Sitka Magnetic Obsy Weather Records (USC00508503)
Record envelope, standing records and threshold days for Sitka Magnetic Obsy (USC00508503), Alaska, United States, with 91 years of record.
Key Facts for Sitka Magnetic Obsy
- Sitka Magnetic Obsy (USC00508503) is a weather station in Alaska, United States at 57.05 latitude and -135.33 longitude, 20 m (67 ft) above sea level.
- The station reports from 1899 to 1989, 91 years of record.
- 1,464 records set at Sitka Magnetic Obsy still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Sitka Magnetic Obsy tied a daily record high minimum temperature of 5.6 C (42.1 F) on 16 December 1989.
About the Station
- Location: Alaska, United States, 57.05 latitude, -135.33 longitude.
- Elevation: 20 m (67 ft).
- Period of record: 1899 to 1989, 91 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
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 | 15.6 C (60.1 F) | -22.2 C (-8.0 F) | n/a | n/a |
| Feb | 17.2 C (63.0 F) | -20.0 C (-4.0 F) | n/a | n/a |
| Mar | 18.3 C (64.9 F) | -20.6 C (-5.1 F) | n/a | n/a |
| Apr | 26.1 C (79.0 F) | -14.4 C (6.1 F) | n/a | n/a |
| May | 29.4 C (84.9 F) | -3.3 C (26.1 F) | n/a | n/a |
| Jun | 30.0 C (86.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Jul | 30.6 C (87.1 F) | 0.6 C (33.1 F) | n/a | n/a |
| Aug | 30.0 C (86.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Sep | 27.8 C (82.0 F) | -2.8 C (27.0 F) | n/a | n/a |
| Oct | 21.1 C (70.0 F) | -10.0 C (14.0 F) | n/a | n/a |
| Nov | 17.8 C (64.0 F) | -19.4 C (-2.9 F) | n/a | n/a |
| Dec | 17.8 C (64.0 F) | -21.1 C (-6.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1899 | 11 |
| 1900 | 17 |
| 1901 | 15 |
| 1902 | 19 |
| 1903 | 22 |
| 1904 | 32 |
| 1905 | 26 |
| 1906 | 17 |
| 1907 | 13 |
| 1908 | 4 |
| 1909 | 6 |
| 1910 | 9 |
| 1911 | 22 |
| 1912 | 22 |
| 1917 | 11 |
| 1918 | 18 |
| 1919 | 13 |
| 1920 | 20 |
| 1921 | 8 |
| 1922 | 16 |
| 1923 | 32 |
| 1924 | 15 |
| 1925 | 25 |
| 1926 | 58 |
| 1927 | 15 |
| 1928 | 18 |
| 1929 | 24 |
| 1930 | 25 |
| 1931 | 19 |
| 1932 | 5 |
| 1933 | 26 |
| 1934 | 24 |
| 1935 | 26 |
| 1936 | 21 |
| 1937 | 16 |
| 1938 | 26 |
| 1939 | 13 |
| 1940 | 19 |
| 1941 | 25 |
| 1942 | 16 |
| 1943 | 12 |
| 1944 | 10 |
| 1945 | 8 |
| 1946 | 9 |
| 1947 | 21 |
| 1948 | 12 |
| 1949 | 26 |
| 1950 | 22 |
| 1951 | 10 |
| 1952 | 9 |
| 1953 | 13 |
| 1954 | 32 |
| 1955 | 36 |
| 1956 | 21 |
| 1957 | 15 |
| 1958 | 13 |
| 1959 | 6 |
| 1960 | 7 |
| 1961 | 9 |
| 1962 | 10 |
| 1963 | 23 |
| 1964 | 18 |
| 1965 | 24 |
| 1966 | 10 |
| 1967 | 8 |
| 1968 | 19 |
| 1969 | 18 |
| 1970 | 28 |
| 1971 | 26 |
| 1972 | 35 |
| 1973 | 17 |
| 1974 | 7 |
| 1975 | 17 |
| 1976 | 19 |
| 1977 | 22 |
| 1978 | 7 |
| 1979 | 10 |
| 1980 | 10 |
| 1981 | 22 |
| 1982 | 7 |
| 1983 | 7 |
| 1984 | 5 |
| 1985 | 13 |
| 1986 | 6 |
| 1987 | 9 |
| 1988 | 2 |
| 1989 | 5 |
All-Time Record Progression
6 new records| Date | Kind | Detail |
|---|---|---|
| 1945-09-12 | Record daily precipitation | Record daily precipitation 136.7 mm (5.4 in) |
| 1947-01-30 | Record low maximum temperature | Record low maximum temperature -16.1 C (3.0 F) |
