Norman Wells A Weather Records (CA002202800)
Record envelope, standing records and threshold days for Norman Wells A (CA002202800), Northwest Territories, Canada, with 70 years of record.
Key Facts for Norman Wells A
- Norman Wells A (CA002202800) is a weather station in Northwest Territories, Canada at 65.28 latitude and -126.80 longitude, 73 m (240 ft) above sea level.
- The station reports from 1943 to 2012, 70 years of record.
- 1,464 records set at Norman Wells A still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Norman Wells A set a daily record high minimum temperature of -11.9 C (10.6 F) on 26 December 1983.
About the Station
- Location: Northwest Territories, Canada, 65.28 latitude, -126.80 longitude.
- Elevation: 73 m (240 ft).
- Period of record: 1943 to 2012, 70 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 | 11.8 C (53.2 F) | -52.2 C (-62.0 F) | n/a | n/a |
| Feb | 5.0 C (41.0 F) | -54.4 C (-65.9 F) | n/a | n/a |
| Mar | 11.1 C (52.0 F) | -46.1 C (-51.0 F) | n/a | n/a |
| Apr | 20.0 C (68.0 F) | -37.2 C (-35.0 F) | n/a | n/a |
| May | 31.1 C (88.0 F) | -17.8 C (0.0 F) | n/a | n/a |
| Jun | 32.8 C (91.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Jul | 33.9 C (93.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Aug | 31.7 C (89.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Sep | 26.7 C (80.1 F) | -15.7 C (3.7 F) | n/a | n/a |
| Oct | 20.0 C (68.0 F) | -31.7 C (-25.1 F) | n/a | n/a |
| Nov | 13.3 C (55.9 F) | -42.8 C (-45.0 F) | n/a | n/a |
| Dec | 1.7 C (35.1 F) | -47.8 C (-54.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1943 | 26 |
| 1944 | 52 |
| 1945 | 25 |
| 1946 | 28 |
| 1947 | 44 |
| 1948 | 49 |
| 1949 | 37 |
| 1950 | 35 |
| 1951 | 49 |
| 1952 | 29 |
| 1953 | 25 |
| 1954 | 46 |
| 1955 | 30 |
| 1956 | 48 |
| 1957 | 48 |
| 1958 | 9 |
| 1959 | 36 |
| 1960 | 20 |
| 1961 | 49 |
| 1962 | 31 |
| 1963 | 34 |
| 1964 | 36 |
| 1965 | 41 |
| 1966 | 39 |
| 1967 | 18 |
| 1968 | 22 |
| 1969 | 50 |
| 1970 | 36 |
| 1971 | 31 |
| 1972 | 29 |
| 1973 | 22 |
| 1974 | 43 |
| 1975 | 54 |
| 1976 | 28 |
| 1977 | 32 |
| 1978 | 26 |
| 1979 | 30 |
| 1980 | 32 |
| 1981 | 59 |
| 1982 | 57 |
| 1983 | 29 |
All-Time Record Progression
3 new records| Date | Kind | Detail |
|---|---|---|
| 1975-07-10 | Record high maximum temperature | Record high maximum temperature 33.3 C (91.9 F) |
| 1975-07-11 | Record high maximum temperature | Record high maximum temperature 33.9 C (93.0 F) |
| 1982-06-28 | Record high minimum temperature | Record high minimum temperature 21.0 C (69.8 F) |
Wettest Day of Each Month
Jul: 49.3 mm (1.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 17.8 mm (0.7 in) | 12 January 1944 |
| Feb | 19.6 mm (0.8 in) | 28 February 1970 |
| Mar | 6.9 mm (0.27 in) | 2 March 1958 |
| Apr | 26.7 mm (1.1 in) | 29 April 1972 |
| May | 20.6 mm (0.8 in) | 10 May 1956 |
| Jun | 45.1 mm (1.8 in) | 23 June 1981 |
| Jul | 49.3 mm (1.9 in) | 19 July 1967 |
| Aug | 48.5 mm (1.9 in) | 16 August 1958 |
| Sep | 26.9 mm (1.1 in) | 2 September 1949 |
