)
22 August 1960
Sep
50.8 mm (2.0 in)
4 September 1964
Oct
36.8 mm (1.4 in)
9 October 1961
Nov
35.1 mm (1.4 in)
15 November 1963
Dec
20.8 mm (0.8 in)
24 December 1965
Period of Record Coverage
1943 to 1983
Complete yearUnder 90 percent of days
41 years of record at Hay River A, 1943 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1943.
Cooler than the station meanWarmer than the station mean
One stripe for each of 36 complete years at Hay River A, 1947 to 1983. Blue stripes are years cooler than the station's own mean of -3.7 C (25.4 F); red stripes are warmer. The coolest year was 1966, at -5.1 C (22.7 F), and the warmest was 1981, at -0.8 C (30.5 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Hay River A as warming stripes, 1947 to 1983
Year
Annual mean temperature
Difference from the station mean
1947
-4.3 C
-0.63 C
1948
-3.7 C
-0.05 C
1949
-3.1 C
+0.50 C
1950
-5.1 C
-1.43 C
1951
-5.0 C
-1.31 C
1952
-2.1 C
+1.54 C
1953
-2.1 C
+1.56 C
1954
-3.5 C
+0.19 C
1955
-4.6 C
-1.00 C
1956
-4.2 C
-0.60 C
1957
-3.8 C
-0.11 C
1958
-2.8 C
+0.82 C
1959
-4.4 C
-0.73 C
1960
-3.7 C
-0.09 C
1961
-4.9 C
-1.28 C
1962
-4.2 C
-0.54 C
1963
-3.0 C
+0.62 C
1964
-4.2 C
-0.55 C
1965
-4.0 C
-0.32 C
1966
-5.1 C
-1.50 C
1967
-3.9 C
-0.23 C
1968
-4.1 C
-0.43 C
1969
-3.2 C
+0.45 C
1970
-3.4 C
+0.21 C
1971
-3.2 C
+0.46 C
1972
-5.1 C
-1.41 C
1973
-2.7 C
+0.95 C
1974
-4.5 C
-0.83 C
1975
-3.8 C
-0.14 C
1976
-2.0 C
+1.62 C
1977
-2.4 C
+1.28 C
1978
-3.4 C
+0.23 C
1980
-1.9 C
+1.77 C
1981
-0.8 C
+2.83 C
1982
-5.1 C
-1.50 C
1983
-4.1 C
-0.50 C
The fitted trend in annual mean temperature here over 1947 to 1983 is 0.2 C (-0.1 to 0.6) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.4 F (-0.2 to 1.0) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hay River A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (-0.1 to 0.6) per decade
0.4 F (-0.2 to 1.0) per decade
1947 to 1983
36
Not clearly different from zero
Mean daily maximum
0.30 C (-0.04 to 0.64) per decade
0.5 F (-0.1 to 1.2) per decade
1947 to 1983
36
Not clearly different from zero
Mean daily minimum
0.1 C (-0.2 to 0.5) per decade
0.3 F (-0.4 to 0.9) per decade
1947 to 1983
36
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
1943 to 1983
Yearly extremes at Hay River A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1981
31.1 C (88.0 F)
41
Coldest night (TNn)
-48.3 C (-54.9 F)
1947
-44.4 C (-47.9 F)
41
Wettest day (Rx1day)
50.8 mm (2.0 in)
1964
25.9 mm (1.0 in)
41
Wettest five days (Rx5day)
91.9 mm (3.6 in)
1964
38.4 mm (1.5 in)
41
Longest dry spell (CDD)
76 days
1980
32 days
41
Hottest day (TXx)
The hottest day of the year at Hay River A, 1943 to 1983. The record is 36.7 C (98.1 F) in 1981, marked on the chart; the median year is 31.1 C (88.0 F).
