Fort Simpson Weather Records (CA002202100)
Record envelope, standing records and threshold days for Fort Simpson (CA002202100), Northwest Territories, Canada, with 69 years of record.
Key Facts for Fort Simpson
- Fort Simpson (CA002202100) is a weather station in Northwest Territories, Canada at 61.87 latitude and -121.35 longitude, 132 m (433 ft) above sea level.
- The station reports from 1895 to 1963, 69 years of record.
- 1,464 records set at Fort Simpson still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Fort Simpson set a daily record high maximum temperature of 18.3 C (64.9 F) on 16 October 1963.
About the Station
- Location: Northwest Territories, Canada, 61.87 latitude, -121.35 longitude.
- Elevation: 132 m (433 ft).
- Period of record: 1895 to 1963, 69 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 | 11.7 C (53.1 F) | -54.4 C (-65.9 F) | n/a | n/a |
| Feb | 15.6 C (60.1 F) | -56.2 C (-69.2 F) | n/a | n/a |
| Mar | 12.8 C (55.0 F) | -46.7 C (-52.1 F) | n/a | n/a |
| Apr | 21.7 C (71.1 F) | -39.4 C (-38.9 F) | n/a | n/a |
| May | 31.7 C (89.1 F) | -22.8 C (-9.0 F) | n/a | n/a |
| Jun | 35.0 C (95.0 F) | -3.9 C (25.0 F) | n/a | n/a |
| Jul | 36.1 C (97.0 F) | -0.6 C (30.9 F) | n/a | n/a |
| Aug | 34.4 C (93.9 F) | -6.1 C (21.0 F) | n/a | n/a |
| Sep | 30.0 C (86.0 F) | -16.1 C (3.0 F) | n/a | n/a |
| Oct | 30.6 C (87.1 F) | -27.8 C (-18.0 F) | n/a | n/a |
| Nov | 13.3 C (55.9 F) | -46.1 C (-51.0 F) | n/a | n/a |
| Dec | 11.1 C (52.0 F) | -53.3 C (-63.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1895 | 8 |
| 1897 | 27 |
| 1898 | 33 |
| 1899 | 29 |
| 1900 | 27 |
| 1901 | 6 |
| 1902 | 23 |
| 1903 | 21 |
| 1904 | 11 |
| 1905 | 20 |
| 1906 | 12 |
| 1907 | 18 |
| 1908 | 24 |
| 1909 | 20 |
| 1910 | 11 |
| 1911 | 22 |
| 1912 | 15 |
| 1913 | 16 |
| 1914 | 4 |
| 1915 | 32 |
| 1916 | 33 |
| 1917 | 32 |
| 1918 | 35 |
| 1919 | 16 |
| 1920 | 37 |
| 1921 | 4 |
| 1922 | 3 |
| 1923 | 41 |
| 1924 | 39 |
| 1925 | 20 |
| 1926 | 20 |
| 1927 | 11 |
| 1928 | 18 |
| 1929 | 19 |
| 1930 | 20 |
| 1931 | 18 |
| 1932 | 22 |
| 1933 | 24 |
| 1934 | 30 |
| 1935 | 23 |
| 1936 | 34 |
| 1937 | 19 |
| 1938 | 34 |
| 1939 | 12 |
| 1940 | 26 |
| 1941 | 23 |
| 1942 | 23 |
| 1943 | 24 |
| 1944 | 34 |
| 1945 | 26 |
| 1946 | 18 |
| 1947 | 25 |
| 1948 | 25 |
| 1949 | 28 |
| 1950 | 23 |
| 1951 | 18 |
| 1952 | 17 |
| 1953 | 16 |
| 1954 | 29 |
| 1955 | 27 |
| 1956 | 40 |
| 1957 | 13 |
| 1958 | 13 |
| 1959 | 18 |
| 1960 | 7 |
| 1961 | 25 |
| 1962 | 17 |
| 1963 | 6 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 1933-12-31 | Record low minimum temperature | Record low minimum temperature -53.3 C (-63.9 F) |