| Oct | 19.0 mm (0.7 in) | 1 October 1981 |
| Nov | 16.5 mm (0.6 in) | 28 November 1958 |
| Dec | 17.0 mm (0.7 in) | 22 December 1960 |
Period of Record Coverage
1943 to 1983| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1943 | 245 | 67% | No |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 343 | 94% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 362 | 99% | 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 | 365 | 100% | 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 | 334 | 92% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 363 | 99% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 26 December 1983 | Norman Wells A, CA | daily high min | -11.9 C (10.6 F) | 4.2 C (7.6 F) | 20 years | 15 of 100 (Routine) |
| 26 December 1983 | Norman Wells A, CA | daily high max | -3.8 C (25.2 F) | 1.8 C (3.2 F) | 12 years | 9 of 100 (Routine) |
| 25 December 1983 | Norman Wells A, CA | daily high max | -4.7 C (23.5 F) | 1.4 C (2.5 F) | 20 years | 11 of 100 (Routine) |
| 24 December 1983 | Norman Wells A, CA | daily high max | -2.7 C (27.1 F) | 5.1 C (9.2 F) | 12 years | 13 of 100 (Routine) |
| 19 December 1983 | Norman Wells A, CA | daily high min | -11.3 C (11.7 F) | 2.2 C (4.0 F) | 1 year | 6 of 100 (Routine) |
| 19 December 1983 | Norman Wells A, CA | daily high max | -6.7 C (19.9 F) | 0.8 C (1.4 F) | 1 year | 4 of 100 (Routine) |
| 5 December 1983 | Norman Wells A, CA | daily snowfall | 4.0 cm (1.6 in) | 0.2 cm (0.1 in) | 20 years | 11 of 100 (Routine) |
| 18 November 1983 | Norman Wells A, CA | daily high min | -14.3 C (6.3 F) | 0.7 C (1.3 F) | 38 years | 15 of 100 (Routine) |
| 15 November 1983 | Norman Wells A, CA | daily high min | -10.0 C (14.0 F) | 1.1 C (2.0 F) | 40 years | 17 of 100 (Routine) |
| 14 November 1983 | Norman Wells A, CA | daily high min | -8.1 C (17.4 F) | 1.3 C (2.3 F) | 30 years | 14 of 100 (Routine) |
| 20 October 1983 | Norman Wells A, CA | daily low max | -14.6 C (5.7 F) | 0.7 C (1.3 F) | 26 years | 13 of 100 (Routine) |
| 29 September 1983 | Norman Wells A, CA | daily low max | -1.4 C (29.5 F) | 0.3 C (0.5 F) | 30 years | 13 of 100 (Routine) |
| 28 September 1983 | Norman Wells A, CA | monthly low min | -15.7 C (3.7 F) | 0.7 C (1.3 F) | 8 years | 17 of 100 (Routine) |
| 26 September 1983 | Norman Wells A, CA | daily low min | -8.4 C (16.9 F) | 0.1 C (0.2 F) | 37 years | 15 of 100 (Routine) |
| 26 September 1983 | Norman Wells A, CA | daily low max | -5.1 C (22.8 F) | 2.3 C (4.1 F) | 8 years | 10 of 100 (Routine) |
| 25 September 1983 | Norman Wells A, CA | daily low max | -3.2 C (26.2 F) | 1.5 C (2.7 F) | 26 years | 14 of 100 (Routine) |
| 25 September 1983 | Norman Wells A, CA | daily low min | -7.0 C (19.4 F) | 0.3 C (0.5 F) | 13 years | 8 of 100 (Routine) |
| 28 June 1983 | Norman Wells A, CA | daily high max | 30.2 C (86.4 F) | 0.9 C (1.6 F) | 0 years | 5 of 100 (Routine) |
| 22 May 1983 | Norman Wells A, CA | daily low min | -10.6 C (12.9 F) | 5.0 C (9.0 F) | 14 years | 19 of 100 (Routine) |
