Altona Weather Records (CA005020040)
Record envelope, standing records and threshold days for Altona (CA005020040), Manitoba, Canada, with 61 years of record.
Key Facts for Altona
- Altona (CA005020040) is a weather station in Manitoba, Canada at 49.10 latitude and -97.55 longitude, 248 m (814 ft) above sea level.
- The station reports from 1948 to 2008, 61 years of record.
- 1,464 records set at Altona still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Altona set a daily record low minimum temperature of -35.0 C (-31.0 F) on 24 December 1983.
About the Station
- Location: Manitoba, Canada, 49.10 latitude, -97.55 longitude.
- Elevation: 248 m (814 ft).
- Period of record: 1948 to 2008, 61 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 | 6.7 C (44.1 F) | -40.0 C (-40.0 F) | n/a | n/a |
| Feb | 10.0 C (50.0 F) | -40.6 C (-41.1 F) | n/a | n/a |
| Mar | 22.2 C (72.0 F) | -33.5 C (-28.3 F) | n/a | n/a |
| Apr | 35.6 C (96.1 F) | -23.9 C (-11.0 F) | n/a | n/a |
| May | 36.7 C (98.1 F) | -13.9 C (7.0 F) | n/a | n/a |
| Jun | 35.6 C (96.1 F) | -2.8 C (27.0 F) | n/a | n/a |
| Jul | 38.9 C (102.0 F) | 2.8 C (37.0 F) | n/a | n/a |
| Aug | 38.9 C (102.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Sep | 39.0 C (102.2 F) | -6.7 C (19.9 F) | n/a | n/a |
| Oct | 28.9 C (84.0 F) | -13.9 C (7.0 F) | n/a | n/a |
| Nov | 25.0 C (77.0 F) | -29.4 C (-20.9 F) | n/a | n/a |
| Dec | 14.4 C (57.9 F) | -37.2 C (-35.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 48 |
| 1950 | 62 |
| 1951 | 60 |
| 1952 | 57 |
| 1953 | 36 |
| 1954 | 19 |
| 1955 | 32 |
| 1956 | 22 |
| 1957 | 15 |
| 1958 | 38 |
| 1959 | 28 |
| 1960 | 13 |
| 1961 | 27 |
| 1962 | 35 |
| 1963 | 55 |
| 1964 | 61 |
| 1965 | 38 |
| 1966 | 59 |
| 1967 | 51 |
| 1968 | 46 |
| 1969 | 32 |
| 1970 | 36 |
| 1971 | 20 |
| 1972 | 61 |
| 1973 | 52 |
| 1974 | 34 |
| 1975 | 40 |
| 1976 | 56 |
| 1977 | 57 |
| 1978 | 28 |
| 1979 | 58 |
| 1980 | 44 |
| 1981 | 60 |
| 1982 | 33 |
| 1983 | 51 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 1983-09-02 | Record high maximum temperature | Record high maximum temperature 39.0 C (102.2 F) |
Wettest Day of Each Month
Jun: 116.1 mm (4.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 22.9 mm (0.9 in) | 15 January 1949 |
| Feb | 19.6 mm (0.8 in) | 23 February 1949 |
| Mar | 22.9 mm (0.9 in) | 4 March 1966 |
| Apr | 33.5 mm (1.3 in) | 17 April 1979 |
| May | 40.4 mm (1.6 in) | 21 May 1973 |
| Jun | 116.1 mm (4.6 in) | 10 June 1970 |
| Jul | 101.3 mm (4.0 in) | 11 July 1957 |
| Aug | 54.6 mm (2.1 in) | 17 August 1954 |
| Sep | 77.2 mm (3.0 in) | 2 September 1957 |
| Oct | 57.7 mm (2.3 in) | 10 October 1949 |
| Nov | 16.3 mm (0.6 in) | 2 November 1948 |
| Dec | 22.9 mm (0.9 in) | 22 December 1974 |
Period of Record Coverage
1949 to 1983| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 275 | 75% | No |
| 1950 | 365 | 100% | Yes |
| 1951 | 362 | 99% | Yes |
| 1952 | 332 | 91% | Yes |
| 1953 | 184 | 50% | No |
| 1954 | 214 | 59% | No |
| 1955 | 214 | 59% | No |
| 1956 | 210 | 57% | No |
| 1957 | 212 | 58% | No |
| 1958 | 198 | 54% | No |
| 1959 | 213 | 58% | No |
| 1960 | 182 | 50% | No |