| 1947-01-30 | Record low minimum temperature | Record low minimum temperature -22.2 C (-8.0 F) |
| 1961-08-12 | Record daily precipitation | Record daily precipitation 141.0 mm (5.6 in) |
| 1970-09-29 | Record daily precipitation | Record daily precipitation 152.4 mm (6.0 in) |
| 1979-08-22 | Record high minimum temperature | Record high minimum temperature 17.8 C (64.0 F) |
Wettest Day of Each Month
Sep: 152.4 mm (6.0 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 126.2 mm (5.0 in) | 15 January 1965 |
| Feb | 108.0 mm (4.3 in) | 19 February 1988 |
| Mar | 103.1 mm (4.1 in) | 7 March 1962 |
| Apr | 83.6 mm (3.3 in) | 2 April 1906 |
| May | 78.5 mm (3.1 in) | 12 May 1952 |
| Jun | 54.1 mm (2.1 in) | 21 June 1965 |
| Jul | 112.3 mm (4.4 in) | 13 July 1935 |
| Aug | 141.0 mm (5.6 in) | 12 August 1961 |
| Sep | 152.4 mm (6.0 in) | 29 September 1970 |
| Oct | 144.3 mm (5.7 in) | 6 October 1972 |
| Nov | 112.0 mm (4.4 in) | 21 November 1929 |
| Dec | 97.3 mm (3.8 in) | 18 December 1985 |
Period of Record Coverage
1899 to 1989| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1899 | 234 | 64% | No |
| 1900 | 362 | 99% | Yes |
| 1901 | 337 | 92% | Yes |
| 1902 | 364 | 100% | Yes |
| 1903 | 357 | 98% | Yes |
| 1904 | 365 | 100% | Yes |
| 1905 | 364 | 100% | Yes |
| 1906 | 363 | 99% | Yes |
| 1907 | 365 | 100% | Yes |
| 1908 | 182 | 50% | No |
| 1909 | 244 | 67% | No |
| 1910 | 211 | 58% | No |
| 1911 | 334 | 92% | Yes |
| 1912 | 152 | 42% | No |
| 1917 | 245 | 67% | No |
| 1918 | 365 | 100% | Yes |
| 1919 | 365 | 100% | Yes |
| 1920 | 366 | 100% | Yes |
| 1921 | 365 | 100% | Yes |
| 1922 | 365 | 100% | Yes |
| 1923 | 365 | 100% | Yes |
| 1924 | 336 | 92% | Yes |
| 1925 | 365 | 100% | Yes |
| 1926 | 363 | 99% | Yes |
| 1927 | 363 | 99% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 365 | 100% | Yes |
| 1930 | 334 | 92% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 348 | 95% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 335 | 92% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 353 | 97% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 364 | 100% | Yes |
| 1948 | 244 | 67% | No |
| 1949 | 365 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 363 | 99% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 364 | 100% | Yes |
| 1956 | 364 | 99% | Yes |
| 1957 | 361 | 99% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 333 | 91% | Yes |
| 1960 | 350 | 96% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 364 | 99% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 365 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 365 | 100% | Yes |
| 1977 | 359 | 98% | Yes |
| 1978 | 319 | 87% | No |
| 1979 | 357 | 98% | Yes |
| 1980 | 363 | 99% | Yes |
| 1981 | 356 | 98% | Yes |
| 1982 | 364 | 100% | Yes |
| 1983 | 360 | 99% | Yes |
| 1984 | 355 | 97% | Yes |
| 1985 | 362 | 99% | Yes |
| 1986 | 360 | 99% | Yes |
| 1987 | 357 | 98% | Yes |
| 1988 | 356 | 97% | Yes |
| 1989 | 349 | 96% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 16 December 1989 | Sitka Magnetic Obsy, US | daily high min (Tie) | 5.6 C (42.1 F) | tie | 27 years | 4 of 100 (Routine) |
