Montreal River Weather Records (CA006075379)
Record envelope, standing records and threshold days for Montreal River (CA006075379), Ontario, Canada, with 58 years of record.
Key Facts for Montreal River
- Montreal River (CA006075379) is a weather station in Ontario, Canada at 47.12 latitude and -79.48 longitude, 183 m (600 ft) above sea level.
- The station reports from 1910 to 1967, 58 years of record.
- 1,464 records set at Montreal River still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Montreal River set a daily record low maximum temperature of 4.4 C (39.9 F) on 28 September 1967.
About the Station
- Location: Ontario, Canada, 47.12 latitude, -79.48 longitude.
- Elevation: 183 m (600 ft).
- Period of record: 1910 to 1967, 58 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 | 10.6 C (51.1 F) | -45.0 C (-49.0 F) | n/a | n/a |
| Feb | 12.8 C (55.0 F) | -46.7 C (-52.1 F) | n/a | n/a |
| Mar | 24.4 C (75.9 F) | -42.2 C (-44.0 F) | n/a | n/a |
| Apr | 31.1 C (88.0 F) | -28.9 C (-20.0 F) | n/a | n/a |
| May | 35.0 C (95.0 F) | -10.6 C (12.9 F) | n/a | n/a |
| Jun | 37.8 C (100.0 F) | -3.9 C (25.0 F) | n/a | n/a |
| Jul | 38.9 C (102.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Aug | 36.7 C (98.1 F) | -5.0 C (23.0 F) | n/a | n/a |
| Sep | 33.3 C (91.9 F) | -11.1 C (12.0 F) | n/a | n/a |
| Oct | 27.8 C (82.0 F) | -15.0 C (5.0 F) | n/a | n/a |
| Nov | 19.4 C (66.9 F) | -32.8 C (-27.0 F) | n/a | n/a |
| Dec | 13.9 C (57.0 F) | -46.1 C (-51.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1910 | 1 |
| 1911 | 38 |
| 1912 | 22 |
| 1913 | 58 |
| 1914 | 50 |
| 1915 | 24 |
| 1916 | 38 |
| 1917 | 20 |
| 1918 | 26 |
| 1919 | 32 |
| 1920 | 41 |
| 1921 | 38 |
| 1922 | 32 |
| 1923 | 42 |
| 1924 | 19 |
| 1925 | 28 |
| 1926 | 25 |
| 1927 | 30 |
| 1928 | 21 |
| 1929 | 30 |
| 1930 | 37 |
| 1931 | 22 |
| 1932 | 24 |
| 1933 | 40 |
| 1934 | 40 |
| 1935 | 16 |
| 1936 | 36 |
| 1937 | 14 |
| 1938 | 20 |
| 1939 | 19 |
| 1940 | 17 |
| 1941 | 17 |
| 1942 | 25 |
| 1943 | 27 |
| 1944 | 20 |
| 1945 | 31 |
| 1946 | 21 |
| 1947 | 34 |
| 1948 | 22 |
| 1949 | 21 |
| 1950 | 24 |
| 1951 | 29 |
| 1952 | 15 |
| 1953 | 20 |
| 1954 | 16 |
| 1955 | 14 |
| 1956 | 14 |
| 1957 | 16 |
| 1958 | 21 |
| 1959 | 17 |
| 1960 | 11 |
| 1961 | 17 |
| 1962 | 26 |
| 1963 | 22 |
| 1964 | 32 |
| 1965 | 24 |
| 1966 | 20 |
| 1967 | 8 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1960-06-24 | Record daily precipitation | Record daily precipitation 112.3 mm (4.4 in) |
| 1965-02-25 | Record daily snowfall | Record daily snowfall 66.0 cm (26.0 in) |
Wettest Day of Each Month
Jun: 112.3 mm (4.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 27.9 mm (1.1 in) | 31 January 1914 |