| 1935-07-24 | Record daily precipitation | Record daily precipitation 86.4 mm (3.4 in) |
| 1936-01-04 | Record low minimum temperature | Record low minimum temperature -53.9 C (-65.0 F) |
| 1936-01-05 | Record low maximum temperature | Record low maximum temperature -49.4 C (-56.9 F) |
| 1936-01-05 | Record low minimum temperature | Record low minimum temperature -54.4 C (-65.9 F) |
| 1937-06-30 | Record high maximum temperature | Record high maximum temperature 35.0 C (95.0 F) |
| 1941-07-17 | Record high maximum temperature | Record high maximum temperature 36.1 C (97.0 F) |
| 1947-02-01 | Record low minimum temperature | Record low minimum temperature -56.2 C (-69.2 F) |
Wettest Day of Each Month
Jul: 86.4 mm (3.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 23.4 mm (0.9 in) | 8 January 1961 |
| Feb | 18.5 mm (0.7 in) | 27 February 1916 |
| Mar | 20.3 mm (0.8 in) | 13 March 1932 |
| Apr | 30.5 mm (1.2 in) | 7 April 1905 |
| May | 40.6 mm (1.6 in) | 7 May 1911 |
| Jun | 61.5 mm (2.4 in) | 11 June 1944 |
| Jul | 86.4 mm (3.4 in) | 24 July 1935 |
| Aug | 59.2 mm (2.3 in) | 24 August 1937 |
| Sep | 33.5 mm (1.3 in) | 16 September 1945 |
| Oct | 41.9 mm (1.6 in) | 2 October 1899 |
| Nov | 19.1 mm (0.8 in) | 3 November 1950 |
| Dec | 30.5 mm (1.2 in) | 6 December 1895 |
Period of Record Coverage
1895 to 1963| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1895 | 61 | 17% | No |
| 1897 | 305 | 84% | No |
| 1898 | 352 | 96% | Yes |
| 1899 | 356 | 98% | Yes |
| 1900 | 360 | 99% | Yes |
| 1901 | 361 | 99% | Yes |
| 1902 | 360 | 99% | Yes |
| 1903 | 217 | 59% | No |
| 1904 | 177 | 48% | No |
| 1905 | 282 | 77% | No |
| 1906 | 240 | 66% | No |
| 1907 | 284 | 78% | No |
| 1908 | 320 | 87% | No |
| 1909 | 31 | 8% | No |
| 1910 | 160 | 44% | No |
| 1911 | 364 | 100% | Yes |
| 1912 | 365 | 100% | Yes |
| 1913 | 242 | 66% | No |
| 1914 | 153 | 42% | No |
| 1915 | 355 | 97% | Yes |
| 1916 | 363 | 99% | Yes |
| 1917 | 364 | 100% | Yes |
| 1918 | 364 | 100% | Yes |
| 1919 | 364 | 100% | Yes |
| 1920 | 366 | 100% | Yes |
| 1921 | 181 | 50% | No |
| 1922 | 151 | 41% | No |
| 1923 | 365 | 100% | Yes |
| 1924 | 366 | 100% | Yes |
| 1925 | 77 | 21% | No |
| 1926 | 202 | 55% | No |
| 1927 | 306 | 84% | No |
| 1928 | 323 | 88% | No |
| 1929 | 365 | 100% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 364 | 100% | Yes |
| 1932 | 366 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 334 | 92% | Yes |
| 1935 | 334 | 92% | Yes |
| 1936 | 352 | 96% | Yes |