| 13 December 1989 | Sitka Magnetic Obsy, US | daily rain (Tie) | 36.8 mm (1.4 in) | tie | 51 years | 6 of 100 (Routine) |
| 2 December 1989 | Sitka Magnetic Obsy, US | daily high min | 6.7 C (44.1 F) | 1.7 C (3.1 F) | 84 years | 37 of 100 (Notable) |
| 2 December 1989 | Sitka Magnetic Obsy, US | daily high max (Tie) | 11.1 C (52.0 F) | tie | 26 years | 4 of 100 (Routine) |
| 11 November 1989 | Sitka Magnetic Obsy, US | daily snowfall | 8.9 cm (3.5 in) | 7.6 cm (3.0 in) | 12 years | 27 of 100 (Routine) |
| 11 November 1989 | Sitka Magnetic Obsy, US | daily snow depth | 20.3 cm (8.0 in) | 5.1 cm (2.0 in) | 14 years | 18 of 100 (Routine) |
| 9 November 1989 | Sitka Magnetic Obsy, US | daily snowfall | 4.6 cm (1.8 in) | 2.1 cm (0.8 in) | 14 years | 17 of 100 (Routine) |
| 10 October 1989 | Sitka Magnetic Obsy, US | daily low max | 7.2 C (45.0 F) | 0.6 C (1.1 F) | 68 years | 31 of 100 (Routine) |
| 22 September 1989 | Sitka Magnetic Obsy, US | daily high min (Tie) | 12.2 C (54.0 F) | tie | 42 years | 5 of 100 (Routine) |
| 17 September 1989 | Sitka Magnetic Obsy, US | daily low min (Tie) | 0.0 C (32.0 F) | tie | 6 years | 2 of 100 (Routine) |
| 29 July 1989 | Sitka Magnetic Obsy, US | daily high min (Tie) | 12.8 C (55.0 F) | tie | 62 years | 6 of 100 (Routine) |
| 11 July 1989 | Sitka Magnetic Obsy, US | daily high max (Tie) | 22.2 C (72.0 F) | tie | 36 years | 5 of 100 (Routine) |
| 30 May 1989 | Sitka Magnetic Obsy, US | daily high min (Tie) | 9.4 C (48.9 F) | tie | 8 years | 2 of 100 (Routine) |
| 2 May 1989 | Sitka Magnetic Obsy, US | daily high max | 20.0 C (68.0 F) | 0.6 C (1.1 F) | 60 years | 28 of 100 (Routine) |
| 1 May 1989 | Sitka Magnetic Obsy, US | daily high max | 22.8 C (73.0 F) | 2.8 C (5.0 F) | 56 years | 34 of 100 (Routine) |
| 20 April 1989 | Sitka Magnetic Obsy, US | daily high min (Tie) | 6.7 C (44.1 F) | tie | 55 years | 6 of 100 (Routine) |
| 19 April 1989 | Sitka Magnetic Obsy, US | daily high max | 16.1 C (61.0 F) | 1.1 C (2.0 F) | 22 years | 18 of 100 (Routine) |
| 3 March 1989 | Sitka Magnetic Obsy, US | daily snowfall | 25.4 cm (10.0 in) | 10.2 cm (4.0 in) | 18 years | 34 of 100 (Routine) |
| 31 January 1989 | Sitka Magnetic Obsy, US | daily low max (Tie) | -12.2 C (10.0 F) | tie | 42 years | 5 of 100 (Routine) |
| 25 January 1989 | Sitka Magnetic Obsy, US | daily rain | 54.9 mm (2.2 in) | 5.4 mm (0.21 in) | 3 years | 13 of 100 (Routine) |
Climate Trend
71 complete years, 1900 to 1988| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1900 | 6.4 C | +0.13 C |
| 1902 | 6.4 C | +0.08 C |
| 1903 | 6.4 C | +0.12 C |
| 1904 | 5.4 C | -0.91 C |
| 1905 | 7.6 C | +1.27 C |
| 1906 | 6.4 C | +0.15 C |
| 1907 | 6.1 C | -0.19 C |
| 1918 | 6.3 C | -0.04 C |
| 1919 | 6.3 C | -0.01 C |
| 1920 | 6.0 C | -0.30 C |
| 1921 | 6.4 C | +0.10 C |
| 1922 | 6.4 C | +0.12 C |
| 1923 | 7.8 C | +1.49 C |
| 1925 | 7.0 C | +0.75 C |
| 1926 | 9.1 C | +2.77 C |
| 1927 | 6.8 C | +0.54 C |
| 1928 | 6.8 C | +0.50 C |
| 1929 | 6.4 C | +0.14 C |
| 1931 | 7.7 C | +1.41 C |
| 1933 | 5.3 C | -1.01 C |
| 1934 | 7.3 C | +0.97 C |
| 1935 | 6.8 C | +0.54 C |