| 21 May 1983 | Norman Wells A, CA | daily low min | -11.5 C (11.3 F) | 2.1 C (3.8 F) | 28 years | 16 of 100 (Routine) |
Climate Trend
38 complete years, 1944 to 1983| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1944 | -4.0 C | +2.26 C |
| 1945 | -6.0 C | +0.18 C |
| 1946 | -6.3 C | -0.09 C |
| 1948 | -6.9 C | -0.66 C |
| 1949 | -5.4 C | +0.85 C |
| 1950 | -6.2 C | -0.01 C |
| 1951 | -7.2 C | -1.00 C |
| 1952 | -6.5 C | -0.25 C |
| 1953 | -5.6 C | +0.63 C |
| 1954 | -6.3 C | -0.11 C |
| 1955 | -7.5 C | -1.24 C |
| 1956 | -7.7 C | -1.44 C |
| 1957 | -5.7 C | +0.49 C |
| 1958 | -6.0 C | +0.22 C |
| 1959 | -7.7 C | -1.47 C |
| 1960 | -6.2 C | +0.04 C |
| 1961 | -7.9 C | -1.70 C |
| 1962 | -5.2 C | +1.03 C |
| 1963 | -5.8 C | +0.39 C |
| 1964 | -7.2 C | -0.99 C |
| 1965 | -6.4 C | -0.18 C |
| 1966 | -7.9 C | -1.66 C |
| 1967 | -6.5 C | -0.30 C |
| 1968 | -6.0 C | +0.18 C |
| 1969 | -5.9 C | +0.33 C |
| 1970 | -6.2 C | +0.02 C |
| 1971 | -6.9 C | -0.66 C |
| 1972 | -6.7 C | -0.52 C |
| 1973 | -5.5 C | +0.75 C |
| 1974 | -8.0 C | -1.79 C |
| 1975 | -6.7 C | -0.47 C |
| 1976 | -4.9 C | +1.34 C |
| 1977 | -5.4 C | +0.81 C |
| 1978 | -4.7 C | +1.49 C |
| 1980 | -4.9 C | +1.33 C |
| 1981 | -2.9 C | +3.27 C |
| 1982 | -6.8 C | -0.59 C |
| 1983 | -6.6 C | -0.36 C |
The fitted trend in annual mean temperature here over 1944 to 1983 is 0.1 C (-0.2 to 0.5) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.3 F (-0.3 to 0.8) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.1 C (-0.2 to 0.5) per decade | 0.3 F (-0.3 to 0.8) per decade | 1944 to 1983 | 38 | Not clearly different from zero |
| Mean daily maximum | 0.1 C (-0.2 to 0.4) per decade | 0.2 F (-0.4 to 0.8) per decade | 1944 to 1983 | 38 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (-0.2 to 0.5) per decade | 0.3 F (-0.3 to 0.9) per decade | 1944 to 1983 | 38 | 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) | 33.9 C (93.0 F) | 1975 | 30.6 C (87.1 F) | 41 |
| Coldest night (TNn) | -54.4 C (-65.9 F) | 1947 | -46.1 C (-51.0 F) | 41 |
| Wettest day (Rx1day) | 49.3 mm (1.9 in) | 1967 | 22.8 mm (0.9 in) | 41 |
| Wettest five days (Rx5day) | 82.0 mm (3.2 in) | 1981 | 37.9 mm (1.5 in) | 41 |
| Longest dry spell (CDD) | 73 days | 1978 | 28 days | 41 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1943 | 30.6 C (87.1 F) |
| 1944 | 31.1 C (88.0 F) |
| 1945 | 31.7 C (89.1 F) |
| 1946 | 31.1 C (88.0 F) |
| 1947 | 30.0 C (86.0 F) |
| 1948 | 31.7 C (89.1 F) |
| 1949 | 31.7 C (89.1 F) |
| 1950 | 31.1 C (88.0 F) |
| 1951 | 30.6 C (87.1 F) |
| 1952 | 31.1 C (88.0 F) |
| 1953 | 29.4 C (84.9 F) |
| 1954 | 30.0 C (86.0 F) |
| 1955 | 30.6 C (87.1 F) |
| 1956 | 28.3 C (82.9 F) |
| 1957 | 27.2 C (81.0 F) |
| 1958 | 30.6 C (87.1 F) |
| 1959 | 30.6 C (87.1 F) |
| 1960 | 30.6 C (87.1 F) |
| 1961 | 31.1 C (88.0 F) |
| 1962 | 31.7 C (89.1 F) |
| 1963 | 29.4 C (84.9 F) |
| 1964 | 30.0 C (86.0 F) |
| 1965 | 28.9 C (84.0 F) |
| 1966 | 31.7 C (89.1 F) |
| 1967 | 28.9 C (84.0 F) |
| 1968 | 28.9 C (84.0 F) |
| 1969 | 32.8 C (91.0 F) |