| Feb | 35.6 mm (1.4 in) | 22 February 1912 |
| Mar | 48.3 mm (1.9 in) | 27 March 1917 |
| Apr | 34.5 mm (1.4 in) | 5 April 1929 |
| May | 34.5 mm (1.4 in) | 24 May 1946 |
| Jun | 112.3 mm (4.4 in) | 24 June 1960 |
| Jul | 66.8 mm (2.6 in) | 18 July 1941 |
| Aug | 107.2 mm (4.2 in) | 16 August 1932 |
| Sep | 69.9 mm (2.8 in) | 10 September 1937 |
| Oct | 53.8 mm (2.1 in) | 10 October 1932 |
| Nov | 46.2 mm (1.8 in) | 17 November 1931 |
| Dec | 33.0 mm (1.3 in) | 8 December 1946 |
Period of Record Coverage
1910 to 1967| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1910 | 29 | 8% | No |
| 1911 | 357 | 98% | Yes |
| 1912 | 355 | 97% | Yes |
| 1913 | 365 | 100% | Yes |
| 1914 | 364 | 100% | Yes |
| 1915 | 332 | 91% | Yes |
| 1916 | 365 | 100% | Yes |
| 1917 | 365 | 100% | Yes |
| 1918 | 365 | 100% | Yes |
| 1919 | 365 | 100% | Yes |
| 1920 | 366 | 100% | Yes |
| 1921 | 365 | 100% | Yes |
| 1922 | 365 | 100% | Yes |
| 1923 | 364 | 100% | Yes |
| 1924 | 366 | 100% | Yes |
| 1925 | 365 | 100% | Yes |
| 1926 | 364 | 100% | Yes |
| 1927 | 365 | 100% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 339 | 93% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 362 | 99% | Yes |
| 1932 | 365 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 364 | 100% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 364 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 364 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 332 | 91% | 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 | 363 | 99% | Yes |
| 1962 | 363 | 99% | Yes |
| 1963 | 358 | 98% | Yes |
| 1964 | 351 | 96% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 234 | 64% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 28 September 1967 | Montreal River, CA | daily low max | 4.4 C (39.9 F) | 1.2 C (2.2 F) | 22 years | 13 of 100 (Routine) |
| 21 August 1967 | Montreal River, CA | daily low max | 15.6 C (60.1 F) | 0.5 C (0.9 F) | 20 years | 12 of 100 (Routine) |
| 18 August 1967 | Montreal River, CA | daily low max | 12.8 C (55.0 F) | 1.6 C (2.9 F) | 34 years | 18 of 100 (Routine) |
| 10 August 1967 | Montreal River, CA | daily low max (Tie) | 16.1 C (61.0 F) | tie | 53 years | 5 of 100 (Routine) |
| 7 August 1967 | Montreal River, CA | daily rain | 15.5 mm (0.6 in) | 0.3 mm (0.01 in) | 49 years | 19 of 100 (Routine) |
| 14 July 1967 | Montreal River, CA | daily low max | 14.4 C (57.9 F) | 1.7 C (3.1 F) | 28 years | 16 of 100 (Routine) |
| 3 July 1967 | Montreal River, CA | daily low max | 14.4 C (57.9 F) | 2.8 C (5.0 F) | 10 years | 14 of 100 (Routine) |
| 15 June 1967 | Montreal River, CA | daily high min (Tie) | 17.8 C (64.0 F) | tie | 17 years | 2 of 100 (Routine) |