| 1937 | 364 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 363 | 99% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 357 | 98% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 364 | 100% | Yes |
| 1955 | 365 | 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 | 304 | 83% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 16 October 1963 | Fort Simpson, CA | daily high max | 18.3 C (64.9 F) | 0.5 C (0.9 F) | 32 years | 15 of 100 (Routine) |
| 16 October 1963 | Fort Simpson, CA | daily high min (Tie) | 4.4 C (39.9 F) | tie | 32 years | 3 of 100 (Routine) |
| 17 August 1963 | Fort Simpson, CA | daily high min (Tie) | 13.9 C (57.0 F) | tie | 50 years | 5 of 100 (Routine) |
| 16 August 1963 | Fort Simpson, CA | daily high min (Tie) | 14.4 C (57.9 F) | tie | 36 years | 4 of 100 (Routine) |
| 11 August 1963 | Fort Simpson, CA | daily rain | 13.5 mm (0.5 in) | 3.3 mm (0.13 in) | 44 years | 20 of 100 (Routine) |
| 14 July 1963 | Fort Simpson, CA | daily low max (Tie) | 16.1 C (61.0 F) | tie | 62 years | 6 of 100 (Routine) |
| 10 July 1963 | Fort Simpson, CA | daily rain | 29.0 mm (1.1 in) | 13.8 mm (0.5 in) | 36 years | 34 of 100 (Routine) |
| 23 May 1963 | Fort Simpson, CA | daily snowfall | 0.8 cm (0.3 in) | 0.8 cm (0.3 in) | 65 years | 20 of 100 (Routine) |
| 22 May 1963 | Fort Simpson, CA | daily high max | 26.1 C (79.0 F) | 1.1 C (2.0 F) | 22 years | 13 of 100 (Routine) |
| 22 May 1963 | Fort Simpson, CA | daily high min (Tie) | 10.0 C (50.0 F) | tie | 37 years | 4 of 100 (Routine) |
| 21 May 1963 | Fort Simpson, CA | daily high max | 26.7 C (80.1 F) | 1.1 C (2.0 F) | 4 years | 8 of 100 (Routine) |
| 10 March 1963 | Fort Simpson, CA | daily high min (Tie) | -12.2 C (10.0 F) | tie | 53 years | 5 of 100 (Routine) |
| 26 February 1963 | Fort Simpson, CA | daily rain | 5.1 mm (0.20 in) | 1.3 mm (0.05 in) | 62 years | 20 of 100 (Routine) |
| 26 February 1963 | Fort Simpson, CA | daily snowfall | 5.1 cm (2.0 in) | 1.3 cm (0.5 in) | 62 years | 28 of 100 (Routine) |
| 14 February 1963 | Fort Simpson, CA | daily rain | 3.0 mm (0.12 in) | 0.5 mm (0.02 in) | 60 years | 20 of 100 (Routine) |
| 14 February 1963 | Fort Simpson, CA | daily snowfall | 3.0 cm (1.2 in) | 0.5 cm (0.2 in) | 60 years | 20 of 100 (Routine) |
| 14 February 1963 | Fort Simpson, CA | daily high min | -16.1 C (3.0 F) | 0.6 C (1.1 F) | 23 years | 12 of 100 (Routine) |
| 12 February 1963 | Fort Simpson, CA | daily high min | -14.4 C (6.1 F) | 3.4 C (6.1 F) | 9 years | 11 of 100 (Routine) |
| 10 January 1963 | Fort Simpson, CA | daily low min | -45.0 C (-49.0 F) | 1.1 C (2.0 F) | 52 years | 22 of 100 (Routine) |