| 1970 | 29.4 C (84.9 F) |
| 1971 | 30.6 C (87.1 F) |
| 1972 | 31.7 C (89.1 F) |
| 1973 | 31.7 C (89.1 F) |
| 1974 | 31.1 C (88.0 F) |
| 1975 | 33.9 C (93.0 F) |
| 1976 | 32.8 C (91.0 F) |
| 1977 | 30.6 C (87.1 F) |
| 1978 | 28.2 C (82.8 F) |
| 1979 | 30.7 C (87.3 F) |
| 1980 | 30.2 C (86.4 F) |
| 1981 | 31.8 C (89.2 F) |
| 1982 | 33.9 C (93.0 F) |
| 1983 | 32.2 C (90.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1943 | -37.2 C (-35.0 F) |
| 1944 | -43.9 C (-47.0 F) |
| 1945 | -42.8 C (-45.0 F) |
| 1946 | -47.2 C (-53.0 F) |
| 1947 | -54.4 C (-65.9 F) |
| 1948 | -46.7 C (-52.1 F) |
| 1949 | -48.3 C (-54.9 F) |
| 1950 | -45.0 C (-49.0 F) |
| 1951 | -50.0 C (-58.0 F) |
| 1952 | -52.2 C (-62.0 F) |
| 1953 | -44.4 C (-47.9 F) |
| 1954 | -48.9 C (-56.0 F) |
| 1955 | -46.1 C (-51.0 F) |
| 1956 | -47.2 C (-53.0 F) |
| 1957 | -46.1 C (-51.0 F) |
| 1958 | -45.6 C (-50.1 F) |
| 1959 | -46.1 C (-51.0 F) |
| 1960 | -47.2 C (-53.0 F) |
| 1961 | -46.7 C (-52.1 F) |
| 1962 | -48.3 C (-54.9 F) |
| 1963 | -50.0 C (-58.0 F) |
| 1964 | -46.7 C (-52.1 F) |
| 1965 | -47.2 C (-53.0 F) |
| 1966 | -50.0 C (-58.0 F) |
| 1967 | -46.1 C (-51.0 F) |
| 1968 | -51.7 C (-61.1 F) |
| 1969 | -46.1 C (-51.0 F) |
| 1970 | -45.0 C (-49.0 F) |
| 1971 | -48.9 C (-56.0 F) |
| 1972 | -45.6 C (-50.1 F) |
| 1973 | -47.2 C (-53.0 F) |
| 1974 | -45.0 C (-49.0 F) |
| 1975 | -49.4 C (-56.9 F) |
| 1976 | -46.1 C (-51.0 F) |
| 1977 | -43.8 C (-46.8 F) |
| 1978 | -39.6 C (-39.3 F) |
| 1979 | -48.1 C (-54.6 F) |
| 1980 | -44.5 C (-48.1 F) |
| 1981 | -37.8 C (-36.0 F) |
| 1982 | -45.0 C (-49.0 F) |
| 1983 | -44.4 C (-47.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1943 | 21.1 mm (0.8 in) |
| 1944 | 18.5 mm (0.7 in) |
| 1945 | 19.1 mm (0.8 in) |
| 1946 | 22.9 mm (0.9 in) |
| 1947 | 14.0 mm (0.6 in) |
| 1948 | 22.9 mm (0.9 in) |
| 1949 | 36.3 mm (1.4 in) |
| 1950 | 17.3 mm (0.7 in) |
| 1951 | 18.5 mm (0.7 in) |
| 1952 | 45.2 mm (1.8 in) |
| 1953 | 17.0 mm (0.7 in) |
| 1954 | 32.5 mm (1.3 in) |
| 1955 | 36.1 mm (1.4 in) |
| 1956 | 20.6 mm (0.8 in) |
| 1957 | 32.0 mm (1.3 in) |
| 1958 | 48.5 mm (1.9 in) |
| 1959 | 22.6 mm (0.9 in) |
| 1960 | 31.8 mm (1.3 in) |
| 1961 | 24.6 mm (1.0 in) |
| 1962 | 19.3 mm (0.8 in) |
| 1963 | 20.1 mm (0.8 in) |
| 1964 | 31.0 mm (1.2 in) |
| 1965 | 23.1 mm (0.9 in) |
| 1966 | 48.3 mm (1.9 in) |
| 1967 | 49.3 mm (1.9 in) |
| 1968 | 18.3 mm (0.7 in) |
| 1969 | 24.6 mm (1.0 in) |
| 1970 | 26.9 mm (1.1 in) |
| 1971 | 32.5 mm (1.3 in) |
| 1972 | 26.7 mm (1.1 in) |
| 1973 | 17.0 mm (0.7 in) |
| 1974 | 45.2 mm (1.8 in) |
| 1975 | 16.3 mm (0.6 in) |
| 1976 | 12.7 mm (0.5 in) |
| 1977 | 19.3 mm (0.8 in) |
| 1978 | 20.8 mm (0.8 in) |
| 1979 | 15.2 mm (0.6 in) |
| 1980 | 20.1 mm (0.8 in) |
| 1981 | 45.1 mm (1.8 in) |
| 1982 | 22.8 mm (0.9 in) |
| 1983 | 10.0 mm (0.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1943 | 49.3 mm (1.9 in) |
| 1944 | 28.2 mm (1.1 in) |
| 1945 | 42.9 mm (1.7 in) |
| 1946 | 25.9 mm (1.0 in) |
| 1947 | 23.9 mm (0.9 in) |
| 1948 | 44.2 mm (1.7 in) |
