Slave Lake Weather Records (CA003066000)
Record envelope, standing records and threshold days for Slave Lake (CA003066000), Alberta, Canada, with 41 years of record.
Key Facts for Slave Lake
- Slave Lake (CA003066000) is a weather station in Alberta, Canada at 55.28 latitude and -114.77 longitude, 585 m (1,919 ft) above sea level.
- The station reports from 1922 to 1962, 41 years of record.
- 1,464 records set at Slave Lake still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Slave Lake set a daily record high minimum temperature of 12.8 C (55.0 F) on 24 August 1962.
About the Station
- Location: Alberta, Canada, 55.28 latitude, -114.77 longitude.
- Elevation: 585 m (1,919 ft).
- Period of record: 1922 to 1962, 41 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 | 12.8 C (55.0 F) | -47.2 C (-53.0 F) | n/a | n/a |
| Feb | 17.2 C (63.0 F) | -48.3 C (-54.9 F) | n/a | n/a |
| Mar | 18.3 C (64.9 F) | -40.6 C (-41.1 F) | n/a | n/a |
| Apr | 26.7 C (80.1 F) | -36.1 C (-33.0 F) | n/a | n/a |
| May | 33.3 C (91.9 F) | -11.1 C (12.0 F) | n/a | n/a |
| Jun | 37.8 C (100.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Jul | 34.4 C (93.9 F) | -1.1 C (30.0 F) | n/a | n/a |
| Aug | 33.9 C (93.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Sep | 30.0 C (86.0 F) | -13.3 C (8.1 F) | n/a | n/a |
| Oct | 27.8 C (82.0 F) | -30.0 C (-22.0 F) | n/a | n/a |
| Nov | 19.4 C (66.9 F) | -35.6 C (-32.1 F) | n/a | n/a |
| Dec | 13.3 C (55.9 F) | -44.4 C (-47.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1922 | 9 |
| 1923 | 17 |
| 1924 | 13 |
| 1925 | 41 |
| 1926 | 17 |
| 1927 | 42 |
| 1928 | 35 |
| 1929 | 39 |
| 1930 | 38 |
| 1931 | 40 |
| 1932 | 31 |
| 1933 | 27 |
| 1934 | 46 |
| 1935 | 37 |
| 1936 | 69 |
| 1937 | 26 |
| 1938 | 36 |
| 1939 | 42 |
| 1940 | 29 |
| 1941 | 36 |
| 1942 | 53 |
| 1943 | 35 |
| 1944 | 41 |
| 1945 | 40 |
| 1946 | 27 |
| 1947 | 41 |
| 1948 | 28 |
| 1949 | 43 |
| 1950 | 56 |
| 1951 | 49 |
| 1952 | 22 |
| 1953 | 37 |
| 1954 | 74 |
| 1955 | 50 |
| 1956 | 44 |
| 1957 | 30 |
| 1958 | 11 |
| 1959 | 37 |
| 1960 | 14 |
| 1961 | 44 |
| 1962 | 18 |
Wettest Day of Each Month
Jun: 75.7 mm (3.0 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 30.5 mm (1.2 in) | 25 January 1935 |
| Feb | 25.7 mm (1.0 in) | 11 February 1961 |
| Mar | 38.1 mm (1.5 in) | 20 March 1939 |
| Apr | 36.8 mm (1.4 in) | 17 April 1925 |
| May | 45.2 mm (1.8 in) | 1 May 1951 |
| Jun | 75.7 mm (3.0 in) | 27 June 1938 |
| Jul | 47.2 mm (1.9 in) | 27 July 1933 |
| Aug | 48.8 mm (1.9 in) | 31 August 1954 |
| Sep | 41.1 mm (1.6 in) | 6 September 1931 |
| Oct | 30.5 mm (1.2 in) | 5 October 1939 |
| Nov | 19.3 mm (0.8 in) | 13 November 1933 |
| Dec | 27.9 mm (1.1 in) | 30 December 1953 |
Period of Record Coverage
1922 to 1962| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1922 | 151 | 41% | No |
| 1923 | 181 | 50% | No |
| 1924 | 87 | 24% | No |
| 1925 | 365 | 100% | Yes |
| 1926 | 181 | 50% | No |
| 1927 | 327 | 90% | No |
