Vashon Island Weather Records (USC00458802)
Record envelope, standing records and threshold days for Vashon Island (USC00458802), Washington, United States, with 65 years of record.
Key Facts for Vashon Island
- Vashon Island (USC00458802) is a weather station in Washington, United States at 47.45 latitude and -122.50 longitude, 70 m (230 ft) above sea level.
- The station reports from 1891 to 1955, 65 years of record.
- 1,464 records set at Vashon Island still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Vashon Island set a daily record low minimum temperature of -2.8 C (27.0 F) on 27 February 1955.
About the Station
- Location: Washington, United States, 47.45 latitude, -122.50 longitude.
- Elevation: 70 m (230 ft).
- Period of record: 1891 to 1955, 65 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 | 18.9 C (66.0 F) | -13.3 C (8.1 F) | n/a | n/a |
| Feb | 20.6 C (69.1 F) | -12.8 C (9.0 F) | n/a | n/a |
| Mar | 25.6 C (78.1 F) | -6.1 C (21.0 F) | n/a | n/a |
| Apr | 29.4 C (84.9 F) | -3.9 C (25.0 F) | n/a | n/a |
| May | 31.1 C (88.0 F) | -1.7 C (28.9 F) | n/a | n/a |
| Jun | 35.0 C (95.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Jul | 35.6 C (96.1 F) | 3.3 C (37.9 F) | n/a | n/a |
| Aug | 36.7 C (98.1 F) | 4.4 C (39.9 F) | n/a | n/a |
| Sep | 33.9 C (93.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Oct | 28.3 C (82.9 F) | -6.1 C (21.0 F) | n/a | n/a |
| Nov | 25.6 C (78.1 F) | -7.8 C (18.0 F) | n/a | n/a |
| Dec | 17.8 C (64.0 F) | -13.9 C (7.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1891 | 25 |
| 1892 | 44 |
| 1898 | 23 |
| 1899 | 34 |
| 1900 | 27 |
| 1901 | 25 |
| 1902 | 15 |
| 1903 | 21 |
| 1904 | 17 |
| 1905 | 23 |
| 1906 | 42 |
| 1907 | 15 |
| 1908 | 21 |
| 1909 | 31 |
| 1910 | 19 |
| 1911 | 22 |
| 1912 | 19 |
| 1913 | 12 |
| 1915 | 19 |
| 1916 | 44 |
| 1917 | 52 |
| 1918 | 36 |
| 1919 | 56 |
| 1920 | 26 |
| 1921 | 25 |
| 1922 | 51 |
| 1923 | 34 |
| 1924 | 50 |
| 1925 | 8 |
| 1926 | 38 |
| 1927 | 18 |
| 1928 | 20 |
| 1929 | 13 |
| 1931 | 26 |
| 1932 | 10 |
| 1933 | 19 |
| 1934 | 22 |
| 1935 | 39 |
| 1936 | 30 |
| 1937 | 26 |
| 1938 | 14 |
| 1939 | 16 |
| 1940 | 18 |
| 1941 | 31 |
| 1942 | 33 |
| 1943 | 19 |
| 1944 | 37 |
| 1945 | 19 |
| 1946 | 15 |
| 1947 | 30 |
| 1948 | 5 |
| 1949 | 17 |
| 1950 | 43 |
| 1951 | 16 |
| 1952 | 20 |
| 1953 | 15 |
| 1954 | 14 |
| 1955 | 5 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1935-01-18 | Record low maximum temperature | Record low maximum temperature -6.7 C (19.9 F) |
| 1935-01-19 | Record low maximum temperature | Record low maximum temperature -7.8 C (18.0 F) |
Wettest Day of Each Month
Nov: 109.0 mm (4.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 82.3 mm (3.2 in) | 21 January 1935 |
| Feb | 99.1 mm (3.9 in) | 9 February 1951 |