| 1949 | 76.6 mm (3.0 in) |
| 1950 | 19.7 mm (0.8 in) |
| 1951 | 35.9 mm (1.4 in) |
| 1952 | 71.4 mm (2.8 in) |
| 1953 | 29.9 mm (1.2 in) |
| 1954 | 43.5 mm (1.7 in) |
| 1955 | 57.1 mm (2.2 in) |
| 1956 | 29.5 mm (1.2 in) |
| 1957 | 36.1 mm (1.4 in) |
| 1958 | 63.2 mm (2.5 in) |
| 1959 | 60.2 mm (2.4 in) |
| 1960 | 62.6 mm (2.5 in) |
| 1961 | 44.5 mm (1.8 in) |
| 1962 | 35.3 mm (1.4 in) |
| 1963 | 38.7 mm (1.5 in) |
| 1964 | 37.6 mm (1.5 in) |
| 1965 | 41.1 mm (1.6 in) |
| 1966 | 48.6 mm (1.9 in) |
| 1967 | 72.9 mm (2.9 in) |
| 1968 | 26.2 mm (1.0 in) |
| 1969 | 49.8 mm (2.0 in) |
| 1970 | 34.3 mm (1.4 in) |
| 1971 | 45.4 mm (1.8 in) |
| 1972 | 49.0 mm (1.9 in) |
| 1973 | 34.0 mm (1.3 in) |
| 1974 | 71.6 mm (2.8 in) |
| 1975 | 21.1 mm (0.8 in) |
| 1976 | 32.4 mm (1.3 in) |
| 1977 | 37.9 mm (1.5 in) |
| 1978 | 37.6 mm (1.5 in) |
| 1979 | 24.2 mm (1.0 in) |
| 1980 | 34.4 mm (1.4 in) |
| 1981 | 82.0 mm (3.2 in) |
| 1982 | 31.6 mm (1.2 in) |
| 1983 | 17.1 mm (0.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1943 | 23 days |
| 1944 | 24 days |
| 1945 | 24 days |
| 1946 | 17 days |
| 1947 | 35 days |
| 1948 | 15 days |
| 1949 | 16 days |
| 1950 | 51 days |
| 1951 | 42 days |
| 1952 | 24 days |
| 1953 | 41 days |
| 1954 | 21 days |
| 1955 | 32 days |
| 1956 | 41 days |
| 1957 | 33 days |
| 1958 | 24 days |
| 1959 | 43 days |
| 1960 | 18 days |
| 1961 | 27 days |
| 1962 | 20 days |
| 1963 | 34 days |
| 1964 | 19 days |
| 1965 | 25 days |
| 1966 | 35 days |
| 1967 | 36 days |
| 1968 | 37 days |
| 1969 | 32 days |
| 1970 | 34 days |
| 1971 | 26 days |
| 1972 | 32 days |
| 1973 | 28 days |
| 1974 | 30 days |
| 1975 | 28 days |
| 1976 | 23 days |
| 1977 | 33 days |
| 1978 | 73 days |
| 1979 | 66 days |
| 1980 | 25 days |
| 1981 | 34 days |
| 1982 | 28 days |
| 1983 | 20 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
38 years with a frostAcross 38 years with a frost, the median last spring frost at Norman Wells A falls on 26 May and the median first autumn frost on 3 September, which leaves a median of 99 days between them.
Fitted over all years, the growing season changes by +5.4 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 | 26 May | n/a | 26 May | n/a | -1.8 days per decade |
| First autumn frost | 3 September | n/a | 4 September | n/a | +3.5 days per decade |
| Growing days | 99 days | n/a | 101 days | n/a | +5.4 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 23.6 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 66.7 mm (2.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 23.6 mm (0.9 in) | |
| 5 years | 33.3 mm (1.3 in) | |
| 10 years | 40.3 mm (1.6 in) | |
| 25 years | 50.2 mm (2.0 in) | |
| 50 years | 58.2 mm (2.3 in) | Longer than the 40 years of record |
| 100 years | 66.7 mm (2.6 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: 49.3 mm (1.9 in) in 1967; 48.5 mm (1.9 in) in 1958; 48.3 mm (1.9 in) in 1966.
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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).