| 7 January 1963 | Fort Simpson, CA | daily rain | 12.7 mm (0.5 in) | 7.6 mm (0.30 in) | 60 years | 20 of 100 (Routine) |
Climate Trend
45 complete years, 1898 to 1962| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1898 | -5.1 C | -0.92 C |
| 1899 | -7.0 C | -2.77 C |
| 1900 | -6.2 C | -2.04 C |
| 1902 | -6.2 C | -2.04 C |
| 1911 | -4.3 C | -0.09 C |
| 1912 | -3.3 C | +0.93 C |
| 1915 | -3.2 C | +1.03 C |
| 1916 | -4.1 C | +0.11 C |
| 1917 | -6.2 C | -1.97 C |
| 1918 | -6.0 C | -1.85 C |
| 1919 | -5.2 C | -1.02 C |
| 1920 | -4.3 C | -0.14 C |
| 1923 | -3.6 C | +0.61 C |
| 1924 | -4.1 C | +0.12 C |
| 1930 | -3.0 C | +1.20 C |
| 1931 | -2.7 C | +1.45 C |
| 1932 | -5.1 C | -0.94 C |
| 1933 | -6.3 C | -2.16 C |
| 1936 | -6.0 C | -1.85 C |
| 1937 | -3.0 C | +1.15 C |
| 1938 | -2.3 C | +1.86 C |
| 1939 | -4.1 C | +0.06 C |
| 1940 | -3.0 C | +1.16 C |
| 1941 | -3.9 C | +0.28 C |
| 1942 | -2.9 C | +1.32 C |
| 1943 | -2.0 C | +2.19 C |
| 1944 | -1.6 C | +2.63 C |
| 1945 | -4.2 C | +0.01 C |
| 1946 | -4.5 C | -0.28 C |
| 1947 | -4.1 C | +0.05 C |
| 1948 | -4.5 C | -0.31 C |
| 1949 | -3.0 C | +1.17 C |
| 1950 | -4.9 C | -0.69 C |
| 1951 | -5.1 C | -0.89 C |
| 1952 | -3.0 C | +1.14 C |
| 1953 | -2.6 C | +1.63 C |
| 1954 | -3.7 C | +0.46 C |
| 1955 | -5.3 C | -1.08 C |
| 1956 | -4.9 C | -0.76 C |
| 1957 | -3.5 C | +0.69 C |
| 1958 | -3.0 C | +1.23 C |
| 1959 | -4.8 C | -0.59 C |
| 1960 | -3.8 C | +0.35 C |
| 1961 | -5.5 C | -1.28 C |
| 1962 | -3.4 C | +0.83 C |
The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1898 to 1962. In Fahrenheit: 0.5 F (0.1 to 0.8) per decade. The slope is a straight line fitted to 45 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 (0.1 to 0.5) per decade | 0.5 F (0.1 to 0.8) per decade | 1898 to 1962 | 45 | Rise |
| Mean daily maximum | 0.2 C (-0.1 to 0.4) per decade | 0.3 F (-0.1 to 0.7) per decade | 1898 to 1962 | 45 | Not clearly different from zero |
| Mean daily minimum | 0.4 C (0.2 to 0.6) per decade | 0.7 F (0.3 to 1.0) per decade | 1898 to 1962 | 45 | 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
1895 to 1963| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.1 C (97.0 F) | 1941 | 30.6 C (87.1 F) | 68 |
| Coldest night (TNn) | -56.2 C (-69.2 F) | 1947 | -46.4 C (-51.5 F) | 68 |
| Wettest day (Rx1day) | 86.4 mm (3.4 in) | 1935 | 27.9 mm (1.1 in) | 68 |
| Wettest five days (Rx5day) | 99.6 mm (3.9 in) | 1935 | 43.0 mm (1.7 in) | 68 |
| Longest dry spell (CDD) | 68 days | 1940 | 30 days | 68 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1895 | 0.6 C (33.1 F) |
| 1897 | 27.8 C (82.0 F) |