| 12 June 1967 | Montreal River, CA | daily rain | 29.2 mm (1.1 in) | 6.3 mm (0.25 in) | 24 years | 18 of 100 (Routine) |
| 11 June 1967 | Montreal River, CA | daily rain | 50.8 mm (2.0 in) | 34.0 mm (1.3 in) | 37 years | 50 of 100 (Notable) |
| 20 May 1967 | Montreal River, CA | daily low max | 5.0 C (41.0 F) | 2.8 C (5.0 F) | 18 years | 14 of 100 (Routine) |
| 10 May 1967 | Montreal River, CA | daily low max | 2.8 C (37.0 F) | 2.2 C (4.0 F) | 6 years | 10 of 100 (Routine) |
| 30 April 1967 | Montreal River, CA | daily rain | 17.3 mm (0.7 in) | 4.6 mm (0.18 in) | 4 years | 13 of 100 (Routine) |
| 22 April 1967 | Montreal River, CA | daily rain | 25.9 mm (1.0 in) | 5.8 mm (0.23 in) | 46 years | 28 of 100 (Routine) |
| 31 March 1967 | Montreal River, CA | daily high max | 16.7 C (62.1 F) | 2.8 C (5.0 F) | 12 years | 12 of 100 (Routine) |
| 31 March 1967 | Montreal River, CA | daily high min (Tie) | 0.0 C (32.0 F) | tie | 48 years | 4 of 100 (Routine) |
| 15 February 1967 | Montreal River, CA | daily rain | 33.0 mm (1.3 in) | 17.8 mm (0.7 in) | 48 years | 59 of 100 (Notable) |
| 15 February 1967 | Montreal River, CA | daily snowfall | 33.0 cm (13.0 in) | 17.8 cm (7.0 in) | 48 years | 55 of 100 (Notable) |
| 27 January 1967 | Montreal River, CA | daily snowfall | 24.1 cm (9.5 in) | 15.2 cm (6.0 in) | 8 years | 42 of 100 (Notable) |
| 27 January 1967 | Montreal River, CA | daily rain | 24.1 mm (0.9 in) | 15.2 mm (0.6 in) | 8 years | 20 of 100 (Routine) |
Climate Trend
47 complete years, 1911 to 1966| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1911 | 3.1 C | +0.80 C |
| 1912 | 2.6 C | +0.21 C |
| 1914 | 2.0 C | -0.31 C |
| 1916 | 3.5 C | +1.14 C |
| 1917 | 1.8 C | -0.55 C |
| 1918 | 2.2 C | -0.18 C |
| 1919 | 3.6 C | +1.27 C |
| 1920 | 2.2 C | -0.12 C |
| 1921 | 3.9 C | +1.59 C |
| 1922 | 2.8 C | +0.41 C |
| 1923 | 1.8 C | -0.58 C |
| 1924 | 1.4 C | -0.97 C |
| 1925 | 1.8 C | -0.52 C |
| 1926 | 0.8 C | -1.58 C |
| 1927 | 2.0 C | -0.30 C |
| 1928 | 1.8 C | -0.52 C |
| 1930 | 2.4 C | +0.08 C |
| 1931 | 3.7 C | +1.40 C |
| 1932 | 2.6 C | +0.24 C |
| 1933 | 1.6 C | -0.70 C |
| 1934 | 1.0 C | -1.35 C |
| 1935 | 1.4 C | -0.96 C |
| 1936 | 0.9 C | -1.43 C |
| 1937 | 2.9 C | +0.53 C |
| 1938 | 2.6 C | +0.23 C |
| 1939 | 1.8 C | -0.59 C |
| 1940 | 1.3 C | -1.03 C |
| 1941 | 2.4 C | +0.09 C |
| 1942 | 2.6 C | +0.27 C |
| 1943 | 1.0 C | -1.36 C |
| 1944 | 2.6 C | +0.27 C |
| 1945 | 2.3 C | -0.07 C |
| 1946 | 2.7 C | +0.32 C |
| 1947 | 2.5 C | +0.14 C |
| 1948 | 3.3 C | +0.91 C |
| 1949 | 3.3 C | +0.96 C |
| 1950 | 1.4 C | -0.91 C |
| 1954 | 2.5 C | +0.12 C |
| 1957 | 2.9 C | +0.55 C |
| 1958 | 2.5 C | +0.20 C |
| 1959 | 2.2 C | -0.10 C |