| 1937 | 6.5 C | +0.21 C |
| 1938 | 6.6 C | +0.33 C |
| 1939 | 6.6 C | +0.30 C |
| 1940 | 8.0 C | +1.72 C |
| 1941 | 7.9 C | +1.65 C |
| 1942 | 7.5 C | +1.20 C |
| 1943 | 6.4 C | +0.14 C |
| 1944 | 6.7 C | +0.41 C |
| 1945 | 6.2 C | -0.06 C |
| 1946 | 6.0 C | -0.27 C |
| 1947 | 6.5 C | +0.16 C |
| 1949 | 5.4 C | -0.89 C |
| 1950 | 4.7 C | -1.62 C |
| 1951 | 5.2 C | -1.09 C |
| 1952 | 5.9 C | -0.39 C |
| 1953 | 6.2 C | -0.10 C |
| 1954 | 5.2 C | -1.11 C |
| 1955 | 4.5 C | -1.75 C |
| 1956 | 5.1 C | -1.23 C |
| 1957 | 6.4 C | +0.10 C |
| 1958 | 6.7 C | +0.45 C |
| 1960 | 6.5 C | +0.24 C |
| 1961 | 6.1 C | -0.23 C |
| 1962 | 6.1 C | -0.18 C |
| 1963 | 6.6 C | +0.30 C |
| 1964 | 5.4 C | -0.93 C |
| 1965 | 5.3 C | -0.95 C |
| 1966 | 5.2 C | -1.09 C |
| 1967 | 5.8 C | -0.46 C |
| 1968 | 5.7 C | -0.63 C |
| 1969 | 5.6 C | -0.70 C |
| 1970 | 5.6 C | -0.74 C |
| 1971 | 4.7 C | -1.56 C |
| 1972 | 4.5 C | -1.79 C |
| 1973 | 5.3 C | -1.02 C |
| 1974 | 5.9 C | -0.41 C |
| 1975 | 5.2 C | -1.05 C |
| 1976 | 6.6 C | +0.35 C |
| 1977 | 6.7 C | +0.38 C |
| 1979 | 6.6 C | +0.35 C |
| 1980 | 6.8 C | +0.46 C |
| 1981 | 7.7 C | +1.41 C |
| 1982 | 5.7 C | -0.58 C |
| 1983 | 6.8 C | +0.55 C |
| 1984 | 6.7 C | +0.42 C |
| 1985 | 5.7 C | -0.58 C |
| 1986 | 6.9 C | +0.56 C |
| 1987 | 7.0 C | +0.73 C |
| 1988 | 6.6 C | +0.26 C |
The annual mean temperature here has fallen by 0.09 C (0.00 to 0.17) per decade over 1900 to 1988. In Fahrenheit: 0.15 F (0.01 to 0.30) per decade. The slope is a straight line fitted to 71 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.09 C (-0.17 to 0.00) per decade | -0.15 F (-0.30 to -0.01) per decade | 1900 to 1988 | 71 | Fall |
| Mean daily maximum | -0.05 C (-0.14 to 0.03) per decade | -0.1 F (-0.3 to 0.1) per decade | 1900 to 1988 | 71 | Not clearly different from zero |
| Mean daily minimum | -0.12 C (-0.20 to -0.03) per decade | -0.2 F (-0.4 to -0.1) per decade | 1900 to 1988 | 71 | Fall |
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
1899 to 1989| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 30.6 C (87.1 F) | 1899 | 25.0 C (77.0 F) | 87 |
| Coldest night (TNn) | -22.2 C (-8.0 F) | 1947 | -14.4 C (6.1 F) | 87 |
| Wettest day (Rx1day) | 152.4 mm (6.0 in) | 1970 | 78.7 mm (3.1 in) | 87 |
| Wettest five days (Rx5day) | 288.1 mm (11.3 in) | 1961 | 170.2 mm (6.7 in) | 87 |
| Longest dry spell (CDD) | 22 days | 1934 | 11 days | 87 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1899 | 30.6 C (87.1 F) |
| 1900 | 21.7 C (71.1 F) |
| 1901 | 23.3 C (73.9 F) |
| 1902 | 25.0 C (77.0 F) |
| 1903 | 25.0 C (77.0 F) |
| 1904 | 21.7 C (71.1 F) |
| 1905 | 28.9 C (84.0 F) |
| 1906 | 23.9 C (75.0 F) |
| 1907 | 25.0 C (77.0 F) |
| 1908 | 18.9 C (66.0 F) |
| 1909 | 24.4 C (75.9 F) |
| 1910 | 26.7 C (80.1 F) |
| 1911 | 29.4 C (84.9 F) |
| 1912 | 26.7 C (80.1 F) |
| 1917 | 23.3 C (73.9 F) |
| 1918 | 25.6 C (78.1 F) |
| 1919 | 23.3 C (73.9 F) |
| 1920 | 25.0 C (77.0 F) |
| 1921 | 25.0 C (77.0 F) |
| 1922 | 25.0 C (77.0 F) |
| 1923 | 27.2 C (81.0 F) |
| 1924 | 26.7 C (80.1 F) |
| 1925 | 26.1 C (79.0 F) |
| 1926 | 25.6 C (78.1 F) |