| Mar | 66.8 mm (2.6 in) | 3 March 1950 |
| Apr | 64.8 mm (2.6 in) | 11 April 1899 |
| May | 33.8 mm (1.3 in) | 16 May 1941 |
| Jun | 30.5 mm (1.2 in) | 25 June 1931 |
| Jul | 30.5 mm (1.2 in) | 14 July 1939 |
| Aug | 26.9 mm (1.1 in) | 31 August 1936 |
| Sep | 51.3 mm (2.0 in) | 30 September 1953 |
| Oct | 55.6 mm (2.2 in) | 3 October 1927 |
| Nov | 109.0 mm (4.3 in) | 14 November 1906 |
| Dec | 81.8 mm (3.2 in) | 27 December 1937 |
Period of Record Coverage
1891 to 1955| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1891 | 92 | 25% | No |
| 1892 | 267 | 73% | No |
| 1898 | 362 | 99% | Yes |
| 1899 | 312 | 85% | No |
| 1900 | 365 | 100% | Yes |
| 1901 | 334 | 92% | Yes |
| 1902 | 348 | 95% | Yes |
| 1903 | 357 | 98% | Yes |
| 1904 | 337 | 92% | Yes |
| 1905 | 357 | 98% | Yes |
| 1906 | 361 | 99% | Yes |
| 1907 | 362 | 99% | Yes |
| 1908 | 365 | 100% | Yes |
| 1909 | 365 | 100% | Yes |
| 1910 | 362 | 99% | Yes |
| 1911 | 358 | 98% | Yes |
| 1912 | 365 | 100% | Yes |
| 1913 | 363 | 99% | Yes |
| 1915 | 240 | 66% | No |
| 1916 | 357 | 98% | Yes |
| 1917 | 359 | 98% | Yes |
| 1918 | 338 | 93% | Yes |
| 1919 | 354 | 97% | Yes |
| 1920 | 365 | 100% | Yes |
| 1921 | 355 | 97% | Yes |
| 1922 | 358 | 98% | Yes |
| 1923 | 355 | 97% | Yes |
| 1924 | 337 | 92% | Yes |
| 1925 | 138 | 38% | No |
| 1926 | 362 | 99% | Yes |
| 1927 | 361 | 99% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 211 | 58% | No |
| 1931 | 302 | 83% | No |
| 1932 | 265 | 72% | No |
| 1933 | 240 | 66% | No |
| 1934 | 265 | 73% | No |
| 1935 | 323 | 88% | No |
| 1936 | 286 | 78% | No |
| 1937 | 338 | 93% | Yes |
| 1938 | 355 | 97% | Yes |
| 1939 | 272 | 75% | No |
| 1940 | 346 | 95% | Yes |
| 1941 | 360 | 99% | Yes |
| 1942 | 351 | 96% | Yes |
| 1943 | 336 | 92% | Yes |
| 1944 | 341 | 93% | Yes |
| 1945 | 330 | 90% | Yes |
| 1946 | 338 | 93% | Yes |
| 1947 | 260 | 71% | No |
| 1948 | 210 | 57% | No |
| 1949 | 361 | 99% | Yes |
| 1950 | 362 | 99% | Yes |
| 1951 | 359 | 98% | Yes |
| 1952 | 364 | 99% | Yes |
| 1953 | 350 | 96% | Yes |
| 1954 | 354 | 97% | Yes |
| 1955 | 58 | 16% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 February 1955 | Vashon Island, US | daily low min | -2.8 C (27.0 F) | 0.6 C (1.1 F) | 44 years | 20 of 100 (Routine) |
| 27 February 1955 | Vashon Island, US | daily low max | 3.9 C (39.0 F) | 0.5 C (0.9 F) | 21 years | 13 of 100 (Routine) |
| 26 February 1955 | Vashon Island, US | daily low max | 3.9 C (39.0 F) | 1.7 C (3.1 F) | 41 years | 23 of 100 (Routine) |
| 20 February 1955 | Vashon Island, US | daily low min | -2.8 C (27.0 F) | 0.6 C (1.1 F) | 37 years | 18 of 100 (Routine) |
| 7 February 1955 | Vashon Island, US | daily high min | 8.3 C (46.9 F) | 1.1 C (2.0 F) | 28 years | 17 of 100 (Routine) |