| 1960 | 3.0 C | +0.62 C |
| 1961 | 3.3 C | +0.94 C |
| 1962 | 2.5 C | +0.18 C |
| 1963 | 2.6 C | +0.26 C |
| 1965 | 1.9 C | -0.45 C |
| 1966 | 3.1 C | +0.77 C |
The fitted trend in annual mean temperature here over 1911 to 1966 is 0.04 C (-0.10 to 0.19) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.3) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.04 C (-0.10 to 0.19) per decade | 0.1 F (-0.2 to 0.3) per decade | 1911 to 1966 | 47 | Not clearly different from zero |
| Mean daily maximum | -0.2 C (-0.3 to -0.1) per decade | -0.4 F (-0.6 to -0.1) per decade | 1911 to 1966 | 47 | Fall |
| Mean daily minimum | 0.3 C (0.1 to 0.5) per decade | 0.5 F (0.2 to 0.9) per decade | 1911 to 1966 | 47 | Rise |
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
1910 to 1967| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.9 C (102.0 F) | 1921 | 34.2 C (93.5 F) | 58 |
| Coldest night (TNn) | -46.7 C (-52.1 F) | 1914 | -40.0 C (-40.0 F) | 58 |
| Wettest day (Rx1day) | 112.3 mm (4.4 in) | 1960 | 41.9 mm (1.6 in) | 58 |
| Wettest five days (Rx5day) | 171.0 mm (6.7 in) | 1932 | 64.4 mm (2.5 in) | 58 |
| Longest dry spell (CDD) | 39 days | 1918 | 15 days | 58 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1910 | 1.1 C (34.0 F) |
| 1911 | 37.8 C (100.0 F) |
| 1912 | 35.0 C (95.0 F) |
| 1913 | 35.6 C (96.1 F) |
| 1914 | 35.0 C (95.0 F) |
| 1915 | 31.7 C (89.1 F) |
| 1916 | 38.3 C (100.9 F) |
| 1917 | 33.9 C (93.0 F) |
| 1918 | 34.4 C (93.9 F) |
| 1919 | 36.7 C (98.1 F) |
| 1920 | 31.7 C (89.1 F) |
| 1921 | 38.9 C (102.0 F) |
| 1922 | 36.1 C (97.0 F) |
| 1923 | 35.6 C (96.1 F) |
| 1924 | 32.8 C (91.0 F) |
| 1925 | 36.1 C (97.0 F) |
| 1926 | 32.8 C (91.0 F) |
| 1927 | 37.8 C (100.0 F) |
| 1928 | 32.2 C (90.0 F) |
| 1929 | 35.0 C (95.0 F) |
| 1930 | 32.2 C (90.0 F) |
| 1931 | 38.3 C (100.9 F) |
| 1932 | 31.7 C (89.1 F) |
| 1933 | 33.3 C (91.9 F) |
| 1934 | 33.9 C (93.0 F) |
| 1935 | 34.4 C (93.9 F) |
| 1936 | 38.3 C (100.9 F) |
| 1937 | 36.1 C (97.0 F) |
| 1938 | 36.1 C (97.0 F) |
| 1939 | 35.0 C (95.0 F) |
| 1940 | 32.8 C (91.0 F) |
| 1941 | 33.3 C (91.9 F) |
| 1942 | 35.0 C (95.0 F) |
| 1943 | 32.8 C (91.0 F) |
| 1944 | 35.0 C (95.0 F) |
| 1945 | 32.2 C (90.0 F) |
| 1946 | 32.2 C (90.0 F) |
| 1947 | 34.4 C (93.9 F) |
| 1948 | 34.4 C (93.9 F) |
| 1949 | 36.7 C (98.1 F) |
| 1950 | 31.1 C (88.0 F) |
| 1951 | 32.8 C (91.0 F) |
| 1952 | 31.7 C (89.1 F) |
| 1953 | 34.4 C (93.9 F) |
| 1954 | 31.1 C (88.0 F) |
| 1955 | 36.1 C (97.0 F) |
| 1956 | 33.3 C (91.9 F) |
| 1957 | 33.9 C (93.0 F) |
| 1958 | 31.7 C (89.1 F) |
| 1959 | 32.2 C (90.0 F) |
| 1960 | 31.1 C (88.0 F) |
| 1961 | 31.1 C (88.0 F) |
| 1962 | 34.4 C (93.9 F) |
| 1963 | 34.4 C (93.9 F) |