| 1928 | 362 | 99% | Yes |
| 1929 | 365 | 100% | Yes |
| 1930 | 364 | 100% | Yes |
| 1931 | 365 | 100% | 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 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 361 | 99% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 324 | 89% | No |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 358 | 98% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 273 | 75% | No |
| 1958 | 253 | 69% | No |
| 1959 | 351 | 96% | Yes |
| 1960 | 353 | 96% | Yes |
| 1961 | 337 | 92% | Yes |
| 1962 | 240 | 66% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 August 1962 | Slave Lake, CA | daily high min | 12.8 C (55.0 F) | 0.6 C (1.1 F) | 5 years | 6 of 100 (Routine) |
| 5 August 1962 | Slave Lake, CA | daily rain | 25.9 mm (1.0 in) | 11.4 mm (0.4 in) | 13 years | 22 of 100 (Routine) |
| 16 July 1962 | Slave Lake, CA | daily low max (Tie) | 16.7 C (62.1 F) | tie | 31 years | 3 of 100 (Routine) |
| 6 July 1962 | Slave Lake, CA | daily low min | 1.1 C (34.0 F) | 1.7 C (3.1 F) | 16 years | 14 of 100 (Routine) |
| 4 July 1962 | Slave Lake, CA | daily low max | 15.0 C (59.0 F) | 1.7 C (3.1 F) | 28 years | 16 of 100 (Routine) |
| 25 June 1962 | Slave Lake, CA | daily high max | 28.3 C (82.9 F) | 2.2 C (4.0 F) | 7 years | 10 of 100 (Routine) |
| 24 June 1962 | Slave Lake, CA | daily high max | 28.9 C (84.0 F) | 2.2 C (4.0 F) | 7 years | 10 of 100 (Routine) |
| 22 June 1962 | Slave Lake, CA | daily high min | 13.9 C (57.0 F) | 1.7 C (3.1 F) | 15 years | 12 of 100 (Routine) |
| 10 June 1962 | Slave Lake, CA | daily rain | 22.1 mm (0.9 in) | 1.8 mm (0.07 in) | 20 years | 12 of 100 (Routine) |
| 29 May 1962 | Slave Lake, CA | daily rain | 14.2 mm (0.6 in) | 1.8 mm (0.07 in) | 4 years | 7 of 100 (Routine) |
| 5 May 1962 | Slave Lake, CA | daily low max | 5.0 C (41.0 F) | 0.6 C (1.1 F) | 32 years | 14 of 100 (Routine) |
| 4 May 1962 | Slave Lake, CA | daily snowfall | 5.1 cm (2.0 in) | 5.1 cm (2.0 in) | 39 years | 25 of 100 (Routine) |
| 4 May 1962 | Slave Lake, CA | daily low max | 1.7 C (35.1 F) | 0.5 C (0.9 F) | 3 years | 4 of 100 (Routine) |
| 3 May 1962 | Slave Lake, CA | daily snowfall | 10.2 cm (4.0 in) | 2.6 cm (1.0 in) | 31 years | 18 of 100 (Routine) |
| 3 May 1962 | Slave Lake, CA | daily rain | 11.2 mm (0.4 in) | 3.6 mm (0.14 in) | 31 years | 17 of 100 (Routine) |
| 28 April 1962 | Slave Lake, CA | daily rain | 6.4 mm (0.25 in) | 2.6 mm (0.10 in) | 21 years | 15 of 100 (Routine) |
| 28 April 1962 | Slave Lake, CA | daily snowfall | 4.6 cm (1.8 in) | 1.0 cm (0.4 in) | 7 years | 8 of 100 (Routine) |
| 27 April 1962 | Slave Lake, CA | daily rain | 17.8 mm (0.7 in) | 13.2 mm (0.5 in) | 7 years | 20 of 100 (Routine) |
| 27 April 1962 | Slave Lake, CA | daily snowfall | 6.4 cm (2.5 in) | 6.4 cm (2.5 in) | 39 years | 33 of 100 (Routine) |
| 24 April 1962 | Slave Lake, CA | daily rain | 12.7 mm (0.5 in) | 4.1 mm (0.16 in) | 21 years | 18 of 100 (Routine) |
Climate Trend