| 25 November 1954 | Vashon Island, US | daily rain | 32.5 mm (1.3 in) | 5.8 mm (0.23 in) | 47 years | 25 of 100 (Routine) |
| 22 November 1954 | Vashon Island, US | daily high min | 11.7 C (53.1 F) | 0.6 C (1.1 F) | 20 years | 13 of 100 (Routine) |
| 19 November 1954 | Vashon Island, US | daily high min | 8.9 C (48.0 F) | 0.6 C (1.1 F) | 43 years | 19 of 100 (Routine) |
| 18 November 1954 | Vashon Island, US | daily high min (Tie) | 10.0 C (50.0 F) | tie | 45 years | 4 of 100 (Routine) |
| 10 November 1954 | Vashon Island, US | daily high min | 9.4 C (48.9 F) | 1.1 C (2.0 F) | 48 years | 23 of 100 (Routine) |
| 5 November 1954 | Vashon Island, US | daily high min | 10.6 C (51.1 F) | 1.2 C (2.2 F) | 48 years | 23 of 100 (Routine) |
| 14 October 1954 | Vashon Island, US | daily high max (Tie) | 21.1 C (70.0 F) | tie | 12 years | 2 of 100 (Routine) |
| 5 October 1954 | Vashon Island, US | daily low max (Tie) | 12.2 C (54.0 F) | tie | 7 years | 2 of 100 (Routine) |
| 23 September 1954 | Vashon Island, US | daily high min (Tie) | 13.3 C (55.9 F) | tie | 51 years | 5 of 100 (Routine) |
| 18 September 1954 | Vashon Island, US | daily rain | 22.9 mm (0.9 in) | 7.2 mm (0.28 in) | 32 years | 20 of 100 (Routine) |
| 17 September 1954 | Vashon Island, US | daily rain | 27.9 mm (1.1 in) | 10.1 mm (0.4 in) | 23 years | 23 of 100 (Routine) |
| 20 July 1954 | Vashon Island, US | daily rain | 7.6 mm (0.30 in) | 4.0 mm (0.16 in) | 15 years | 16 of 100 (Routine) |
| 10 July 1954 | Vashon Island, US | daily low max (Tie) | 16.7 C (62.1 F) | tie | 40 years | 4 of 100 (Routine) |
| 3 July 1954 | Vashon Island, US | daily low min (Tie) | 5.6 C (42.1 F) | tie | 35 years | 4 of 100 (Routine) |
| 2 July 1954 | Vashon Island, US | daily low min | 5.6 C (42.1 F) | 0.5 C (0.9 F) | 4 years | 9 of 100 (Routine) |
Climate Trend
37 complete years, 1898 to 1954| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1898 | 10.4 C | +0.10 C |
| 1900 | 10.7 C | +0.33 C |
| 1902 | 10.4 C | +0.06 C |
| 1903 | 10.1 C | -0.23 C |
| 1905 | 10.7 C | +0.39 C |
| 1906 | 11.0 C | +0.66 C |
| 1907 | 10.4 C | +0.04 C |
| 1908 | 10.2 C | -0.12 C |
| 1909 | 9.4 C | -0.94 C |
| 1910 | 9.8 C | -0.59 C |
| 1911 | 9.4 C | -0.93 C |
| 1912 | 10.0 C | -0.39 C |
| 1913 | 9.6 C | -0.70 C |
| 1916 | 9.5 C | -0.87 C |
| 1917 | 10.8 C | +0.43 C |
| 1919 | 9.7 C | -0.62 C |
| 1920 | 10.0 C | -0.32 C |
| 1921 | 10.0 C | -0.30 C |
| 1922 | 9.5 C | -0.87 C |
| 1923 | 11.0 C | +0.63 C |
| 1924 | 10.3 C | -0.02 C |
| 1926 | 11.9 C | +1.51 C |
| 1927 | 10.3 C | -0.04 C |
| 1928 | 10.7 C | +0.36 C |
| 1935 | 9.4 C | -0.90 C |
| 1937 | 10.0 C | -0.37 C |
| 1938 | 10.5 C | +0.17 C |
| 1941 | 11.7 C | +1.36 C |
| 1942 | 11.1 C | +0.78 C |
| 1944 | 11.1 C | +0.74 C |
| 1946 | 10.0 C | -0.34 C |
| 1949 | 10.4 C | +0.01 C |
| 1950 | 10.0 C | -0.33 C |
| 1951 | 10.5 C | +0.12 C |