| 1898 | 28.9 C (84.0 F) |
| 1899 | 28.9 C (84.0 F) |
| 1900 | 26.7 C (80.1 F) |
| 1901 | 27.2 C (81.0 F) |
| 1902 | 27.2 C (81.0 F) |
| 1903 | 30.6 C (87.1 F) |
| 1904 | 25.0 C (77.0 F) |
| 1905 | 30.0 C (86.0 F) |
| 1906 | 30.6 C (87.1 F) |
| 1907 | 30.6 C (87.1 F) |
| 1908 | 34.4 C (93.9 F) |
| 1909 | -9.4 C (15.1 F) |
| 1910 | 28.9 C (84.0 F) |
| 1911 | 28.3 C (82.9 F) |
| 1912 | 32.2 C (90.0 F) |
| 1913 | 33.9 C (93.0 F) |
| 1914 | 27.2 C (81.0 F) |
| 1915 | 30.6 C (87.1 F) |
| 1916 | 32.2 C (90.0 F) |
| 1917 | 30.6 C (87.1 F) |
| 1918 | 29.4 C (84.9 F) |
| 1919 | 27.8 C (82.0 F) |
| 1920 | 32.2 C (90.0 F) |
| 1921 | 26.1 C (79.0 F) |
| 1922 | 27.8 C (82.0 F) |
| 1923 | 34.4 C (93.9 F) |
| 1924 | 31.7 C (89.1 F) |
| 1925 | 31.1 C (88.0 F) |
| 1926 | 32.2 C (90.0 F) |
| 1927 | 30.6 C (87.1 F) |
| 1928 | 27.8 C (82.0 F) |
| 1929 | 30.6 C (87.1 F) |
| 1930 | 32.2 C (90.0 F) |
| 1931 | 31.7 C (89.1 F) |
| 1932 | 32.2 C (90.0 F) |
| 1933 | 31.7 C (89.1 F) |
| 1934 | 28.9 C (84.0 F) |
| 1935 | 30.6 C (87.1 F) |
| 1936 | 30.6 C (87.1 F) |
| 1937 | 35.0 C (95.0 F) |
| 1938 | 31.1 C (88.0 F) |
| 1939 | 28.9 C (84.0 F) |
| 1940 | 29.4 C (84.9 F) |
| 1941 | 36.1 C (97.0 F) |
| 1942 | 32.2 C (90.0 F) |
| 1943 | 30.6 C (87.1 F) |
| 1944 | 31.7 C (89.1 F) |
| 1945 | 33.9 C (93.0 F) |
| 1946 | 33.3 C (91.9 F) |
| 1947 | 30.6 C (87.1 F) |
| 1948 | 31.7 C (89.1 F) |
| 1949 | 30.0 C (86.0 F) |
| 1950 | 34.4 C (93.9 F) |
| 1951 | 30.0 C (86.0 F) |
| 1952 | 31.7 C (89.1 F) |
| 1953 | 35.0 C (95.0 F) |
| 1954 | 30.0 C (86.0 F) |
| 1955 | 35.0 C (95.0 F) |
| 1956 | 30.6 C (87.1 F) |
| 1957 | 28.9 C (84.0 F) |
| 1958 | 30.6 C (87.1 F) |
| 1959 | 32.2 C (90.0 F) |
| 1960 | 29.4 C (84.9 F) |
| 1961 | 31.1 C (88.0 F) |
| 1962 | 30.0 C (86.0 F) |
| 1963 | 29.4 C (84.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1895 | -48.3 C (-54.9 F) |
| 1897 | -43.9 C (-47.0 F) |
| 1898 | -47.8 C (-54.0 F) |
| 1899 | -47.8 C (-54.0 F) |
| 1900 | -46.1 C (-51.0 F) |
| 1901 | -52.2 C (-62.0 F) |
| 1902 | -46.7 C (-52.1 F) |
| 1903 | -43.9 C (-47.0 F) |
| 1904 | -48.3 C (-54.9 F) |
| 1905 | -46.1 C (-51.0 F) |
| 1906 | -32.8 C (-27.0 F) |
| 1907 | -45.6 C (-50.1 F) |
| 1908 | -43.3 C (-45.9 F) |
| 1909 | -48.9 C (-56.0 F) |
| 1910 | -44.4 C (-47.9 F) |
| 1911 | -48.3 C (-54.9 F) |
| 1912 | -46.1 C (-51.0 F) |
| 1913 | -51.7 C (-61.1 F) |
| 1914 | -48.9 C (-56.0 F) |
| 1915 | -39.4 C (-38.9 F) |
| 1916 | -44.4 C (-47.9 F) |
| 1917 | -52.2 C (-62.0 F) |
| 1918 | -47.8 C (-54.0 F) |
| 1919 | -47.2 C (-53.0 F) |
| 1920 | -45.6 C (-50.1 F) |
| 1921 | -43.3 C (-45.9 F) |