31 complete years, 1925 to 1960| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1925 | -0.1 C | -1.01 C |
| 1928 | 1.3 C | +0.33 C |
| 1929 | -0.1 C | -1.02 C |
| 1930 | 2.2 C | +1.21 C |
| 1931 | 3.3 C | +2.32 C |
| 1932 | 0.5 C | -0.41 C |
| 1933 | -0.5 C | -1.49 C |
| 1934 | 2.4 C | +1.45 C |
| 1935 | 0.0 C | -0.93 C |
| 1936 | 0.0 C | -0.95 C |
| 1937 | 0.8 C | -0.18 C |
| 1938 | 2.5 C | +1.56 C |
| 1939 | 2.0 C | +1.03 C |
| 1940 | 2.0 C | +1.01 C |
| 1941 | 2.4 C | +1.50 C |
| 1942 | 1.8 C | +0.85 C |
| 1943 | 2.1 C | +1.20 C |
| 1944 | 2.6 C | +1.63 C |
| 1946 | 0.5 C | -0.46 C |
| 1947 | 0.5 C | -0.49 C |
| 1948 | 0.2 C | -0.75 C |
| 1949 | 0.5 C | -0.45 C |
| 1950 | -1.5 C | -2.42 C |
| 1951 | -1.4 C | -2.39 C |
| 1952 | 1.5 C | +0.59 C |
| 1953 | 1.9 C | +0.95 C |
| 1954 | 0.7 C | -0.29 C |
| 1955 | -0.9 C | -1.84 C |
| 1956 | 0.5 C | -0.46 C |
| 1959 | 0.8 C | -0.12 C |
| 1960 | 0.9 C | +0.00 C |
The fitted trend in annual mean temperature here over 1925 to 1960 is -0.3 C (-0.7 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.5 F (-1.3 to 0.4) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.3 C (-0.7 to 0.2) per decade | -0.5 F (-1.3 to 0.4) per decade | 1925 to 1960 | 31 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.7 to 0.4) per decade | -0.2 F (-1.2 to 0.7) per decade | 1925 to 1960 | 31 | Not clearly different from zero |
| Mean daily minimum | -0.38 C (-0.80 to 0.04) per decade | -0.7 F (-1.4 to 0.1) per decade | 1925 to 1960 | 31 | 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
1922 to 1962| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 37.8 C (100.0 F) | 1923 | 30.6 C (87.1 F) | 41 |
| Coldest night (TNn) | -48.3 C (-54.9 F) | 1936 | -40.6 C (-41.1 F) | 41 |
| Wettest day (Rx1day) | 75.7 mm (3.0 in) | 1938 | 29.5 mm (1.2 in) | 41 |
| Wettest five days (Rx5day) | 103.8 mm (4.1 in) | 1935 | 48.7 mm (1.9 in) | 41 |
| Longest dry spell (CDD) | 76 days | 1940 | 29 days | 41 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1922 | 26.7 C (80.1 F) |
| 1923 | 37.8 C (100.0 F) |
| 1924 | 20.0 C (68.0 F) |
| 1925 | 30.0 C (86.0 F) |
| 1926 | 31.7 C (89.1 F) |
| 1927 | 29.4 C (84.9 F) |
| 1928 | 28.9 C (84.0 F) |
| 1929 | 32.2 C (90.0 F) |
| 1930 | 30.0 C (86.0 F) |
| 1931 | 30.6 C (87.1 F) |
| 1932 | 30.0 C (86.0 F) |
| 1933 | 30.6 C (87.1 F) |
| 1934 | 30.0 C (86.0 F) |
| 1935 | 30.6 C (87.1 F) |
| 1936 | 33.3 C (91.9 F) |
| 1937 | 34.4 C (93.9 F) |
| 1938 | 31.7 C (89.1 F) |
| 1939 | 32.2 C (90.0 F) |
| 1940 | 31.1 C (88.0 F) |
| 1941 | 34.4 C (93.9 F) |
| 1942 | 33.9 C (93.0 F) |
| 1943 | 30.0 C (86.0 F) |
| 1944 | 31.1 C (88.0 F) |
| 1945 | 33.3 C (91.9 F) |
| 1946 | 30.0 C (86.0 F) |
| 1947 | 27.2 C (81.0 F) |
| 1948 | 29.4 C (84.9 F) |
| 1949 | 32.2 C (90.0 F) |
| 1950 | 31.1 C (88.0 F) |
| 1951 | 29.4 C (84.9 F) |
| 1952 | 28.9 C (84.0 F) |
| 1953 | 30.6 C (87.1 F) |
| 1954 | 31.7 C (89.1 F) |
| 1955 | 31.7 C (89.1 F) |
| 1956 | 30.0 C (86.0 F) |
| 1957 | 27.8 C (82.0 F) |