Hottest day (TXx) at Hay River A by year
Year
Hottest day (TXx)
1943
22.8 C (73.0 F)
1944
29.4 C (84.9 F)
1945
33.9 C (93.0 F)
1946
30.6 C (87.1 F)
1947
30.6 C (87.1 F)
1948
33.3 C (91.9 F)
1949
28.9 C (84.0 F)
1950
32.2 C (90.0 F)
1951
30.6 C (87.1 F)
1952
32.2 C (90.0 F)
1953
33.3 C (91.9 F)
1954
27.8 C (82.0 F)
1955
32.8 C (91.0 F)
1956
30.0 C (86.0 F)
1957
28.9 C (84.0 F)
1958
31.1 C (88.0 F)
1959
32.2 C (90.0 F)
1960
29.4 C (84.9 F)
1961
31.1 C (88.0 F)
1962
27.2 C (81.0 F)
1963
30.0 C (86.0 F)
1964
32.2 C (90.0 F)
1965
31.1 C (88.0 F)
1966
30.0 C (86.0 F)
1967
33.3 C (91.9 F)
1968
29.4 C (84.9 F)
1969
30.0 C (86.0 F)
1970
33.9 C (93.0 F)
1971
35.6 C (96.1 F)
1972
31.7 C (89.1 F)
1973
33.9 C (93.0 F)
1974
30.0 C (86.0 F)
1975
35.0 C (95.0 F)
1976
29.4 C (84.9 F)
1977
27.4 C (81.3 F)
1978
26.6 C (79.9 F)
1979
32.2 C (90.0 F)
1980
32.5 C (90.5 F)
1981
36.7 C (98.1 F)
1982
31.8 C (89.2 F)
1983
29.5 C (85.1 F)
Coldest night (TNn)
The coldest night of the year at Hay River A, 1943 to 1983. The record is -48.3 C (-54.9 F) in 1947, marked on the chart; the median year is -44.4 C (-47.9 F).
Coldest night (TNn) at Hay River A by year
Year
Coldest night (TNn)
1943
-35.0 C (-31.0 F)
1944
-42.2 C (-44.0 F)
1945
-44.4 C (-47.9 F)
1946
-47.2 C (-53.0 F)
1947
-48.3 C (-54.9 F)
1948
-44.4 C (-47.9 F)
1949
-43.3 C (-45.9 F)
1950
-45.0 C (-49.0 F)
1951
-43.3 C (-45.9 F)
1952
-42.2 C (-44.0 F)
1953
-45.0 C (-49.0 F)
1954
-46.7 C (-52.1 F)
1955
-43.3 C (-45.9 F)
1956
-43.9 C (-47.0 F)
1957
-43.3 C (-45.9 F)
1958
-41.1 C (-42.0 F)
1959
-44.4 C (-47.9 F)
1960
-47.2 C (-53.0 F)
1961
-45.0 C (-49.0 F)
1962
-47.8 C (-54.0 F)
1963
-45.0 C (-49.0 F)
1964
-42.8 C (-45.0 F)
1965
-44.4 C (-47.9 F)
1966
-46.7 C (-52.1 F)
1967
-44.4 C (-47.9 F)
1968
-48.3 C (-54.9 F)
1969
-47.2 C (-53.0 F)
1970
-45.6 C (-50.1 F)
1971
-46.1 C (-51.0 F)
1972
-45.0 C (-49.0 F)
1973
-45.0 C (-49.0 F)
1974
-45.6 C (-50.1 F)
1975
-46.7 C (-52.1 F)
1976
-41.1 C (-42.0 F)
1977
-40.4 C (-40.7 F)
1978
-39.7 C (-39.5 F)
1979
-46.8 C (-52.2 F)
1980
-39.1 C (-38.4 F)
1981
-40.5 C (-40.9 F)
1982
-44.5 C (-48.1 F)
1983
-41.3 C (-42.3 F)
Wettest day (Rx1day)
The wettest day of the year at Hay River A, 1943 to 1983. The record is 50.8 mm (2.0 in) in 1964, marked on the chart; the median year is 25.9 mm (1.0 in).
Wettest day (Rx1day) at Hay River A by year
Year
Wettest day (Rx1day)
1943
17.8 mm (0.7 in)
1944
15.5 mm (0.6 in)
1945
23.1 mm (0.9 in)
1946
18.3 mm (0.7 in)
1947
14.0 mm (0.6 in)
1948
27.7 mm (1.1 in)
1949
20.3 mm (0.8 in)
1950
13.5 mm (0.5 in)
1951
29.5 mm (1.2 in)
1952
29.0 mm (1.1 in)
1953
20.3 mm (0.8 in)
1954
25.9 mm (1.0 in)
1955
29.0 mm (1.1 in)
1956
21.8 mm (0.9 in)
1957
21.6 mm (0.9 in)
1958
24.6 mm (1.0 in)
1959
46.2 mm (1.8 in)
1960
38.1 mm (1.5 in)
1961
36.8 mm (1.4 in)
1962
42.2 mm (1.7 in)
1963
35.1 mm (1.4 in)
1964
50.8 mm (2.0 in)
1965
20.8 mm (0.8 in)
1966
33.0 mm (1.3 in)
1967
26.7 mm (1.1 in)
1968
31.0 mm (1.2 in)
1969
24.6 mm (1.0 in)
1970
28.4 mm (1.1 in)
1971
19.3 mm (0.8 in)
1972
13.0 mm (0.5 in)
1973
26.9 mm (1.1 in)
1974
16.5 mm (0.6 in)
1975
35.3 mm (1.4 in)
1976
43.9 mm (1.7 in)
1977
10.6 mm (0.4 in)
1978
20.2 mm (0.8 in)
1979
31.4 mm (1.2 in)
1980
33.6 mm (1.3 in)
1981
26.6 mm (1.0 in)
1982
20.2 mm (0.8 in)
1983
20.2 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hay River A, 1943 to 1983. The record is 91.9 mm (3.6 in) in 1964, marked on the chart; the median year is 38.4 mm (1.5 in).
