Thetford Mines Weather Records (CA007028440)
Record envelope, standing records and threshold days for Thetford Mines (CA007028440), Quebec, Canada, with 44 years of record.
Key Facts for Thetford Mines
- Thetford Mines (CA007028440) is a weather station in Quebec, Canada at 46.07 latitude and -71.32 longitude, 311 m (1,020 ft) above sea level.
- The station reports from 1922 to 1965, 44 years of record.
- 1,464 records set at Thetford Mines still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Thetford Mines set a daily record precipitation of 29.7 mm (1.2 in) on 17 November 1965.
About the Station
- Location: Quebec, Canada, 46.07 latitude, -71.32 longitude.
- Elevation: 311 m (1,020 ft).
- Period of record: 1922 to 1965, 44 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 | 12.2 C (54.0 F) | -41.1 C (-42.0 F) | n/a | n/a |
| Feb | 12.2 C (54.0 F) | -38.3 C (-36.9 F) | n/a | n/a |
| Mar | 22.2 C (72.0 F) | -35.6 C (-32.1 F) | n/a | n/a |
| Apr | 28.3 C (82.9 F) | -20.6 C (-5.1 F) | n/a | n/a |
| May | 33.9 C (93.0 F) | -10.0 C (14.0 F) | n/a | n/a |
| Jun | 35.6 C (96.1 F) | -5.6 C (21.9 F) | n/a | n/a |
| Jul | 36.7 C (98.1 F) | -1.1 C (30.0 F) | n/a | n/a |
| Aug | 33.9 C (93.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Sep | 31.1 C (88.0 F) | -7.2 C (19.0 F) | n/a | n/a |
| Oct | 27.2 C (81.0 F) | -12.8 C (9.0 F) | n/a | n/a |
| Nov | 21.1 C (70.0 F) | -30.6 C (-23.1 F) | n/a | n/a |
| Dec | 16.7 C (62.1 F) | -38.9 C (-38.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1922 | 42 |
| 1923 | 70 |
| 1924 | 29 |
| 1925 | 24 |
| 1926 | 29 |
| 1927 | 33 |
| 1928 | 26 |
| 1929 | 53 |
| 1930 | 36 |
| 1931 | 32 |
| 1932 | 30 |
| 1933 | 50 |
| 1934 | 57 |
| 1935 | 34 |
| 1936 | 66 |
| 1937 | 28 |
| 1938 | 35 |
| 1939 | 35 |
| 1940 | 33 |
| 1941 | 31 |
| 1942 | 30 |
| 1943 | 39 |
| 1944 | 31 |
| 1945 | 39 |
| 1946 | 36 |
| 1947 | 36 |
| 1948 | 30 |
| 1949 | 41 |
| 1950 | 30 |
| 1951 | 31 |
| 1952 | 14 |
| 1953 | 43 |
| 1954 | 34 |
| 1955 | 18 |
| 1956 | 22 |
| 1957 | 37 |
| 1958 | 17 |
| 1959 | 37 |
| 1960 | 16 |
| 1961 | 21 |
| 1962 | 22 |
| 1963 | 28 |
| 1964 | 27 |
| 1965 | 12 |
Wettest Day of Each Month
Jun: 100.3 mm (3.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 61.0 mm (2.4 in) | 16 January 1936 |
| Feb | 58.4 mm (2.3 in) | 14 February 1944 |
| Mar | 80.0 mm (3.1 in) | 29 March 1960 |
| Apr | 48.0 mm (1.9 in) | 6 April 1936 |
| May | 40.9 mm (1.6 in) | 27 May 1933 |
| Jun | 100.3 mm (3.9 in) | 14 June 1942 |
| Jul | 62.5 mm (2.5 in) | 29 July 1957 |
| Aug | 91.7 mm (3.6 in) | 27 August 1950 |
| Sep | 90.4 mm (3.6 in) | 12 September 1963 |