| 1927 | 25.0 C (77.0 F) |
| 1928 | 25.6 C (78.1 F) |
| 1929 | 30.0 C (86.0 F) |
| 1930 | 27.2 C (81.0 F) |
| 1931 | 25.6 C (78.1 F) |
| 1932 | 21.1 C (70.0 F) |
| 1933 | 23.9 C (75.0 F) |
| 1934 | 27.8 C (82.0 F) |
| 1935 | 21.1 C (70.0 F) |
| 1936 | 25.0 C (77.0 F) |
| 1937 | 27.8 C (82.0 F) |
| 1938 | 25.6 C (78.1 F) |
| 1939 | 20.0 C (68.0 F) |
| 1940 | 24.4 C (75.9 F) |
| 1941 | 25.0 C (77.0 F) |
| 1942 | 26.1 C (79.0 F) |
| 1943 | 23.3 C (73.9 F) |
| 1944 | 21.7 C (71.1 F) |
| 1945 | 22.2 C (72.0 F) |
| 1946 | 26.7 C (80.1 F) |
| 1947 | 30.0 C (86.0 F) |
| 1948 | 27.2 C (81.0 F) |
| 1949 | 22.8 C (73.0 F) |
| 1950 | 23.9 C (75.0 F) |
| 1951 | 23.3 C (73.9 F) |
| 1952 | 25.6 C (78.1 F) |
| 1953 | 23.3 C (73.9 F) |
| 1954 | 25.6 C (78.1 F) |
| 1955 | 21.1 C (70.0 F) |
| 1956 | 25.6 C (78.1 F) |
| 1957 | 27.8 C (82.0 F) |
| 1958 | 26.1 C (79.0 F) |
| 1959 | 23.3 C (73.9 F) |
| 1960 | 27.2 C (81.0 F) |
| 1961 | 22.8 C (73.0 F) |
| 1962 | 24.4 C (75.9 F) |
| 1963 | 29.4 C (84.9 F) |
| 1964 | 28.3 C (82.9 F) |
| 1965 | 25.0 C (77.0 F) |
| 1966 | 23.9 C (75.0 F) |
| 1967 | 23.3 C (73.9 F) |
| 1968 | 27.2 C (81.0 F) |
| 1969 | 27.8 C (82.0 F) |
| 1970 | 28.9 C (84.0 F) |
| 1971 | 26.1 C (79.0 F) |
| 1972 | 25.6 C (78.1 F) |
| 1973 | 27.2 C (81.0 F) |
| 1974 | 25.0 C (77.0 F) |
| 1975 | 29.4 C (84.9 F) |
| 1976 | 30.6 C (87.1 F) |
| 1977 | 23.9 C (75.0 F) |
| 1978 | 25.0 C (77.0 F) |
| 1979 | 22.8 C (73.0 F) |
| 1980 | 30.0 C (86.0 F) |
| 1981 | 25.0 C (77.0 F) |
| 1982 | 23.3 C (73.9 F) |
| 1983 | 23.9 C (75.0 F) |
| 1984 | 22.8 C (73.0 F) |
| 1985 | 26.7 C (80.1 F) |
| 1986 | 24.4 C (75.9 F) |
| 1987 | 25.0 C (77.0 F) |
| 1988 | 23.3 C (73.9 F) |
| 1989 | 23.9 C (75.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1899 | -4.4 C (24.1 F) |
| 1900 | -18.3 C (-0.9 F) |
| 1901 | -8.3 C (17.1 F) |
| 1902 | -13.9 C (7.0 F) |
| 1903 | -12.2 C (10.0 F) |
| 1904 | -15.0 C (5.0 F) |
| 1905 | -7.2 C (19.0 F) |
| 1906 | -18.9 C (-2.0 F) |
| 1907 | -13.9 C (7.0 F) |
| 1908 | -7.8 C (18.0 F) |
| 1909 | -12.2 C (10.0 F) |
| 1910 | -10.6 C (12.9 F) |
| 1911 | -15.6 C (3.9 F) |
| 1912 | -8.9 C (16.0 F) |
| 1917 | -15.6 C (3.9 F) |
| 1918 | -12.8 C (9.0 F) |
| 1919 | -13.9 C (7.0 F) |
| 1920 | -14.4 C (6.1 F) |
| 1921 | -12.2 C (10.0 F) |
| 1922 | -13.3 C (8.1 F) |
| 1923 | -12.2 C (10.0 F) |
| 1924 | -14.4 C (6.1 F) |
| 1925 | -13.9 C (7.0 F) |
| 1926 | -7.2 C (19.0 F) |
| 1927 | -11.1 C (12.0 F) |
| 1928 | -10.6 C (12.9 F) |
| 1929 | -15.0 C (5.0 F) |
| 1930 | -15.6 C (3.9 F) |
| 1931 | -11.7 C (10.9 F) |
| 1932 | -11.1 C (12.0 F) |
| 1933 | -20.6 C (-5.1 F) |
| 1934 | -17.2 C (1.0 F) |
| 1935 | -12.8 C (9.0 F) |
| 1936 | -7.8 C (18.0 F) |
| 1937 | -12.2 C (10.0 F) |
| 1938 | -13.3 C (8.1 F) |
| 1939 | -15.0 C (5.0 F) |
| 1940 | -11.7 C (10.9 F) |
| 1941 | -12.2 C (10.0 F) |
| 1942 | -9.4 C (15.1 F) |
| 1943 | -17.8 C (0.0 F) |
| 1944 | -11.7 C (10.9 F) |
| 1945 | -10.6 C (12.9 F) |
| 1946 | -10.6 C (12.9 F) |
| 1947 | -22.2 C (-8.0 F) |
| 1948 | -16.1 C (3.0 F) |
| 1949 | -21.1 C (-6.0 F) |
| 1950 | -20.6 C (-5.1 F) |
| 1951 | -18.3 C (-0.9 F) |
| 1952 | -18.3 C (-0.9 F) |