| 1964 | 33.9 C (93.0 F) |
| 1965 | 29.4 C (84.9 F) |
| 1966 | 35.6 C (96.1 F) |
| 1967 | 30.6 C (87.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1910 | -33.9 C (-29.0 F) |
| 1911 | -37.2 C (-35.0 F) |
| 1912 | -42.2 C (-44.0 F) |
| 1913 | -36.7 C (-34.1 F) |
| 1914 | -46.7 C (-52.1 F) |
| 1915 | -34.4 C (-29.9 F) |
| 1916 | -37.8 C (-36.0 F) |
| 1917 | -41.1 C (-42.0 F) |
| 1918 | -39.4 C (-38.9 F) |
| 1919 | -40.0 C (-40.0 F) |
| 1920 | -42.2 C (-44.0 F) |
| 1921 | -38.3 C (-36.9 F) |
| 1922 | -39.4 C (-38.9 F) |
| 1923 | -41.1 C (-42.0 F) |
| 1924 | -43.9 C (-47.0 F) |
| 1925 | -38.9 C (-38.0 F) |
| 1926 | -39.4 C (-38.9 F) |
| 1927 | -42.8 C (-45.0 F) |
| 1928 | -41.1 C (-42.0 F) |
| 1929 | -43.9 C (-47.0 F) |
| 1930 | -41.1 C (-42.0 F) |
| 1931 | -38.3 C (-36.9 F) |
| 1932 | -36.1 C (-33.0 F) |
| 1933 | -46.1 C (-51.0 F) |
| 1934 | -46.7 C (-52.1 F) |
| 1935 | -42.8 C (-45.0 F) |
| 1936 | -40.0 C (-40.0 F) |
| 1937 | -40.0 C (-40.0 F) |
| 1938 | -40.0 C (-40.0 F) |
| 1939 | -41.7 C (-43.1 F) |
| 1940 | -34.4 C (-29.9 F) |
| 1941 | -38.9 C (-38.0 F) |
| 1942 | -41.1 C (-42.0 F) |
| 1943 | -45.0 C (-49.0 F) |
| 1944 | -37.2 C (-35.0 F) |
| 1945 | -42.8 C (-45.0 F) |
| 1946 | -44.4 C (-47.9 F) |
| 1947 | -42.2 C (-44.0 F) |
| 1948 | -42.2 C (-44.0 F) |
| 1949 | -36.7 C (-34.1 F) |
| 1950 | -42.2 C (-44.0 F) |
| 1951 | -43.9 C (-47.0 F) |
| 1952 | -38.9 C (-38.0 F) |
| 1953 | -37.2 C (-35.0 F) |
| 1954 | -40.0 C (-40.0 F) |
| 1955 | -42.2 C (-44.0 F) |
| 1956 | -36.7 C (-34.1 F) |
| 1957 | -42.8 C (-45.0 F) |
| 1958 | -37.2 C (-35.0 F) |
| 1959 | -38.3 C (-36.9 F) |
| 1960 | -38.9 C (-38.0 F) |
| 1961 | -37.2 C (-35.0 F) |
| 1962 | -43.3 C (-45.9 F) |
| 1963 | -39.4 C (-38.9 F) |
| 1964 | -35.6 C (-32.1 F) |
| 1965 | -42.8 C (-45.0 F) |
| 1966 | -36.7 C (-34.1 F) |
| 1967 | -28.9 C (-20.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1910 | 16.3 mm (0.6 in) |
| 1911 | 35.3 mm (1.4 in) |
| 1912 | 35.6 mm (1.4 in) |
| 1913 | 22.9 mm (0.9 in) |
| 1914 | 33.3 mm (1.3 in) |
| 1915 | 33.5 mm (1.3 in) |
| 1916 | 33.0 mm (1.3 in) |
| 1917 | 48.3 mm (1.9 in) |
| 1918 | 48.3 mm (1.9 in) |
| 1919 | 43.2 mm (1.7 in) |
| 1920 | 43.2 mm (1.7 in) |
| 1921 | 35.8 mm (1.4 in) |
| 1922 | 33.5 mm (1.3 in) |
| 1923 | 33.3 mm (1.3 in) |
| 1924 | 27.9 mm (1.1 in) |
| 1925 | 39.9 mm (1.6 in) |
| 1926 | 30.5 mm (1.2 in) |
| 1927 | 45.7 mm (1.8 in) |
| 1928 | 41.4 mm (1.6 in) |
| 1929 | 47.0 mm (1.9 in) |
| 1930 | 85.9 mm (3.4 in) |
| 1931 | 46.2 mm (1.8 in) |
| 1932 | 107.2 mm (4.2 in) |
| 1933 | 32.3 mm (1.3 in) |
| 1934 | 49.0 mm (1.9 in) |
| 1935 | 30.5 mm (1.2 in) |
| 1936 | 33.8 mm (1.3 in) |
| 1937 | 69.9 mm (2.8 in) |
| 1938 | 32.8 mm (1.3 in) |