Wettest five days (Rx5day) at Hay River A by year
Year
Wettest five days (Rx5day)
1943
17.8 mm (0.7 in)
1944
22.9 mm (0.9 in)
1945
28.7 mm (1.1 in)
1946
24.7 mm (1.0 in)
1947
22.9 mm (0.9 in)
1948
56.8 mm (2.2 in)
1949
38.4 mm (1.5 in)
1950
34.6 mm (1.4 in)
1951
52.1 mm (2.1 in)
1952
34.1 mm (1.3 in)
1953
51.9 mm (2.0 in)
1954
53.5 mm (2.1 in)
1955
41.4 mm (1.6 in)
1956
33.5 mm (1.3 in)
1957
57.0 mm (2.2 in)
1958
31.5 mm (1.2 in)
1959
47.2 mm (1.9 in)
1960
47.6 mm (1.9 in)
1961
75.4 mm (3.0 in)
1962
49.6 mm (2.0 in)
1963
66.9 mm (2.6 in)
1964
91.9 mm (3.6 in)
1965
34.9 mm (1.4 in)
1966
36.6 mm (1.4 in)
1967
35.6 mm (1.4 in)
1968
53.1 mm (2.1 in)
1969
42.4 mm (1.7 in)
1970
40.9 mm (1.6 in)
1971
20.8 mm (0.8 in)
1972
36.3 mm (1.4 in)
1973
82.3 mm (3.2 in)
1974
35.6 mm (1.4 in)
1975
44.2 mm (1.7 in)
1976
57.0 mm (2.2 in)
1977
21.3 mm (0.8 in)
1978
39.4 mm (1.6 in)
1979
38.9 mm (1.5 in)
1980
38.0 mm (1.5 in)
1981
34.6 mm (1.4 in)
1982
30.0 mm (1.2 in)
1983
35.6 mm (1.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hay River A, 1943 to 1983. The record is 76 days in 1980, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Hay River A by year
Year
Longest dry spell (CDD)
1943
40 days
1944
52 days
1945
36 days
1946
45 days
1947
32 days
1948
64 days
1949
38 days
1950
44 days
1951
37 days
1952
24 days
1953
34 days
1954
33 days
1955
30 days
1956
20 days
1957
24 days
1958
24 days
1959
23 days
1960
26 days
1961
27 days
1962
25 days
1963
27 days
1964
26 days
1965
20 days
1966
22 days
1967
40 days
1968
41 days
1969
38 days
1970
20 days
1971
39 days
1972
22 days
1973
47 days
1974
20 days
1975
21 days
1976
25 days
1977
26 days
1978
37 days
1979
33 days
1980
76 days
1981
37 days
1982
34 days
1983
24 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
36 years with a frost
Across 36 years with a frost, the median last spring frost at Hay River A falls on 4 June and the median first autumn frost on 9 September, which leaves a median of 100 days between them.
Fitted over all years, the growing season changes by -1.4 days per decade at this station.
Frost dates and growing season at Hay River A
Measure
Median, all years
Earliest period
Recent period (1953 to 1983)
Recent against earliest
Fitted trend
Last spring frost
4 June
n/a
4 June
n/a
-0.1 days per decade
First autumn frost
9 September
n/a
9 September
n/a
-1.5 days per decade
Growing days
100 days
n/a
100 days
n/a
-1.4 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
40 years, 1944 to 1983
A day with at least 25.4 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 54.8 mm (2.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Hay River 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
25.4 mm (1.0 in)
5 years
34.1 mm (1.3 in)
10 years
39.5 mm (1.6 in)
25 years
46.0 mm (1.8 in)
50 years
50.5 mm (2.0 in)
Longer than the 40 years of record
100 years
54.8 mm (2.2 in)
Longer than the 40 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, 40 years of values from 1944 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: 50.8 mm (2.0 in) in 1964; 46.2 mm (1.8 in) in 1959; 43.9 mm (1.7 in) in 1976.
Download the Data
Data for Hay River A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hay River 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.