Hay River A Weather Records (CA002202400)
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.
About the Station
- Location: Northwest Territories, Canada, 60.83 latitude, -115.78 longitude.
- Elevation: 165 m (541 ft).
- Period of record: 1943 to 2025, 83 years.
- Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record| 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 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| 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)| 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| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1943 | 122 | 33% | No |
| 1944 | 336 | 92% | Yes |
| 1945 | 341 | 93% | Yes |
| 1946 | 339 | 93% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 358 | 98% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 352 | 96% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 364 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 20 November 1983 | Hay River A, CA | daily high min | -4.4 C (24.1 F) | 1.2 C (2.2 F) | 40 years | 17 of 100 (Routine) |
| 18 November 1983 | Hay River A, CA | daily high min | -2.6 C (27.3 F) | 2.3 C (4.1 F) | 4 years | 7 of 100 (Routine) |
| 17 October 1983 | Hay River A, CA | daily low min | -11.5 C (11.3 F) | 2.6 C (4.7 F) | 32 years | 18 of 100 (Routine) |
| 16 October 1983 | Hay River A, CA | daily low max | -5.0 C (23.0 F) | 2.2 C (4.0 F) | 32 years | 16 of 100 (Routine) |
| 29 September 1983 | Hay River A, CA | daily low min | -10.3 C (13.5 F) | 2.5 C (4.5 F) | 8 years | 12 of 100 (Routine) |
| 28 September 1983 | Hay River A, CA | daily low min | -9.3 C (15.3 F) | 3.2 C (5.8 F) | 21 years | 18 of 100 (Routine) |
| 27 September 1983 | Hay River A, CA | monthly snowfall | 12.2 cm (4.8 in) | 0.8 cm (0.3 in) | 32 years | 24 of 100 (Routine) |
| 22 September 1983 | Hay River A, CA | daily high max | 23.1 C (73.6 F) | 0.3 C (0.5 F) | 32 years | 13 of 100 (Routine) |
| 18 September 1983 | Hay River A, CA | daily low max | 4.2 C (39.6 F) | 1.9 C (3.4 F) | 10 years | 10 of 100 (Routine) |
| 17 September 1983 | Hay River A, CA | daily low max | 5.1 C (41.2 F) | 0.5 C (0.9 F) | 25 years | 11 of 100 (Routine) |
| 6 August 1983 | Hay River A, CA | daily rain | 13.2 mm (0.5 in) | 0.5 mm (0.02 in) | 36 years | 14 of 100 (Routine) |
| 4 August 1983 | Hay River A, CA | daily rain | 14.8 mm (0.6 in) | 10.7 mm (0.4 in) | 25 years | 20 of 100 (Routine) |
| 31 July 1983 | Hay River A, CA | daily high min | 16.0 C (60.8 F) | 0.9 C (1.6 F) | 1 year | 7 of 100 (Routine) |
| 7 July 1983 | Hay River A, CA | daily low min | 4.2 C (39.6 F) | 0.6 C (1.1 F) | 0 years | 6 of 100 (Routine) |
| 28 June 1983 | Hay River A, CA | daily high min | 15.9 C (60.6 F) | 1.5 C (2.7 F) | 28 years | 15 of 100 (Routine) |
| 21 June 1983 | Hay River A, CA | daily low min | 1.4 C (34.5 F) | 0.3 C (0.5 F) | 17 years | 9 of 100 (Routine) |
| 19 June 1983 | Hay River A, CA | daily low max | 8.8 C (47.8 F) | 1.2 C (2.2 F) | 24 years | 13 of 100 (Routine) |
| 16 June 1983 | Hay River A, CA | daily high min | 17.2 C (63.0 F) | 2.8 C (5.0 F) | 17 years | 16 of 100 (Routine) |
| 15 June 1983 | Hay River A, CA | daily high max | 29.5 C (85.1 F) | 1.7 C (3.1 F) | 13 years | 10 of 100 (Routine) |
| 9 June 1983 | Hay River A, CA | daily rain | 11.2 mm (0.4 in) | 2.6 mm (0.10 in) | 4 years | 10 of 100 (Routine) |
Climate Trend
36 complete years, 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.
| 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| 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)
| 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)
| 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)
| 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)
| 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)
| 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 frostAcross 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.
| 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 1983A 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.
| 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.
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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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-17).