| 1922 | -37.8 C (-36.0 F) |
| 1923 | -47.2 C (-53.0 F) |
| 1924 | -48.9 C (-56.0 F) |
| 1925 | -48.9 C (-56.0 F) |
| 1926 | -45.6 C (-50.1 F) |
| 1927 | -46.1 C (-51.0 F) |
| 1928 | -40.0 C (-40.0 F) |
| 1929 | -46.7 C (-52.1 F) |
| 1930 | -45.6 C (-50.1 F) |
| 1931 | -40.6 C (-41.1 F) |
| 1932 | -46.7 C (-52.1 F) |
| 1933 | -53.3 C (-63.9 F) |
| 1934 | -53.3 C (-63.9 F) |
| 1935 | -50.6 C (-59.1 F) |
| 1936 | -54.4 C (-65.9 F) |
| 1937 | -48.9 C (-56.0 F) |
| 1938 | -46.7 C (-52.1 F) |
| 1939 | -50.0 C (-58.0 F) |
| 1940 | -45.6 C (-50.1 F) |
| 1941 | -46.1 C (-51.0 F) |
| 1942 | -44.4 C (-47.9 F) |
| 1943 | -48.3 C (-54.9 F) |
| 1944 | -40.0 C (-40.0 F) |
| 1945 | -45.0 C (-49.0 F) |
| 1946 | -48.3 C (-54.9 F) |
| 1947 | -56.2 C (-69.2 F) |
| 1948 | -45.0 C (-49.0 F) |
| 1949 | -45.0 C (-49.0 F) |
| 1950 | -45.0 C (-49.0 F) |
| 1951 | -48.3 C (-54.9 F) |
| 1952 | -46.7 C (-52.1 F) |
| 1953 | -43.9 C (-47.0 F) |
| 1954 | -48.3 C (-54.9 F) |
| 1955 | -43.9 C (-47.0 F) |
| 1956 | -43.9 C (-47.0 F) |
| 1957 | -43.9 C (-47.0 F) |
| 1958 | -41.7 C (-43.1 F) |
| 1959 | -49.4 C (-56.9 F) |
| 1960 | -47.2 C (-53.0 F) |
| 1961 | -45.0 C (-49.0 F) |
| 1962 | -43.3 C (-45.9 F) |
| 1963 | -46.7 C (-52.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1895 | 30.5 mm (1.2 in) |
| 1897 | 25.4 mm (1.0 in) |
| 1898 | 29.5 mm (1.2 in) |
| 1899 | 41.9 mm (1.6 in) |
| 1900 | 38.1 mm (1.5 in) |
| 1901 | 26.4 mm (1.0 in) |
| 1902 | 27.9 mm (1.1 in) |
| 1903 | 30.5 mm (1.2 in) |
| 1904 | 25.4 mm (1.0 in) |
| 1905 | 30.5 mm (1.2 in) |
| 1906 | 31.2 mm (1.2 in) |
| 1907 | 25.4 mm (1.0 in) |
| 1908 | 16.5 mm (0.6 in) |
| 1909 | 12.7 mm (0.5 in) |
| 1910 | 35.1 mm (1.4 in) |
| 1911 | 40.6 mm (1.6 in) |
| 1912 | 33.0 mm (1.3 in) |
| 1913 | 34.0 mm (1.3 in) |
| 1914 | 27.9 mm (1.1 in) |
| 1915 | 27.2 mm (1.1 in) |
| 1916 | 25.4 mm (1.0 in) |
| 1917 | 28.4 mm (1.1 in) |
| 1918 | 23.4 mm (0.9 in) |
| 1919 | 25.9 mm (1.0 in) |
| 1920 | 22.9 mm (0.9 in) |
| 1921 | 28.4 mm (1.1 in) |
| 1922 | 15.0 mm (0.6 in) |
| 1923 | 27.2 mm (1.1 in) |
| 1924 | 12.7 mm (0.5 in) |
| 1925 | 26.2 mm (1.0 in) |
| 1926 | 18.3 mm (0.7 in) |
| 1927 | 33.3 mm (1.3 in) |
| 1928 | 31.8 mm (1.3 in) |
| 1929 | 17.8 mm (0.7 in) |
| 1930 | 15.2 mm (0.6 in) |
| 1931 | 16.8 mm (0.7 in) |
| 1932 | 28.2 mm (1.1 in) |
| 1933 | 21.1 mm (0.8 in) |
| 1934 | 19.8 mm (0.8 in) |
| 1935 | 86.4 mm (3.4 in) |
| 1936 | 30.0 mm (1.2 in) |
| 1937 | 59.2 mm (2.3 in) |
| 1938 | 20.3 mm (0.8 in) |
| 1939 | 17.8 mm (0.7 in) |
| 1940 | 32.8 mm (1.3 in) |
| 1941 | 23.6 mm (0.9 in) |
| 1942 | 13.5 mm (0.5 in) |
| 1943 | 14.5 mm (0.6 in) |