| 1958 | 27.2 C (81.0 F) |
| 1959 | 34.4 C (93.9 F) |
| 1960 | 31.1 C (88.0 F) |
| 1961 | 32.8 C (91.0 F) |
| 1962 | 28.9 C (84.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1922 | -37.8 C (-36.0 F) |
| 1923 | -42.8 C (-45.0 F) |
| 1924 | -42.8 C (-45.0 F) |
| 1925 | -43.3 C (-45.9 F) |
| 1926 | -28.9 C (-20.0 F) |
| 1927 | -42.8 C (-45.0 F) |
| 1928 | -38.9 C (-38.0 F) |
| 1929 | -44.4 C (-47.9 F) |
| 1930 | -40.0 C (-40.0 F) |
| 1931 | -31.1 C (-24.0 F) |
| 1932 | -40.0 C (-40.0 F) |
| 1933 | -43.3 C (-45.9 F) |
| 1934 | -40.0 C (-40.0 F) |
| 1935 | -45.6 C (-50.1 F) |
| 1936 | -48.3 C (-54.9 F) |
| 1937 | -44.4 C (-47.9 F) |
| 1938 | -44.4 C (-47.9 F) |
| 1939 | -48.3 C (-54.9 F) |
| 1940 | -34.4 C (-29.9 F) |
| 1941 | -46.1 C (-51.0 F) |
| 1942 | -35.0 C (-31.0 F) |
| 1943 | -42.8 C (-45.0 F) |
| 1944 | -38.3 C (-36.9 F) |
| 1945 | -40.0 C (-40.0 F) |
| 1946 | -40.0 C (-40.0 F) |
| 1947 | -48.3 C (-54.9 F) |
| 1948 | -40.6 C (-41.1 F) |
| 1949 | -40.6 C (-41.1 F) |
| 1950 | -47.2 C (-53.0 F) |
| 1951 | -41.1 C (-42.0 F) |
| 1952 | -41.7 C (-43.1 F) |
| 1953 | -46.7 C (-52.1 F) |
| 1954 | -46.1 C (-51.0 F) |
| 1955 | -40.0 C (-40.0 F) |
| 1956 | -40.6 C (-41.1 F) |
| 1957 | -37.8 C (-36.0 F) |
| 1958 | -29.4 C (-20.9 F) |
| 1959 | -38.9 C (-38.0 F) |
| 1960 | -38.3 C (-36.9 F) |
| 1961 | -36.7 C (-34.1 F) |
| 1962 | -43.3 C (-45.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1922 | 21.1 mm (0.8 in) |
| 1923 | 26.9 mm (1.1 in) |
| 1924 | 10.2 mm (0.4 in) |
| 1925 | 36.8 mm (1.4 in) |
| 1926 | 34.5 mm (1.4 in) |
| 1927 | 25.4 mm (1.0 in) |
| 1928 | 12.7 mm (0.5 in) |
| 1929 | 19.8 mm (0.8 in) |
| 1930 | 21.6 mm (0.9 in) |
| 1931 | 41.1 mm (1.6 in) |
| 1932 | 31.0 mm (1.2 in) |
| 1933 | 47.2 mm (1.9 in) |
| 1934 | 25.4 mm (1.0 in) |
| 1935 | 44.5 mm (1.8 in) |
| 1936 | 34.3 mm (1.4 in) |
| 1937 | 39.9 mm (1.6 in) |
| 1938 | 75.7 mm (3.0 in) |
| 1939 | 38.1 mm (1.5 in) |
| 1940 | 30.5 mm (1.2 in) |
| 1941 | 23.9 mm (0.9 in) |
| 1942 | 25.4 mm (1.0 in) |
| 1943 | 27.9 mm (1.1 in) |
| 1944 | 63.2 mm (2.5 in) |
| 1945 | 47.0 mm (1.9 in) |
| 1946 | 28.2 mm (1.1 in) |
| 1947 | 24.9 mm (1.0 in) |
| 1948 | 22.6 mm (0.9 in) |
| 1949 | 37.1 mm (1.5 in) |
| 1950 | 27.4 mm (1.1 in) |
| 1951 | 45.2 mm (1.8 in) |
| 1952 | 19.8 mm (0.8 in) |
| 1953 | 43.2 mm (1.7 in) |
| 1954 | 48.8 mm (1.9 in) |
| 1955 | 31.8 mm (1.3 in) |
| 1956 | 24.1 mm (0.9 in) |
| 1957 | 25.4 mm (1.0 in) |
| 1958 | 29.5 mm (1.2 in) |
| 1959 | 21.1 mm (0.8 in) |
| 1960 | 31.5 mm (1.2 in) |
| 1961 | 55.4 mm (2.2 in) |
| 1962 | 25.9 mm (1.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1922 | 25.6 mm (1.0 in) |
| 1923 | 33.8 mm (1.3 in) |
| 1924 | 28.0 mm (1.1 in) |
| 1925 | 49.0 mm (1.9 in) |
| 1926 | 46.8 mm (1.8 in) |
| 1927 | 25.4 mm (1.0 in) |
| 1928 | 32.0 mm (1.3 in) |
| 1929 | 43.5 mm (1.7 in) |
| 1930 | 39.9 mm (1.6 in) |
| 1931 | 51.5 mm (2.0 in) |
| 1932 | 48.7 mm (1.9 in) |
| 1933 | 59.9 mm (2.4 in) |
| 1934 | 64.9 mm (2.6 in) |