| 1939 | 23.9 mm (0.9 in) |
| 1940 | 90.4 mm (3.6 in) |
| 1941 | 66.8 mm (2.6 in) |
| 1942 | 28.7 mm (1.1 in) |
| 1943 | 46.0 mm (1.8 in) |
| 1944 | 42.4 mm (1.7 in) |
| 1945 | 53.1 mm (2.1 in) |
| 1946 | 34.5 mm (1.4 in) |
| 1947 | 42.9 mm (1.7 in) |
| 1948 | 30.0 mm (1.2 in) |
| 1949 | 34.5 mm (1.4 in) |
| 1950 | 26.4 mm (1.0 in) |
| 1951 | 40.4 mm (1.6 in) |
| 1952 | 52.3 mm (2.1 in) |
| 1953 | 25.4 mm (1.0 in) |
| 1954 | 53.6 mm (2.1 in) |
| 1955 | 50.8 mm (2.0 in) |
| 1956 | 40.1 mm (1.6 in) |
| 1957 | 69.6 mm (2.7 in) |
| 1958 | 47.5 mm (1.9 in) |
| 1959 | 49.8 mm (2.0 in) |
| 1960 | 112.3 mm (4.4 in) |
| 1961 | 56.6 mm (2.2 in) |
| 1962 | 36.6 mm (1.4 in) |
| 1963 | 55.9 mm (2.2 in) |
| 1964 | 33.5 mm (1.3 in) |
| 1965 | 65.3 mm (2.6 in) |
| 1966 | 60.2 mm (2.4 in) |
| 1967 | 50.8 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1910 | 55.0 mm (2.2 in) |
| 1911 | 56.4 mm (2.2 in) |
| 1912 | 65.6 mm (2.6 in) |
| 1913 | 51.6 mm (2.0 in) |
| 1914 | 42.7 mm (1.7 in) |
| 1915 | 63.2 mm (2.5 in) |
| 1916 | 36.6 mm (1.4 in) |
| 1917 | 61.0 mm (2.4 in) |
| 1918 | 84.9 mm (3.3 in) |
| 1919 | 67.5 mm (2.7 in) |
| 1920 | 47.0 mm (1.9 in) |
| 1921 | 55.4 mm (2.2 in) |
| 1922 | 61.9 mm (2.4 in) |
| 1923 | 56.4 mm (2.2 in) |
| 1924 | 54.8 mm (2.2 in) |
| 1925 | 72.7 mm (2.9 in) |
| 1926 | 73.0 mm (2.9 in) |
| 1927 | 66.5 mm (2.6 in) |
| 1928 | 78.0 mm (3.1 in) |
| 1929 | 102.2 mm (4.0 in) |
| 1930 | 127.1 mm (5.0 in) |
| 1931 | 60.8 mm (2.4 in) |
| 1932 | 171.0 mm (6.7 in) |
| 1933 | 49.8 mm (2.0 in) |
| 1934 | 56.1 mm (2.2 in) |
| 1935 | 51.3 mm (2.0 in) |
| 1936 | 51.5 mm (2.0 in) |
| 1937 | 110.5 mm (4.4 in) |
| 1938 | 45.4 mm (1.8 in) |
| 1939 | 48.1 mm (1.9 in) |
| 1940 | 142.9 mm (5.6 in) |
| 1941 | 97.0 mm (3.8 in) |
| 1942 | 54.3 mm (2.1 in) |
| 1943 | 83.4 mm (3.3 in) |
| 1944 | 61.8 mm (2.4 in) |
| 1945 | 92.5 mm (3.6 in) |
| 1946 | 56.3 mm (2.2 in) |
| 1947 | 76.9 mm (3.0 in) |
| 1948 | 57.0 mm (2.2 in) |
| 1949 | 67.4 mm (2.7 in) |
| 1950 | 40.4 mm (1.6 in) |
| 1951 | 61.4 mm (2.4 in) |
| 1952 | 70.4 mm (2.8 in) |
| 1953 | 50.1 mm (2.0 in) |
| 1954 | 75.0 mm (3.0 in) |
| 1955 | 77.5 mm (3.1 in) |
| 1956 | 75.6 mm (3.0 in) |
| 1957 | 129.1 mm (5.1 in) |
| 1958 | 61.0 mm (2.4 in) |
| 1959 | 94.5 mm (3.7 in) |
| 1960 | 167.4 mm (6.6 in) |
| 1961 | 104.9 mm (4.1 in) |
| 1962 | 58.2 mm (2.3 in) |
| 1963 | 73.9 mm (2.9 in) |
| 1964 | 49.8 mm (2.0 in) |
| 1965 | 97.0 mm (3.8 in) |
| 1966 | 70.7 mm (2.8 in) |
| 1967 | 94.4 mm (3.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1910 | 17 days |
| 1911 | 17 days |
| 1912 | 33 days |
| 1913 | 16 days |
| 1914 | 26 days |
| 1915 | 23 days |
| 1916 | 32 days |
| 1917 | 22 days |