| 1944 | 61.5 mm (2.4 in) |
| 1945 | 33.5 mm (1.3 in) |
| 1946 | 15.0 mm (0.6 in) |
| 1947 | 27.9 mm (1.1 in) |
| 1948 | 36.8 mm (1.4 in) |
| 1949 | 36.6 mm (1.4 in) |
| 1950 | 42.9 mm (1.7 in) |
| 1951 | 20.8 mm (0.8 in) |
| 1952 | 22.6 mm (0.9 in) |
| 1953 | 9.7 mm (0.38 in) |
| 1954 | 36.1 mm (1.4 in) |
| 1955 | 32.0 mm (1.3 in) |
| 1956 | 49.8 mm (2.0 in) |
| 1957 | 28.7 mm (1.1 in) |
| 1958 | 22.9 mm (0.9 in) |
| 1959 | 25.1 mm (1.0 in) |
| 1960 | 60.2 mm (2.4 in) |
| 1961 | 34.0 mm (1.3 in) |
| 1962 | 35.8 mm (1.4 in) |
| 1963 | 29.0 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1895 | 38.9 mm (1.5 in) |
| 1897 | 38.0 mm (1.5 in) |
| 1898 | 54.1 mm (2.1 in) |
| 1899 | 54.4 mm (2.1 in) |
| 1900 | 38.1 mm (1.5 in) |
| 1901 | 26.9 mm (1.1 in) |
| 1902 | 37.8 mm (1.5 in) |
| 1903 | 76.7 mm (3.0 in) |
| 1904 | 42.2 mm (1.7 in) |
| 1905 | 61.0 mm (2.4 in) |
| 1906 | 48.5 mm (1.9 in) |
| 1907 | 38.1 mm (1.5 in) |
| 1908 | 30.5 mm (1.2 in) |
| 1909 | 22.9 mm (0.9 in) |
| 1910 | 59.0 mm (2.3 in) |
| 1911 | 67.5 mm (2.7 in) |
| 1912 | 66.6 mm (2.6 in) |
| 1913 | 67.0 mm (2.6 in) |
| 1914 | 40.4 mm (1.6 in) |
| 1915 | 43.5 mm (1.7 in) |
| 1916 | 63.6 mm (2.5 in) |
| 1917 | 46.8 mm (1.8 in) |
| 1918 | 35.1 mm (1.4 in) |
| 1919 | 32.8 mm (1.3 in) |
| 1920 | 22.9 mm (0.9 in) |
| 1921 | 61.6 mm (2.4 in) |
| 1922 | 19.4 mm (0.8 in) |
| 1923 | 49.3 mm (1.9 in) |
| 1924 | 28.0 mm (1.1 in) |
| 1925 | 27.0 mm (1.1 in) |
| 1926 | 18.8 mm (0.7 in) |
| 1927 | 58.7 mm (2.3 in) |
| 1928 | 35.1 mm (1.4 in) |
| 1929 | 48.2 mm (1.9 in) |
| 1930 | 35.5 mm (1.4 in) |
| 1931 | 28.9 mm (1.1 in) |
| 1932 | 57.6 mm (2.3 in) |
| 1933 | 33.3 mm (1.3 in) |
| 1934 | 28.7 mm (1.1 in) |
| 1935 | 99.6 mm (3.9 in) |
| 1936 | 38.1 mm (1.5 in) |
| 1937 | 67.6 mm (2.7 in) |
| 1938 | 51.5 mm (2.0 in) |
| 1939 | 31.4 mm (1.2 in) |
| 1940 | 47.3 mm (1.9 in) |
| 1941 | 50.8 mm (2.0 in) |
| 1942 | 15.0 mm (0.6 in) |
| 1943 | 21.4 mm (0.8 in) |
| 1944 | 85.1 mm (3.4 in) |
| 1945 | 54.1 mm (2.1 in) |
| 1946 | 21.8 mm (0.9 in) |
| 1947 | 53.0 mm (2.1 in) |
| 1948 | 52.0 mm (2.0 in) |
| 1949 | 72.2 mm (2.8 in) |
| 1950 | 85.1 mm (3.4 in) |
| 1951 | 28.2 mm (1.1 in) |
| 1952 | 45.4 mm (1.8 in) |
| 1953 | 17.6 mm (0.7 in) |
| 1954 | 49.0 mm (1.9 in) |
| 1955 | 38.1 mm (1.5 in) |
| 1956 | 86.1 mm (3.4 in) |
| 1957 | 75.1 mm (3.0 in) |
| 1958 | 43.2 mm (1.7 in) |
| 1959 | 33.2 mm (1.3 in) |
| 1960 | 86.9 mm (3.4 in) |
| 1961 | 39.1 mm (1.5 in) |
| 1962 | 41.5 mm (1.6 in) |
| 1963 | 42.8 mm (1.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1895 | 10 days |
| 1897 | 25 days |