| 1935 | 103.8 mm (4.1 in) |
| 1936 | 72.8 mm (2.9 in) |
| 1937 | 96.7 mm (3.8 in) |
| 1938 | 87.4 mm (3.4 in) |
| 1939 | 48.3 mm (1.9 in) |
| 1940 | 40.6 mm (1.6 in) |
| 1941 | 54.9 mm (2.2 in) |
| 1942 | 41.4 mm (1.6 in) |
| 1943 | 57.1 mm (2.2 in) |
| 1944 | 76.5 mm (3.0 in) |
| 1945 | 60.4 mm (2.4 in) |
| 1946 | 44.5 mm (1.8 in) |
| 1947 | 46.5 mm (1.8 in) |
| 1948 | 32.8 mm (1.3 in) |
| 1949 | 63.7 mm (2.5 in) |
| 1950 | 38.0 mm (1.5 in) |
| 1951 | 93.7 mm (3.7 in) |
| 1952 | 46.2 mm (1.8 in) |
| 1953 | 53.8 mm (2.1 in) |
| 1954 | 54.6 mm (2.1 in) |
| 1955 | 61.0 mm (2.4 in) |
| 1956 | 39.6 mm (1.6 in) |
| 1957 | 63.3 mm (2.5 in) |
| 1958 | 32.0 mm (1.3 in) |
| 1959 | 29.9 mm (1.2 in) |
| 1960 | 67.1 mm (2.6 in) |
| 1961 | 69.9 mm (2.8 in) |
| 1962 | 44.7 mm (1.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1922 | 16 days |
| 1923 | 23 days |
| 1924 | 25 days |
| 1925 | 33 days |
| 1926 | 18 days |
| 1927 | 37 days |
| 1928 | 43 days |
| 1929 | 33 days |
| 1930 | 45 days |
| 1931 | 29 days |
| 1932 | 25 days |
| 1933 | 35 days |
| 1934 | 28 days |
| 1935 | 39 days |
| 1936 | 29 days |
| 1937 | 27 days |
| 1938 | 36 days |
| 1939 | 51 days |
| 1940 | 76 days |
| 1941 | 29 days |
| 1942 | 26 days |
| 1943 | 33 days |
| 1944 | 35 days |
| 1945 | 20 days |
| 1946 | 30 days |
| 1947 | 19 days |
| 1948 | 41 days |
| 1949 | 20 days |
| 1950 | 23 days |
| 1951 | 21 days |
| 1952 | 43 days |
| 1953 | 34 days |
| 1954 | 31 days |
| 1955 | 21 days |
| 1956 | 27 days |
| 1957 | 29 days |
| 1958 | 23 days |
| 1959 | 36 days |
| 1960 | 37 days |
| 1961 | 28 days |
| 1962 | 26 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
31 years with a frostAcross 31 years with a frost, the median last spring frost at Slave Lake falls on 5 June and the median first autumn frost on 31 August, which leaves a median of 88 days between them.
Fitted over all years, the growing season changes by -1.8 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1928 to 1960) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 5 June | n/a | 5 June | n/a | +2.9 days per decade |
| First autumn frost | 31 August | n/a | 31 August | n/a | +1.2 days per decade |
| Growing days | 88 days | n/a | 88 days | n/a | -1.8 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
33 years, 1925 to 1961A day with at least 31.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 85.7 mm (3.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 31.3 mm (1.2 in) | |
| 5 years | 42.5 mm (1.7 in) | |
| 10 years | 51.1 mm (2.0 in) | |
| 25 years | 63.6 mm (2.5 in) | |
| 50 years | 74.1 mm (2.9 in) | Longer than the 33 years of record |
| 100 years | 85.7 mm (3.4 in) | Longer than the 33 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, 33 years of values from 1925 to 1961.
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: 75.7 mm (3.0 in) in 1938; 63.2 mm (2.5 in) in 1944; 55.4 mm (2.2 in) in 1961.
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).