| 1961 | 183 | 50% | No |
| 1962 | 259 | 71% | No |
| 1963 | 358 | 98% | Yes |
| 1964 | 363 | 99% | Yes |
| 1965 | 363 | 99% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 364 | 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 | 365 | 100% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 360 | 99% | Yes |
| 1983 | 332 | 91% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 December 1983 | Altona, CA | daily low min | -35.0 C (-31.0 F) | 3.9 C (7.0 F) | 33 years | 17 of 100 (Routine) |
| 23 December 1983 | Altona, CA | daily low max | -28.0 C (-18.4 F) | 5.8 C (10.4 F) | 33 years | 20 of 100 (Routine) |
| 23 December 1983 | Altona, CA | daily low min | -35.0 C (-31.0 F) | 3.3 C (5.9 F) | 32 years | 16 of 100 (Routine) |
| 22 December 1983 | Altona, CA | daily low max | -27.0 C (-16.6 F) | 6.4 C (11.5 F) | 33 years | 21 of 100 (Routine) |
| 22 December 1983 | Altona, CA | daily low min | -30.0 C (-22.0 F) | 0.6 C (1.1 F) | 16 years | 8 of 100 (Routine) |
| 17 December 1983 | Altona, CA | daily low max | -25.0 C (-13.0 F) | 1.7 C (3.1 F) | 18 years | 10 of 100 (Routine) |
| 16 December 1983 | Altona, CA | daily low max | -24.0 C (-11.2 F) | 2.9 C (5.2 F) | 8 years | 8 of 100 (Routine) |
| 29 November 1983 | Altona, CA | daily rain | 2.0 mm (0.08 in) | 0.7 mm (0.03 in) | 16 years | 10 of 100 (Routine) |
| 29 November 1983 | Altona, CA | daily snowfall | 2.0 cm (0.8 in) | 0.7 cm (0.3 in) | 16 years | 10 of 100 (Routine) |
| 20 November 1983 | Altona, CA | daily high min | -0.5 C (31.1 F) | 1.5 C (2.7 F) | 0 years | 5 of 100 (Routine) |
| 1 November 1983 | Altona, CA | daily high min | 4.5 C (40.1 F) | 0.1 C (0.2 F) | 33 years | 13 of 100 (Routine) |
| 11 October 1983 | Altona, CA | daily snowfall | 1.0 cm (0.4 in) | 1.0 cm (0.4 in) | 33 years | 15 of 100 (Routine) |
| 28 September 1983 | Altona, CA | daily high min | 12.0 C (53.6 F) | 1.4 C (2.5 F) | 30 years | 15 of 100 (Routine) |
| 15 September 1983 | Altona, CA | daily rain | 6.2 mm (0.24 in) | 0.6 mm (0.02 in) | 14 years | 7 of 100 (Routine) |
| 14 September 1983 | Altona, CA | daily rain (Tie) | 13.0 mm (0.5 in) | tie | 17 years | 2 of 100 (Routine) |
| 8 September 1983 | Altona, CA | daily rain | 20.6 mm (0.8 in) | 0.8 mm (0.03 in) | 5 years | 4 of 100 (Routine) |
| 2 September 1983 | Altona, CA | all-time high max | 39.0 C (102.2 F) | 0.1 C (0.2 F) | 34 years | 33 of 100 (Routine) |
| 2 September 1983 | Altona, CA | daily high min | 16.0 C (60.8 F) | 1.0 C (1.8 F) | 18 years | 10 of 100 (Routine) |
| 1 September 1983 | Altona, CA | daily high max | 34.5 C (94.1 F) | 4.5 C (8.1 F) | 4 years | 11 of 100 (Routine) |
| 27 August 1983 | Altona, CA | daily rain | 5.6 mm (0.22 in) | 1.0 mm (0.04 in) | 30 years | 13 of 100 (Routine) |
Climate Trend
21 complete years, 1950 to 1982| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1950 | 0.7 C | -2.08 C |
| 1951 | 1.7 C | -1.01 C |
| 1963 | 4.0 C | +1.30 C |
| 1964 | 2.9 C | +0.15 C |
| 1966 | 1.5 C | -1.23 C |
| 1967 | 2.3 C | -0.40 C |
| 1968 | 2.8 C | +0.11 C |
| 1969 | 2.5 C | -0.21 C |
| 1970 | 2.1 C | -0.65 C |
| 1971 | 2.7 C | -0.06 C |
| 1972 | 1.9 C | -0.84 C |
| 1973 | 4.1 C | +1.35 C |