| 1953 | -18.3 C (-0.9 F) |
| 1954 | -18.9 C (-2.0 F) |
| 1955 | -20.6 C (-5.1 F) |
| 1956 | -18.9 C (-2.0 F) |
| 1957 | -14.4 C (6.1 F) |
| 1958 | -13.3 C (8.1 F) |
| 1959 | -13.9 C (7.0 F) |
| 1960 | -8.9 C (16.0 F) |
| 1961 | -12.2 C (10.0 F) |
| 1962 | -12.8 C (9.0 F) |
| 1963 | -16.7 C (1.9 F) |
| 1964 | -20.0 C (-4.0 F) |
| 1965 | -20.0 C (-4.0 F) |
| 1966 | -19.4 C (-2.9 F) |
| 1967 | -14.4 C (6.1 F) |
| 1968 | -20.0 C (-4.0 F) |
| 1969 | -19.4 C (-2.9 F) |
| 1970 | -19.4 C (-2.9 F) |
| 1971 | -18.3 C (-0.9 F) |
| 1972 | -18.9 C (-2.0 F) |
| 1973 | -12.2 C (10.0 F) |
| 1974 | -18.9 C (-2.0 F) |
| 1975 | -20.0 C (-4.0 F) |
| 1976 | -13.3 C (8.1 F) |
| 1977 | -18.9 C (-2.0 F) |
| 1978 | -15.0 C (5.0 F) |
| 1979 | -18.3 C (-0.9 F) |
| 1980 | -15.0 C (5.0 F) |
| 1981 | -12.8 C (9.0 F) |
| 1982 | -14.4 C (6.1 F) |
| 1983 | -11.1 C (12.0 F) |
| 1984 | -15.0 C (5.0 F) |
| 1985 | -19.4 C (-2.9 F) |
| 1986 | -16.1 C (3.0 F) |
| 1987 | -12.2 C (10.0 F) |
| 1988 | -11.7 C (10.9 F) |
| 1989 | -17.2 C (1.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1899 | 50.8 mm (2.0 in) |
| 1900 | 66.5 mm (2.6 in) |
| 1901 | 88.4 mm (3.5 in) |
| 1902 | 84.1 mm (3.3 in) |
| 1903 | 68.1 mm (2.7 in) |
| 1904 | 66.8 mm (2.6 in) |
| 1905 | 48.3 mm (1.9 in) |
| 1906 | 83.6 mm (3.3 in) |
| 1907 | 126.5 mm (5.0 in) |
| 1908 | 64.0 mm (2.5 in) |
| 1909 | 49.0 mm (1.9 in) |
| 1910 | 60.5 mm (2.4 in) |
| 1911 | 51.8 mm (2.0 in) |
| 1912 | 37.8 mm (1.5 in) |
| 1917 | 70.6 mm (2.8 in) |
| 1918 | 95.3 mm (3.8 in) |
| 1919 | 75.7 mm (3.0 in) |
| 1920 | 104.1 mm (4.1 in) |
| 1921 | 94.5 mm (3.7 in) |
| 1922 | 75.2 mm (3.0 in) |
| 1923 | 95.0 mm (3.7 in) |
| 1924 | 76.5 mm (3.0 in) |
| 1925 | 56.9 mm (2.2 in) |
| 1926 | 70.6 mm (2.8 in) |
| 1927 | 95.0 mm (3.7 in) |
| 1928 | 118.4 mm (4.7 in) |
| 1929 | 112.0 mm (4.4 in) |
| 1930 | 63.5 mm (2.5 in) |
| 1931 | 53.3 mm (2.1 in) |
| 1932 | 53.3 mm (2.1 in) |
| 1933 | 53.3 mm (2.1 in) |
| 1934 | 63.5 mm (2.5 in) |
| 1935 | 112.3 mm (4.4 in) |
| 1936 | 93.7 mm (3.7 in) |
| 1937 | 112.5 mm (4.4 in) |
| 1938 | 75.7 mm (3.0 in) |
| 1939 | 107.4 mm (4.2 in) |
| 1940 | 66.8 mm (2.6 in) |
| 1941 | 77.5 mm (3.1 in) |
| 1942 | 33.0 mm (1.3 in) |
| 1943 | 73.4 mm (2.9 in) |
| 1944 | 67.1 mm (2.6 in) |
| 1945 | 136.7 mm (5.4 in) |
| 1946 | 108.5 mm (4.3 in) |
| 1947 | 94.2 mm (3.7 in) |
| 1948 | 90.2 mm (3.6 in) |
| 1949 | 110.0 mm (4.3 in) |
| 1950 | 59.4 mm (2.3 in) |
| 1951 | 45.2 mm (1.8 in) |
| 1952 | 94.2 mm (3.7 in) |
| 1953 | 60.2 mm (2.4 in) |
| 1954 | 90.4 mm (3.6 in) |
| 1955 | 83.6 mm (3.3 in) |
| 1956 | 79.2 mm (3.1 in) |
| 1957 | 85.1 mm (3.4 in) |
| 1958 | 88.4 mm (3.5 in) |
| 1959 | 57.7 mm (2.3 in) |
| 1960 | 84.1 mm (3.3 in) |
| 1961 | 141.0 mm (5.6 in) |
| 1962 | 103.1 mm (4.1 in) |
| 1963 | 78.7 mm (3.1 in) |
| 1964 | 56.1 mm (2.2 in) |
| 1965 | 126.2 mm (5.0 in) |
| 1966 | 60.5 mm (2.4 in) |
| 1967 | 67.6 mm (2.7 in) |
| 1968 | 112.0 mm (4.4 in) |
| 1969 | 61.0 mm (2.4 in) |
| 1970 | 152.4 mm (6.0 in) |
| 1971 | 81.3 mm (3.2 in) |
| 1972 | 144.3 mm (5.7 in) |
| 1973 | 46.0 mm (1.8 in) |
| 1974 | 99.8 mm (3.9 in) |