| Oct | 68.6 mm (2.7 in) | 24 October 1923 |
| Nov | 59.2 mm (2.3 in) | 4 November 1950 |
| Dec | 43.2 mm (1.7 in) | 20 December 1951 |
Period of Record Coverage
1922 to 1965| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1922 | 317 | 87% | No |
| 1923 | 365 | 100% | Yes |
| 1924 | 362 | 99% | Yes |
| 1925 | 242 | 66% | No |
| 1926 | 342 | 94% | Yes |
| 1927 | 340 | 93% | Yes |
| 1928 | 359 | 98% | Yes |
| 1929 | 365 | 100% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 363 | 99% | Yes |
| 1932 | 366 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 364 | 99% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 364 | 100% | Yes |
| 1947 | 334 | 92% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 363 | 99% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 362 | 99% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 304 | 83% | No |
| 1959 | 365 | 100% | Yes |
| 1960 | 365 | 100% | Yes |
| 1961 | 361 | 99% | Yes |
| 1962 | 323 | 88% | No |
| 1963 | 347 | 95% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 198 | 54% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 17 November 1965 | Thetford Mines, CA | daily rain | 29.7 mm (1.2 in) | 17.0 mm (0.7 in) | 24 years | 31 of 100 (Routine) |
| 17 November 1965 | Thetford Mines, CA | daily snowfall | 14.0 cm (5.5 in) | 1.3 cm (0.5 in) | 24 years | 13 of 100 (Routine) |
| 10 November 1965 | Thetford Mines, CA | daily low min (Tie) | -12.2 C (10.0 F) | tie | 42 years | 4 of 100 (Routine) |
| 21 October 1965 | Thetford Mines, CA | daily snowfall | 4.6 cm (1.8 in) | 0.8 cm (0.3 in) | 24 years | 12 of 100 (Routine) |
| 15 October 1965 | Thetford Mines, CA | daily snowfall | 4.6 cm (1.8 in) | 3.3 cm (1.3 in) | 4 years | 11 of 100 (Routine) |
| 8 October 1965 | Thetford Mines, CA | daily rain | 21.3 mm (0.8 in) | 3.3 mm (0.13 in) | 32 years | 16 of 100 (Routine) |
| 6 October 1965 | Thetford Mines, CA | daily low max | 2.8 C (37.0 F) | 1.6 C (2.9 F) | 12 years | 9 of 100 (Routine) |
| 5 October 1965 | Thetford Mines, CA | daily low max | 0.6 C (33.1 F) | 6.1 C (11.0 F) | 42 years | 25 of 100 (Routine) |
| 4 October 1965 | Thetford Mines, CA | daily low max | 0.0 C (32.0 F) | 6.7 C (12.1 F) | 36 years | 24 of 100 (Routine) |
| 4 October 1965 | Thetford Mines, CA | daily snowfall | 0.8 cm (0.3 in) | 0.8 cm (0.3 in) | 43 years | 17 of 100 (Routine) |
| 3 October 1965 | Thetford Mines, CA | daily snowfall | 2.5 cm (1.0 in) | 2.5 cm (1.0 in) | 43 years | 20 of 100 (Routine) |
| 30 September 1965 | Thetford Mines, CA | daily low min | -4.4 C (24.1 F) | 0.5 C (0.9 F) | 34 years | 14 of 100 (Routine) |