| 1952 | 10.7 C | +0.40 C |
| 1953 | 11.1 C | +0.77 C |
| 1954 | 10.2 C | -0.16 C |
The fitted trend in annual mean temperature here over 1898 to 1954 is 0.08 C (-0.03 to 0.20) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.4) 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 | 0.08 C (-0.03 to 0.20) per decade | 0.2 F (-0.1 to 0.4) per decade | 1898 to 1954 | 37 | Not clearly different from zero |
| Mean daily maximum | 0.2 C (0.1 to 0.4) per decade | 0.4 F (0.1 to 0.6) per decade | 1898 to 1954 | 37 | Rise |
| Mean daily minimum | -0.04 C (-0.17 to 0.09) per decade | -0.1 F (-0.3 to 0.2) per decade | 1898 to 1954 | 37 | 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
1891 to 1955| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 36.7 C (98.1 F) | 1892 | 31.1 C (88.0 F) | 58 |
| Coldest night (TNn) | -13.9 C (7.0 F) | 1919 | -7.5 C (18.5 F) | 58 |
| Wettest day (Rx1day) | 109.0 mm (4.3 in) | 1906 | 49.8 mm (2.0 in) | 59 |
| Wettest five days (Rx5day) | 259.3 mm (10.2 in) | 1933 | 100.9 mm (4.0 in) | 59 |
| Longest dry spell (CDD) | 78 days | 1922 | 34 days | 59 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1891 | 32.8 C (91.0 F) |
| 1892 | 36.7 C (98.1 F) |
| 1898 | 32.2 C (90.0 F) |
| 1899 | 31.7 C (89.1 F) |
| 1900 | 27.8 C (82.0 F) |
| 1901 | 28.3 C (82.9 F) |
| 1902 | 30.6 C (87.1 F) |
| 1903 | 30.0 C (86.0 F) |
| 1904 | 32.2 C (90.0 F) |
| 1905 | 30.0 C (86.0 F) |
| 1906 | 30.0 C (86.0 F) |
| 1907 | 31.7 C (89.1 F) |
| 1908 | 29.4 C (84.9 F) |
| 1909 | 27.8 C (82.0 F) |
| 1910 | 28.9 C (84.0 F) |
| 1911 | 30.0 C (86.0 F) |
| 1912 | 27.8 C (82.0 F) |
| 1913 | 28.3 C (82.9 F) |
| 1914 | n/a |
| 1915 | 33.9 C (93.0 F) |
| 1916 | 33.3 C (91.9 F) |
| 1917 | 31.1 C (88.0 F) |
| 1918 | 31.7 C (89.1 F) |
| 1919 | 32.2 C (90.0 F) |
| 1920 | 33.9 C (93.0 F) |
| 1921 | 28.9 C (84.0 F) |
| 1922 | 32.2 C (90.0 F) |
| 1923 | 32.2 C (90.0 F) |
| 1924 | 34.4 C (93.9 F) |
| 1925 | 30.6 C (87.1 F) |
| 1926 | 32.8 C (91.0 F) |
| 1927 | 32.2 C (90.0 F) |
| 1928 | 32.2 C (90.0 F) |
| 1929 | 28.9 C (84.0 F) |
| 1931 | 35.0 C (95.0 F) |
| 1932 | 31.1 C (88.0 F) |
| 1933 | 31.7 C (89.1 F) |
| 1934 | 30.0 C (86.0 F) |
| 1935 | 31.1 C (88.0 F) |
| 1936 | 32.2 C (90.0 F) |
| 1937 | 31.1 C (88.0 F) |
| 1938 | 31.1 C (88.0 F) |
| 1939 | 33.3 C (91.9 F) |
| 1940 | 32.2 C (90.0 F) |
| 1941 | 35.0 C (95.0 F) |
| 1942 | 35.6 C (96.1 F) |
| 1943 | 31.1 C (88.0 F) |
| 1944 | 32.8 C (91.0 F) |
| 1945 | 31.1 C (88.0 F) |
| 1946 | 28.9 C (84.0 F) |
| 1947 | 27.8 C (82.0 F) |
| 1948 | 29.4 C (84.9 F) |
| 1949 | 32.2 C (90.0 F) |
| 1950 | 31.1 C (88.0 F) |
| 1951 | 34.4 C (93.9 F) |
| 1952 | 35.0 C (95.0 F) |
| 1953 | 31.1 C (88.0 F) |
| 1954 | 28.3 C (82.9 F) |
| 1955 | 11.7 C (53.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1891 | 3.9 C (39.0 F) |