| 1974 | 2.4 C | -0.30 C |
| 1975 | 3.2 C | +0.46 C |
| 1976 | 3.2 C | +0.50 C |
| 1977 | 4.2 C | +1.42 C |
| 1978 | 2.6 C | -0.11 C |
| 1979 | 1.3 C | -1.40 C |
| 1980 | 3.6 C | +0.89 C |
| 1981 | 5.1 C | +2.40 C |
| 1982 | 2.4 C | -0.31 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1948 to 1983| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 39.0 C (102.2 F) | 1983 | 35.6 C (96.1 F) | 35 |
| Coldest night (TNn) | -40.6 C (-41.1 F) | 1966 | -33.9 C (-29.0 F) | 35 |
| Wettest day (Rx1day) | 116.1 mm (4.6 in) | 1970 | 37.4 mm (1.5 in) | 36 |
| Wettest five days (Rx5day) | 139.2 mm (5.5 in) | 1970 | 58.7 mm (2.3 in) | 36 |
| Longest dry spell (CDD) | 55 days | 1976 | 23 days | 36 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | n/a |
| 1949 | 38.9 C (102.0 F) |
| 1950 | 34.4 C (93.9 F) |
| 1951 | 37.8 C (100.0 F) |
| 1952 | 37.2 C (99.0 F) |
| 1953 | 35.6 C (96.1 F) |
| 1954 | 35.0 C (95.0 F) |
| 1955 | 36.1 C (97.0 F) |
| 1956 | 33.9 C (93.0 F) |
| 1957 | 33.3 C (91.9 F) |
| 1958 | 35.0 C (95.0 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 35.0 C (95.0 F) |
| 1961 | 36.7 C (98.1 F) |
| 1962 | 32.8 C (91.0 F) |
| 1963 | 33.9 C (93.0 F) |
| 1964 | 37.2 C (99.0 F) |
| 1965 | 36.7 C (98.1 F) |
| 1966 | 33.3 C (91.9 F) |
| 1967 | 36.1 C (97.0 F) |
| 1968 | 33.9 C (93.0 F) |
| 1969 | 35.6 C (96.1 F) |
| 1970 | 35.6 C (96.1 F) |
| 1971 | 34.4 C (93.9 F) |
| 1972 | 37.2 C (99.0 F) |
| 1973 | 34.4 C (93.9 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 38.9 C (102.0 F) |
| 1976 | 36.7 C (98.1 F) |
| 1977 | 33.9 C (93.0 F) |
| 1978 | 38.9 C (102.0 F) |
| 1979 | 35.0 C (95.0 F) |
| 1980 | 36.0 C (96.8 F) |
| 1981 | 36.5 C (97.7 F) |
| 1982 | 34.0 C (93.2 F) |
| 1983 | 39.0 C (102.2 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | n/a |
| 1949 | -31.1 C (-24.0 F) |
| 1950 | -37.2 C (-35.0 F) |
| 1951 | -37.2 C (-35.0 F) |
| 1952 | -33.9 C (-29.0 F) |
| 1953 | -7.8 C (18.0 F) |
| 1954 | -20.0 C (-4.0 F) |
| 1955 | -8.3 C (17.1 F) |
| 1956 | -12.8 C (9.0 F) |
| 1957 | -20.0 C (-4.0 F) |
| 1958 | -13.9 C (7.0 F) |
| 1959 | -11.1 C (12.0 F) |
| 1960 | -11.1 C (12.0 F) |
| 1961 | -9.4 C (15.1 F) |
| 1962 | -28.3 C (-18.9 F) |
| 1963 | -35.6 C (-32.1 F) |
| 1964 | -33.9 C (-29.0 F) |
| 1965 | -34.4 C (-29.9 F) |
| 1966 | -40.6 C (-41.1 F) |
| 1967 | -37.2 C (-35.0 F) |
| 1968 | -38.3 C (-36.9 F) |
| 1969 | -33.3 C (-27.9 F) |
| 1970 | -37.2 C (-35.0 F) |
| 1971 | -36.1 C (-33.0 F) |
| 1972 | -36.7 C (-34.1 F) |
| 1973 | -32.8 C (-27.0 F) |
| 1974 | -35.0 C (-31.0 F) |
| 1975 | -31.7 C (-25.1 F) |
| 1976 | -33.3 C (-27.9 F) |
| 1977 | -36.1 C (-33.0 F) |
| 1978 | -34.4 C (-29.9 F) |
| 1979 | -36.7 C (-34.1 F) |
| 1980 | -34.5 C (-30.1 F) |
| 1981 | -32.0 C (-25.6 F) |
| 1982 | -35.0 C (-31.0 F) |
| 1983 | -35.0 C (-31.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 19.1 mm (0.8 in) |
| 1949 | 57.7 mm (2.3 in) |
| 1950 | 33.8 mm (1.3 in) |
| 1951 | 25.7 mm (1.0 in) |
| 1952 | 36.3 mm (1.4 in) |
| 1953 | 46.7 mm (1.8 in) |
| 1954 | 54.6 mm (2.1 in) |
| 1955 | 36.8 mm (1.4 in) |
| 1956 | 32.3 mm (1.3 in) |
| 1957 | 101.3 mm (4.0 in) |
| 1958 | 41.4 mm (1.6 in) |