| 27 September 1965 | Thetford Mines, CA | daily low max (Tie) | 6.1 C (43.0 F) | tie | 26 years | 2 of 100 (Routine) |
| 23 September 1965 | Thetford Mines, CA | daily rain | 21.3 mm (0.8 in) | 6.1 mm (0.24 in) | 38 years | 20 of 100 (Routine) |
| 23 September 1965 | Thetford Mines, CA | daily high min | 17.8 C (64.0 F) | 4.5 C (8.1 F) | 19 years | 17 of 100 (Routine) |
| 23 September 1965 | Thetford Mines, CA | daily high max | 29.4 C (84.9 F) | 2.2 C (4.0 F) | 28 years | 16 of 100 (Routine) |
| 22 September 1965 | Thetford Mines, CA | daily high max | 30.6 C (87.1 F) | 3.4 C (6.1 F) | 14 years | 14 of 100 (Routine) |
| 22 September 1965 | Thetford Mines, CA | daily high min | 20.0 C (68.0 F) | 3.3 C (5.9 F) | 8 years | 12 of 100 (Routine) |
| 21 September 1965 | Thetford Mines, CA | daily high min | 20.0 C (68.0 F) | 3.9 C (7.0 F) | 20 years | 17 of 100 (Routine) |
| 21 September 1965 | Thetford Mines, CA | daily high max | 27.2 C (81.0 F) | 1.1 C (2.0 F) | 19 years | 11 of 100 (Routine) |
Climate Trend
37 complete years, 1923 to 1964| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1923 | 1.8 C | -1.76 C |
| 1924 | 2.2 C | -1.35 C |
| 1927 | 3.9 C | +0.33 C |
| 1928 | 3.6 C | +0.03 C |
| 1929 | 3.4 C | -0.17 C |
| 1930 | 4.0 C | +0.51 C |
| 1931 | 4.6 C | +1.03 C |
| 1932 | 3.1 C | -0.39 C |
| 1933 | 2.7 C | -0.88 C |
| 1934 | 1.8 C | -1.70 C |
| 1935 | 2.0 C | -1.52 C |
| 1936 | 1.8 C | -1.73 C |
| 1937 | 3.6 C | +0.05 C |
| 1938 | 3.6 C | +0.10 C |
| 1939 | 2.7 C | -0.82 C |
| 1940 | 2.7 C | -0.85 C |
| 1941 | 3.9 C | +0.35 C |
| 1942 | 3.7 C | +0.16 C |
| 1943 | 2.4 C | -1.15 C |
| 1944 | 3.6 C | +0.03 C |
| 1945 | 4.2 C | +0.70 C |
| 1946 | 3.9 C | +0.35 C |
| 1948 | 4.1 C | +0.56 C |
| 1949 | 5.0 C | +1.42 C |
| 1950 | 3.6 C | +0.04 C |
| 1951 | 4.1 C | +0.60 C |
| 1952 | 4.3 C | +0.75 C |
| 1953 | 5.1 C | +1.57 C |
| 1954 | 3.3 C | -0.26 C |
| 1955 | 4.1 C | +0.53 C |
| 1956 | 3.4 C | -0.13 C |
| 1957 | 4.4 C | +0.82 C |
| 1959 | 4.1 C | +0.53 C |
| 1960 | 4.1 C | +0.60 C |
| 1961 | 4.4 C | +0.84 C |
| 1963 | 3.5 C | -0.02 C |
| 1964 | 4.3 C | +0.78 C |
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1923 to 1964. In Fahrenheit: 0.7 F (0.3 to 1.1) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.4 C (0.2 to 0.6) per decade | 0.7 F (0.3 to 1.1) per decade | 1923 to 1964 | 37 | Rise |
| Mean daily maximum | -0.1 C (-0.3 to 0.2) per decade | -0.1 F (-0.6 to 0.4) per decade | 1923 to 1964 | 37 | Not clearly different from zero |
| Mean daily minimum | 0.9 C (0.6 to 1.1) per decade | 1.6 F (1.1 to 2.0) per decade | 1923 to 1964 | 37 | 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