| 1898 | 37 days |
| 1899 | 21 days |
| 1900 | 23 days |
| 1901 | 30 days |
| 1902 | 27 days |
| 1903 | 31 days |
| 1904 | 23 days |
| 1905 | 19 days |
| 1906 | 27 days |
| 1907 | 22 days |
| 1908 | 31 days |
| 1909 | 23 days |
| 1910 | 45 days |
| 1911 | 27 days |
| 1912 | 38 days |
| 1913 | 35 days |
| 1914 | 22 days |
| 1915 | 31 days |
| 1916 | 37 days |
| 1917 | 28 days |
| 1918 | 42 days |
| 1919 | 33 days |
| 1920 | 32 days |
| 1921 | 48 days |
| 1922 | 32 days |
| 1923 | 54 days |
| 1924 | 31 days |
| 1925 | 30 days |
| 1926 | 36 days |
| 1927 | 39 days |
| 1928 | 54 days |
| 1929 | 51 days |
| 1930 | 22 days |
| 1931 | 22 days |
| 1932 | 36 days |
| 1933 | 28 days |
| 1934 | 22 days |
| 1935 | 23 days |
| 1936 | 33 days |
| 1937 | 39 days |
| 1938 | 24 days |
| 1939 | 28 days |
| 1940 | 68 days |
| 1941 | 42 days |
| 1942 | 23 days |
| 1943 | 29 days |
| 1944 | 20 days |
| 1945 | 48 days |
| 1946 | 58 days |
| 1947 | 30 days |
| 1948 | 20 days |
| 1949 | 35 days |
| 1950 | 38 days |
| 1951 | 29 days |
| 1952 | 26 days |
| 1953 | 20 days |
| 1954 | 51 days |
| 1955 | 24 days |
| 1956 | 31 days |
| 1957 | 38 days |
| 1958 | 23 days |
| 1959 | 50 days |
| 1960 | 25 days |
| 1961 | 25 days |
| 1962 | 22 days |
| 1963 | 41 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
45 years with a frostAcross 45 years with a frost, the median last spring frost at Fort Simpson falls on 2 June and the median first autumn frost on 1 September, which leaves a median of 86 days between them.
Fitted over all years, the growing season changes by +3.8 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1931 to 1962) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 2 June | n/a | 1 June | n/a | -2.2 days per decade |
| First autumn frost | 1 September | n/a | 1 September | n/a | +1.6 days per decade |
| Growing days | 86 days | n/a | 90 days | n/a | +3.8 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
52 years, 1898 to 1962A day with at least 27.5 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 77.8 mm (3.1 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 27.5 mm (1.1 in) | |
| 5 years | 39.2 mm (1.5 in) | |
| 10 years | 47.6 mm (1.9 in) | |
| 25 years | 59.1 mm (2.3 in) | |
| 50 years | 68.2 mm (2.7 in) | |
| 100 years | 77.8 mm (3.1 in) | Longer than the 52 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, 52 years of values from 1898 to 1962.
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: 86.4 mm (3.4 in) in 1935; 61.5 mm (2.4 in) in 1944; 60.2 mm (2.4 in) in 1960.
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).