| 1959 | 37.8 mm (1.5 in) |
| 1960 | 23.1 mm (0.9 in) |
| 1961 | 23.1 mm (0.9 in) |
| 1962 | 30.5 mm (1.2 in) |
| 1963 | 96.5 mm (3.8 in) |
| 1964 | 48.5 mm (1.9 in) |
| 1965 | 35.6 mm (1.4 in) |
| 1966 | 79.5 mm (3.1 in) |
| 1967 | 27.2 mm (1.1 in) |
| 1968 | 58.4 mm (2.3 in) |
| 1969 | 30.7 mm (1.2 in) |
| 1970 | 116.1 mm (4.6 in) |
| 1971 | 20.3 mm (0.8 in) |
| 1972 | 28.2 mm (1.1 in) |
| 1973 | 52.3 mm (2.1 in) |
| 1974 | 31.8 mm (1.3 in) |
| 1975 | 33.0 mm (1.3 in) |
| 1976 | 64.8 mm (2.6 in) |
| 1977 | 42.2 mm (1.7 in) |
| 1978 | 61.2 mm (2.4 in) |
| 1979 | 50.3 mm (2.0 in) |
| 1980 | 49.4 mm (1.9 in) |
| 1981 | 37.0 mm (1.5 in) |
| 1982 | 50.0 mm (2.0 in) |
| 1983 | 25.0 mm (1.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 30.3 mm (1.2 in) |
| 1949 | 82.6 mm (3.3 in) |
| 1950 | 65.3 mm (2.6 in) |
| 1951 | 51.6 mm (2.0 in) |
| 1952 | 46.8 mm (1.8 in) |
| 1953 | 56.6 mm (2.2 in) |
| 1954 | 58.9 mm (2.3 in) |
| 1955 | 52.8 mm (2.1 in) |
| 1956 | 52.9 mm (2.1 in) |
| 1957 | 103.3 mm (4.1 in) |
| 1958 | 87.6 mm (3.4 in) |
| 1959 | 60.2 mm (2.4 in) |
| 1960 | 54.9 mm (2.2 in) |
| 1961 | 48.9 mm (1.9 in) |
| 1962 | 55.7 mm (2.2 in) |
| 1963 | 96.5 mm (3.8 in) |
| 1964 | 66.0 mm (2.6 in) |
| 1965 | 53.9 mm (2.1 in) |
| 1966 | 100.1 mm (3.9 in) |
| 1967 | 55.2 mm (2.2 in) |
| 1968 | 58.4 mm (2.3 in) |
| 1969 | 40.9 mm (1.6 in) |
| 1970 | 139.2 mm (5.5 in) |
| 1971 | 31.7 mm (1.2 in) |
| 1972 | 34.5 mm (1.4 in) |
| 1973 | 81.5 mm (3.2 in) |
| 1974 | 56.7 mm (2.2 in) |
| 1975 | 58.5 mm (2.3 in) |
| 1976 | 71.5 mm (2.8 in) |
| 1977 | 60.9 mm (2.4 in) |
| 1978 | 101.6 mm (4.0 in) |
| 1979 | 60.0 mm (2.4 in) |
| 1980 | 71.2 mm (2.8 in) |
| 1981 | 67.0 mm (2.6 in) |
| 1982 | 75.4 mm (3.0 in) |
| 1983 | 41.0 mm (1.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 11 days |
| 1949 | 30 days |
| 1950 | 26 days |
| 1951 | 20 days |
| 1952 | 35 days |
| 1953 | 20 days |
| 1954 | 22 days |
| 1955 | 16 days |
| 1956 | 26 days |
| 1957 | 18 days |
| 1958 | 26 days |
| 1959 | 15 days |
| 1960 | 21 days |
| 1961 | 35 days |
| 1962 | 21 days |
| 1963 | 28 days |
| 1964 | 37 days |
| 1965 | 23 days |
| 1966 | 27 days |
| 1967 | 28 days |
| 1968 | 21 days |
| 1969 | 29 days |
| 1970 | 17 days |
| 1971 | 22 days |
| 1972 | 19 days |
| 1973 | 33 days |
| 1974 | 18 days |
| 1975 | 23 days |
| 1976 | 55 days |
| 1977 | 27 days |
| 1978 | 23 days |
| 1979 | 15 days |
| 1980 | 49 days |
| 1981 | 26 days |
| 1982 | 13 days |
| 1983 | 14 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
21 years with a frostAcross 21 years with a frost, the median last spring frost at Altona falls on 14 May and the median first autumn frost on 24 September, which leaves a median of 130 days between them.
| Measure | Median, all years | Earliest period | Recent period (1950 to 1982) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 14 May | n/a | 14 May | n/a | n/a |
| First autumn frost | 24 September | n/a | 24 September | n/a | n/a |
| Growing days | 130 days | n/a | 130 days | n/a | n/a |
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.
Download the Data
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).