1922 to 1965| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.7 C (98.1 F) | 1929 | 31.1 C (88.0 F) | 44 |
| Coldest night (TNn) | -41.1 C (-42.0 F) | 1925 | -33.0 C (-27.5 F) | 44 |
| Wettest day (Rx1day) | 100.3 mm (3.9 in) | 1942 | 51.1 mm (2.0 in) | 44 |
| Wettest five days (Rx5day) | 168.2 mm (6.6 in) | 1942 | 85.3 mm (3.4 in) | 44 |
| Longest dry spell (CDD) | 32 days | 1931 | 14 days | 44 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1922 | 31.1 C (88.0 F) |
| 1923 | 31.1 C (88.0 F) |
| 1924 | 29.4 C (84.9 F) |
| 1925 | 29.4 C (84.9 F) |
| 1926 | 29.4 C (84.9 F) |
| 1927 | 29.4 C (84.9 F) |
| 1928 | 33.3 C (91.9 F) |
| 1929 | 36.7 C (98.1 F) |
| 1930 | 33.3 C (91.9 F) |
| 1931 | 32.8 C (91.0 F) |
| 1932 | 30.6 C (87.1 F) |
| 1933 | 33.3 C (91.9 F) |
| 1934 | 30.6 C (87.1 F) |
| 1935 | 33.3 C (91.9 F) |
| 1936 | 30.0 C (86.0 F) |
| 1937 | 33.3 C (91.9 F) |
| 1938 | 33.3 C (91.9 F) |
| 1939 | 30.6 C (87.1 F) |
| 1940 | 30.0 C (86.0 F) |
| 1941 | 31.7 C (89.1 F) |
| 1942 | 30.6 C (87.1 F) |
| 1943 | 31.1 C (88.0 F) |
| 1944 | 33.9 C (93.0 F) |
| 1945 | 30.0 C (86.0 F) |
| 1946 | 32.8 C (91.0 F) |
| 1947 | 33.3 C (91.9 F) |
| 1948 | 31.1 C (88.0 F) |
| 1949 | 32.2 C (90.0 F) |
| 1950 | 29.4 C (84.9 F) |
| 1951 | 30.0 C (86.0 F) |
| 1952 | 35.0 C (95.0 F) |
| 1953 | 33.9 C (93.0 F) |
| 1954 | 27.8 C (82.0 F) |
| 1955 | 33.9 C (93.0 F) |
| 1956 | 31.1 C (88.0 F) |
| 1957 | 30.6 C (87.1 F) |
| 1958 | 28.3 C (82.9 F) |
| 1959 | 32.8 C (91.0 F) |
| 1960 | 30.6 C (87.1 F) |
| 1961 | 30.0 C (86.0 F) |
| 1962 | 30.6 C (87.1 F) |
| 1963 | 31.7 C (89.1 F) |
| 1964 | 31.7 C (89.1 F) |
| 1965 | 30.6 C (87.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1922 | -37.2 C (-35.0 F) |
| 1923 | -38.3 C (-36.9 F) |
| 1924 | -37.8 C (-36.0 F) |
| 1925 | -41.1 C (-42.0 F) |
| 1926 | -32.8 C (-27.0 F) |
| 1927 | -33.3 C (-27.9 F) |
| 1928 | -31.7 C (-25.1 F) |
| 1929 | -33.9 C (-29.0 F) |
| 1930 | -35.0 C (-31.0 F) |
| 1931 | -31.7 C (-25.1 F) |
| 1932 | -35.6 C (-32.1 F) |
| 1933 | -38.9 C (-38.0 F) |
| 1934 | -38.3 C (-36.9 F) |
| 1935 | -36.7 C (-34.1 F) |
| 1936 | -35.0 C (-31.0 F) |
| 1937 | -29.4 C (-20.9 F) |
| 1938 | -35.6 C (-32.1 F) |
| 1939 | -33.9 C (-29.0 F) |
| 1940 | -31.7 C (-25.1 F) |
| 1941 | -31.7 C (-25.1 F) |
| 1942 | -32.8 C (-27.0 F) |
| 1943 | -37.8 C (-36.0 F) |
| 1944 | -33.3 C (-27.9 F) |
| 1945 | -31.7 C (-25.1 F) |
| 1946 | -31.1 C (-24.0 F) |
| 1947 | -27.8 C (-18.0 F) |
| 1948 | -31.7 C (-25.1 F) |
| 1949 | -26.7 C (-16.1 F) |
| 1950 | -29.4 C (-20.9 F) |
| 1951 | -35.0 C (-31.0 F) |
| 1952 | -31.1 C (-24.0 F) |
| 1953 | -27.2 C (-17.0 F) |