| 1975 | 63.8 mm (2.5 in) |
| 1976 | 70.6 mm (2.8 in) |
| 1977 | 64.0 mm (2.5 in) |
| 1978 | 102.6 mm (4.0 in) |
| 1979 | 129.8 mm (5.1 in) |
| 1980 | 67.1 mm (2.6 in) |
| 1981 | 95.0 mm (3.7 in) |
| 1982 | 108.7 mm (4.3 in) |
| 1983 | 64.3 mm (2.5 in) |
| 1984 | 102.1 mm (4.0 in) |
| 1985 | 97.3 mm (3.8 in) |
| 1986 | 86.1 mm (3.4 in) |
| 1987 | 66.3 mm (2.6 in) |
| 1988 | 108.0 mm (4.3 in) |
| 1989 | 70.9 mm (2.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1899 | 124.0 mm (4.9 in) |
| 1900 | 143.3 mm (5.6 in) |
| 1901 | 128.0 mm (5.0 in) |
| 1902 | 149.1 mm (5.9 in) |
| 1903 | 137.0 mm (5.4 in) |
| 1904 | 124.3 mm (4.9 in) |
| 1905 | 103.7 mm (4.1 in) |
| 1906 | 180.1 mm (7.1 in) |
| 1907 | 185.7 mm (7.3 in) |
| 1908 | 118.6 mm (4.7 in) |
| 1909 | 163.8 mm (6.4 in) |
| 1910 | 99.0 mm (3.9 in) |
| 1911 | 106.5 mm (4.2 in) |
| 1912 | 94.2 mm (3.7 in) |
| 1917 | 152.3 mm (6.0 in) |
| 1918 | 182.6 mm (7.2 in) |
| 1919 | 203.5 mm (8.0 in) |
| 1920 | 150.4 mm (5.9 in) |
| 1921 | 162.9 mm (6.4 in) |
| 1922 | 121.1 mm (4.8 in) |
| 1923 | 207.8 mm (8.2 in) |
| 1924 | 162.3 mm (6.4 in) |
| 1925 | 134.9 mm (5.3 in) |
| 1926 | 170.2 mm (6.7 in) |
| 1927 | 242.6 mm (9.6 in) |
| 1928 | 245.7 mm (9.7 in) |
| 1929 | 182.2 mm (7.2 in) |
| 1930 | 145.1 mm (5.7 in) |
| 1931 | 171.0 mm (6.7 in) |
| 1932 | 119.7 mm (4.7 in) |
| 1933 | 204.4 mm (8.0 in) |
| 1934 | 254.0 mm (10.0 in) |
| 1935 | 171.9 mm (6.8 in) |
| 1936 | 209.0 mm (8.2 in) |
| 1937 | 261.9 mm (10.3 in) |
| 1938 | 172.2 mm (6.8 in) |
| 1939 | 211.9 mm (8.3 in) |
| 1940 | 169.7 mm (6.7 in) |
| 1941 | 165.9 mm (6.5 in) |
| 1942 | 91.2 mm (3.6 in) |
| 1943 | 222.7 mm (8.8 in) |
| 1944 | 119.6 mm (4.7 in) |
| 1945 | 186.8 mm (7.4 in) |
| 1946 | 209.2 mm (8.2 in) |
| 1947 | 201.9 mm (7.9 in) |
| 1948 | 175.0 mm (6.9 in) |
| 1949 | 237.2 mm (9.3 in) |
| 1950 | 106.4 mm (4.2 in) |
| 1951 | 98.3 mm (3.9 in) |
| 1952 | 225.6 mm (8.9 in) |
| 1953 | 181.3 mm (7.1 in) |
| 1954 | 165.8 mm (6.5 in) |
| 1955 | 153.9 mm (6.1 in) |
| 1956 | 172.5 mm (6.8 in) |
| 1957 | 200.2 mm (7.9 in) |
| 1958 | 186.2 mm (7.3 in) |
| 1959 | 130.6 mm (5.1 in) |
| 1960 | 162.5 mm (6.4 in) |
| 1961 | 288.1 mm (11.3 in) |
| 1962 | 137.5 mm (5.4 in) |
| 1963 | 228.3 mm (9.0 in) |
| 1964 | 142.0 mm (5.6 in) |
| 1965 | 218.4 mm (8.6 in) |
| 1966 | 164.1 mm (6.5 in) |
| 1967 | 154.2 mm (6.1 in) |
| 1968 | 189.3 mm (7.5 in) |
| 1969 | 163.6 mm (6.4 in) |
| 1970 | 231.1 mm (9.1 in) |
| 1971 | 208.8 mm (8.2 in) |
| 1972 | 249.3 mm (9.8 in) |
| 1973 | 127.8 mm (5.0 in) |
| 1974 | 222.6 mm (8.8 in) |
| 1975 | 140.8 mm (5.5 in) |
| 1976 | 181.3 mm (7.1 in) |
| 1977 | 158.7 mm (6.2 in) |
| 1978 | 218.5 mm (8.6 in) |
| 1979 | 217.6 mm (8.6 in) |
| 1980 | 162.9 mm (6.4 in) |
| 1981 | 207.2 mm (8.2 in) |
| 1982 | 154.1 mm (6.1 in) |
| 1983 | 171.7 mm (6.8 in) |
| 1984 | 151.7 mm (6.0 in) |
| 1985 | 155.0 mm (6.1 in) |
| 1986 | 212.0 mm (8.3 in) |
| 1987 | 171.7 mm (6.8 in) |
| 1988 | 207.3 mm (8.2 in) |
| 1989 | 143.5 mm (5.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1899 | 3 days |
| 1900 | 5 days |
| 1901 | 2 days |
| 1902 | 3 days |