| 1918 | 39 days |
| 1919 | 13 days |
| 1920 | 19 days |
| 1921 | 12 days |
| 1922 | 19 days |
| 1923 | 14 days |
| 1924 | 21 days |
| 1925 | 14 days |
| 1926 | 22 days |
| 1927 | 15 days |
| 1928 | 11 days |
| 1929 | 16 days |
| 1930 | 10 days |
| 1931 | 14 days |
| 1932 | 13 days |
| 1933 | 12 days |
| 1934 | 9 days |
| 1935 | 25 days |
| 1936 | 11 days |
| 1937 | 17 days |
| 1938 | 11 days |
| 1939 | 20 days |
| 1940 | 15 days |
| 1941 | 18 days |
| 1942 | 15 days |
| 1943 | 12 days |
| 1944 | 13 days |
| 1945 | 13 days |
| 1946 | 12 days |
| 1947 | 17 days |
| 1948 | 15 days |
| 1949 | 14 days |
| 1950 | 13 days |
| 1951 | 11 days |
| 1952 | 21 days |
| 1953 | 19 days |
| 1954 | 12 days |
| 1955 | 11 days |
| 1956 | 10 days |
| 1957 | 16 days |
| 1958 | 18 days |
| 1959 | 14 days |
| 1960 | 18 days |
| 1961 | 17 days |
| 1962 | 12 days |
| 1963 | 15 days |
| 1964 | 9 days |
| 1965 | 19 days |
| 1966 | 14 days |
| 1967 | 13 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
47 years with a frostAcross 47 years with a frost, the median last spring frost at Montreal River falls on 9 June and the median first autumn frost on 2 September, which leaves a median of 81 days between them.
Fitted over all years, the growing season changes by +6.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1931 to 1966) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 9 June | n/a | 8 June | n/a | -1.5 days per decade |
| First autumn frost | 2 September | n/a | 5 September | n/a | +4.7 days per decade |
| Growing days | 81 days | n/a | 87 days | n/a | +6.2 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
56 years, 1911 to 1966A day with at least 40.8 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 122.7 mm (4.8 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 40.8 mm (1.6 in) | |
| 5 years | 55.9 mm (2.2 in) | |
| 10 years | 68.2 mm (2.7 in) | |
| 25 years | 86.9 mm (3.4 in) | |
| 50 years | 103.5 mm (4.1 in) | |
| 100 years | 122.7 mm (4.8 in) | Longer than the 56 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, 56 years of values from 1911 to 1966.
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: 112.3 mm (4.4 in) in 1960; 107.2 mm (4.2 in) in 1932; 90.4 mm (3.6 in) in 1940.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Montreal River, at 1927 and 1958. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1927 ran 0.9 C (1.7 F) lower than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1958 ran 0.6 C (1.0 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1927 | -0.9 | -1.7 | likely | 5 |
| 1958 | +0.6 | +1.0 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
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).