| 1954 | -32.2 C (-26.0 F) |
| 1955 | -34.4 C (-29.9 F) |
| 1956 | -27.8 C (-18.0 F) |
| 1957 | -35.6 C (-32.1 F) |
| 1958 | -30.6 C (-23.1 F) |
| 1959 | -30.6 C (-23.1 F) |
| 1960 | -34.4 C (-29.9 F) |
| 1961 | -29.4 C (-20.9 F) |
| 1962 | -36.7 C (-34.1 F) |
| 1963 | -31.7 C (-25.1 F) |
| 1964 | -31.7 C (-25.1 F) |
| 1965 | -33.3 C (-27.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1922 | 63.5 mm (2.5 in) |
| 1923 | 68.6 mm (2.7 in) |
| 1924 | 56.1 mm (2.2 in) |
| 1925 | 45.2 mm (1.8 in) |
| 1926 | 58.4 mm (2.3 in) |
| 1927 | 30.5 mm (1.2 in) |
| 1928 | 38.1 mm (1.5 in) |
| 1929 | 36.8 mm (1.4 in) |
| 1930 | 39.6 mm (1.6 in) |
| 1931 | 38.6 mm (1.5 in) |
| 1932 | 65.0 mm (2.6 in) |
| 1933 | 43.4 mm (1.7 in) |
| 1934 | 38.4 mm (1.5 in) |
| 1935 | 47.0 mm (1.9 in) |
| 1936 | 61.0 mm (2.4 in) |
| 1937 | 51.1 mm (2.0 in) |
| 1938 | 38.1 mm (1.5 in) |
| 1939 | 79.5 mm (3.1 in) |
| 1940 | 44.2 mm (1.7 in) |
| 1941 | 43.2 mm (1.7 in) |
| 1942 | 100.3 mm (3.9 in) |
| 1943 | 37.3 mm (1.5 in) |
| 1944 | 58.4 mm (2.3 in) |
| 1945 | 51.1 mm (2.0 in) |
| 1946 | 64.3 mm (2.5 in) |
| 1947 | 40.6 mm (1.6 in) |
| 1948 | 39.9 mm (1.6 in) |
| 1949 | 49.0 mm (1.9 in) |
| 1950 | 91.7 mm (3.6 in) |
| 1951 | 62.2 mm (2.4 in) |
| 1952 | 85.1 mm (3.4 in) |
| 1953 | 60.2 mm (2.4 in) |
| 1954 | 57.7 mm (2.3 in) |
| 1955 | 57.2 mm (2.3 in) |
| 1956 | 51.1 mm (2.0 in) |
| 1957 | 62.5 mm (2.5 in) |
| 1958 | 35.6 mm (1.4 in) |
| 1959 | 61.0 mm (2.4 in) |
| 1960 | 86.1 mm (3.4 in) |
| 1961 | 63.5 mm (2.5 in) |
| 1962 | 40.6 mm (1.6 in) |
| 1963 | 90.4 mm (3.6 in) |
| 1964 | 36.1 mm (1.4 in) |
| 1965 | 34.0 mm (1.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1922 | 118.1 mm (4.6 in) |
| 1923 | 103.4 mm (4.1 in) |
| 1924 | 97.7 mm (3.8 in) |
| 1925 | 48.5 mm (1.9 in) |
| 1926 | 59.4 mm (2.3 in) |
| 1927 | 44.5 mm (1.8 in) |
| 1928 | 76.2 mm (3.0 in) |
| 1929 | 64.5 mm (2.5 in) |
| 1930 | 65.8 mm (2.6 in) |
| 1931 | 46.7 mm (1.8 in) |
| 1932 | 95.7 mm (3.8 in) |
| 1933 | 86.6 mm (3.4 in) |
| 1934 | 88.5 mm (3.5 in) |
| 1935 | 77.4 mm (3.0 in) |
| 1936 | 75.0 mm (3.0 in) |
| 1937 | 105.4 mm (4.1 in) |
| 1938 | 56.7 mm (2.2 in) |
| 1939 | 98.6 mm (3.9 in) |
| 1940 | 70.3 mm (2.8 in) |
| 1941 | 73.9 mm (2.9 in) |
| 1942 | 168.2 mm (6.6 in) |
| 1943 | 73.8 mm (2.9 in) |
| 1944 | 89.4 mm (3.5 in) |
| 1945 | 89.0 mm (3.5 in) |
| 1946 | 125.6 mm (4.9 in) |
| 1947 | 75.5 mm (3.0 in) |
| 1948 | 52.6 mm (2.1 in) |
| 1949 | 58.5 mm (2.3 in) |
| 1950 | 145.8 mm (5.7 in) |
| 1951 | 88.1 mm (3.5 in) |
| 1952 | 103.6 mm (4.1 in) |
| 1953 | 86.9 mm (3.4 in) |
| 1954 | 123.9 mm (4.9 in) |