| 1903 | 3 days |
| 1904 | 8 days |
| 1905 | 13 days |
| 1906 | 8 days |
| 1907 | 7 days |
| 1908 | 10 days |
| 1909 | 10 days |
| 1910 | 14 days |
| 1911 | 10 days |
| 1912 | 13 days |
| 1917 | 13 days |
| 1918 | 13 days |
| 1919 | 8 days |
| 1920 | 10 days |
| 1921 | 13 days |
| 1922 | 17 days |
| 1923 | 13 days |
| 1924 | 4 days |
| 1925 | 7 days |
| 1926 | 3 days |
| 1927 | 10 days |
| 1928 | 15 days |
| 1929 | 13 days |
| 1930 | 10 days |
| 1931 | 9 days |
| 1932 | 15 days |
| 1933 | 17 days |
| 1934 | 22 days |
| 1935 | 9 days |
| 1936 | 22 days |
| 1937 | 15 days |
| 1938 | 2 days |
| 1939 | 3 days |
| 1940 | 2 days |
| 1941 | 4 days |
| 1942 | 5 days |
| 1943 | 16 days |
| 1944 | 11 days |
| 1945 | 2 days |
| 1946 | 2 days |
| 1947 | 3 days |
| 1948 | 7 days |
| 1949 | 14 days |
| 1950 | 16 days |
| 1951 | 14 days |
| 1952 | 9 days |
| 1953 | 11 days |
| 1954 | 14 days |
| 1955 | 17 days |
| 1956 | 20 days |
| 1957 | 21 days |
| 1958 | 19 days |
| 1959 | 9 days |
| 1960 | 11 days |
| 1961 | 20 days |
| 1962 | 16 days |
| 1963 | 8 days |
| 1964 | 8 days |
| 1965 | 15 days |
| 1966 | 11 days |
| 1967 | 19 days |
| 1968 | 14 days |
| 1969 | 14 days |
| 1970 | 9 days |
| 1971 | 11 days |
| 1972 | 14 days |
| 1973 | 11 days |
| 1974 | 14 days |
| 1975 | 14 days |
| 1976 | 10 days |
| 1977 | 10 days |
| 1978 | 10 days |
| 1979 | 18 days |
| 1980 | 13 days |
| 1981 | 12 days |
| 1982 | 18 days |
| 1983 | 15 days |
| 1984 | 9 days |
| 1985 | 18 days |
| 1986 | 11 days |
| 1987 | 10 days |
| 1988 | 10 days |
| 1989 | 21 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
71 years with a frostAcross 71 years with a frost, the median last spring frost at Sitka Magnetic Obsy falls on 15 May and the median first autumn frost on 14 October, which leaves a median of 152 days between them.
In 1957 to 1988 the median growing season was 150 days. That is 16 days fewer than in 1900 to 1944.
Fitted over all years, the growing season changes by -2.4 days per decade at this station.
| Measure | Median, all years | Earliest period (1900 to 1944) | Recent period (1957 to 1988) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 15 May | 5 May | 16 May | 11 days later | +1.2 days per decade |
| First autumn frost | 14 October | 18 October | 9 October | 9 days earlier | -1.3 days per decade |
| Growing days | 152 days | 166 days | 150 days | 16 days fewer | -2.4 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, 1911 to 1989A day with at least 80.7 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 168.1 mm (6.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 80.7 mm (3.2 in) | |
| 5 years | 105.4 mm (4.1 in) | |
| 10 years | 121.2 mm (4.8 in) | |
| 25 years | 140.6 mm (5.5 in) | |
| 50 years | 154.6 mm (6.1 in) | |
| 100 years | 168.1 mm (6.6 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 1911 to 1989.
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: 152.4 mm (6.0 in) in 1970; 144.3 mm (5.7 in) in 1972; 141.0 mm (5.6 in) in 1961.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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 (2025-12-31).