| 1955 | 83.9 mm (3.3 in) |
| 1956 | 89.5 mm (3.5 in) |
| 1957 | 66.1 mm (2.6 in) |
| 1958 | 55.9 mm (2.2 in) |
| 1959 | 117.1 mm (4.6 in) |
| 1960 | 102.9 mm (4.1 in) |
| 1961 | 112.5 mm (4.4 in) |
| 1962 | 77.5 mm (3.1 in) |
| 1963 | 95.7 mm (3.8 in) |
| 1964 | 56.2 mm (2.2 in) |
| 1965 | 80.4 mm (3.2 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1922 | 12 days |
| 1923 | 12 days |
| 1924 | 14 days |
| 1925 | 16 days |
| 1926 | 14 days |
| 1927 | 31 days |
| 1928 | 14 days |
| 1929 | 15 days |
| 1930 | 17 days |
| 1931 | 32 days |
| 1932 | 16 days |
| 1933 | 12 days |
| 1934 | 17 days |
| 1935 | 13 days |
| 1936 | 13 days |
| 1937 | 12 days |
| 1938 | 14 days |
| 1939 | 21 days |
| 1940 | 12 days |
| 1941 | 13 days |
| 1942 | 13 days |
| 1943 | 10 days |
| 1944 | 16 days |
| 1945 | 11 days |
| 1946 | 10 days |
| 1947 | 18 days |
| 1948 | 16 days |
| 1949 | 14 days |
| 1950 | 17 days |
| 1951 | 14 days |
| 1952 | 13 days |
| 1953 | 17 days |
| 1954 | 10 days |
| 1955 | 17 days |
| 1956 | 17 days |
| 1957 | 15 days |
| 1958 | 9 days |
| 1959 | 18 days |
| 1960 | 9 days |
| 1961 | 10 days |
| 1962 | 16 days |
| 1963 | 17 days |
| 1964 | 13 days |
| 1965 | 8 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
37 years with a frostAcross 37 years with a frost, the median last spring frost at Thetford Mines falls on 2 June and the median first autumn frost on 11 September, which leaves a median of 103 days between them.
Fitted over all years, the growing season changes by +13.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1932 to 1964) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 2 June | n/a | 1 June | n/a | -5.5 days per decade |
| First autumn frost | 11 September | n/a | 13 September | n/a | +7.7 days per decade |
| Growing days | 103 days | n/a | 105 days | n/a | +13.2 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
36 years, 1923 to 1964A day with at least 53.8 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 117.2 mm (4.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 53.8 mm (2.1 in) | |
| 5 years | 69.7 mm (2.7 in) | |
| 10 years | 80.7 mm (3.2 in) | |
| 25 years | 95.0 mm (3.7 in) | |
| 50 years | 106.0 mm (4.2 in) | Longer than the 36 years of record |
| 100 years | 117.2 mm (4.6 in) | Longer than the 36 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, 36 years of values from 1923 to 1964.
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: 100.3 mm (3.9 in) in 1942; 91.7 mm (3.6 in) in 1950; 90.4 mm (3.6 in) in 1963.
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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).