| 1892 | -3.3 C (26.1 F) |
| 1898 | -3.3 C (26.1 F) |
| 1899 | -12.8 C (9.0 F) |
| 1900 | -7.8 C (18.0 F) |
| 1901 | -3.9 C (25.0 F) |
| 1902 | -10.0 C (14.0 F) |
| 1903 | -5.0 C (23.0 F) |
| 1904 | -3.9 C (25.0 F) |
| 1905 | -7.8 C (18.0 F) |
| 1906 | -6.1 C (21.0 F) |
| 1907 | -10.6 C (12.9 F) |
| 1908 | -3.9 C (25.0 F) |
| 1909 | -10.6 C (12.9 F) |
| 1910 | -5.0 C (23.0 F) |
| 1911 | -7.8 C (18.0 F) |
| 1912 | -4.4 C (24.1 F) |
| 1913 | -6.1 C (21.0 F) |
| 1914 | n/a |
| 1915 | -5.6 C (21.9 F) |
| 1916 | -11.1 C (12.0 F) |
| 1917 | -11.1 C (12.0 F) |
| 1918 | -7.2 C (19.0 F) |
| 1919 | -13.9 C (7.0 F) |
| 1920 | -6.7 C (19.9 F) |
| 1921 | -5.6 C (21.9 F) |
| 1922 | -9.4 C (15.1 F) |
| 1923 | -10.0 C (14.0 F) |
| 1924 | -12.8 C (9.0 F) |
| 1925 | -2.2 C (28.0 F) |
| 1926 | -8.9 C (16.0 F) |
| 1927 | -10.0 C (14.0 F) |
| 1928 | -7.2 C (19.0 F) |
| 1929 | -11.1 C (12.0 F) |
| 1931 | -3.9 C (25.0 F) |
| 1932 | -10.6 C (12.9 F) |
| 1933 | -11.7 C (10.9 F) |
| 1934 | -6.7 C (19.9 F) |
| 1935 | -11.7 C (10.9 F) |
| 1936 | -7.8 C (18.0 F) |
| 1937 | -10.6 C (12.9 F) |
| 1938 | -6.1 C (21.0 F) |
| 1939 | -4.4 C (24.1 F) |
| 1940 | -3.9 C (25.0 F) |
| 1941 | -10.6 C (12.9 F) |
| 1942 | -6.1 C (21.0 F) |
| 1943 | -13.3 C (8.1 F) |
| 1944 | -6.7 C (19.9 F) |
| 1945 | -3.3 C (26.1 F) |
| 1946 | -6.1 C (21.0 F) |
| 1947 | -7.8 C (18.0 F) |
| 1948 | -6.1 C (21.0 F) |
| 1949 | -8.9 C (16.0 F) |
| 1950 | -12.8 C (9.0 F) |
| 1951 | -8.3 C (17.1 F) |
| 1952 | -8.3 C (17.1 F) |
| 1953 | -2.2 C (28.0 F) |
| 1954 | -8.3 C (17.1 F) |
| 1955 | -3.3 C (26.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1891 | 3.0 mm (0.12 in) |
| 1892 | 5.1 mm (0.20 in) |
| 1898 | 33.5 mm (1.3 in) |
| 1899 | 64.8 mm (2.6 in) |
| 1900 | 55.6 mm (2.2 in) |
| 1901 | 49.8 mm (2.0 in) |
| 1902 | 58.2 mm (2.3 in) |
| 1903 | 42.2 mm (1.7 in) |
| 1904 | 71.1 mm (2.8 in) |
| 1905 | 46.5 mm (1.8 in) |
| 1906 | 109.0 mm (4.3 in) |
| 1907 | 47.2 mm (1.9 in) |
| 1908 | 44.7 mm (1.8 in) |
| 1909 | 51.1 mm (2.0 in) |
| 1910 | 60.7 mm (2.4 in) |
| 1911 | 46.5 mm (1.8 in) |
| 1912 | 35.8 mm (1.4 in) |
| 1913 | 31.5 mm (1.2 in) |
| 1914 | 51.8 mm (2.0 in) |
| 1915 | 45.7 mm (1.8 in) |
| 1916 | 53.6 mm (2.1 in) |
| 1917 | 50.8 mm (2.0 in) |
| 1918 | 43.4 mm (1.7 in) |
| 1919 | 66.0 mm (2.6 in) |
| 1920 | 48.0 mm (1.9 in) |
| 1921 | 66.3 mm (2.6 in) |
| 1922 | 47.5 mm (1.9 in) |
| 1923 | 43.2 mm (1.7 in) |
| 1924 | 50.8 mm (2.0 in) |
| 1925 | 25.4 mm (1.0 in) |
| 1926 | 48.8 mm (1.9 in) |
| 1927 | 55.6 mm (2.2 in) |
| 1928 | 41.9 mm (1.6 in) |
| 1929 | 28.7 mm (1.1 in) |
| 1931 | 50.8 mm (2.0 in) |
| 1932 | 62.2 mm (2.4 in) |
| 1933 | 79.2 mm (3.1 in) |
| 1934 | 54.4 mm (2.1 in) |
| 1935 | 82.3 mm (3.2 in) |
| 1936 | 80.8 mm (3.2 in) |
| 1937 | 81.8 mm (3.2 in) |
| 1938 | 43.9 mm (1.7 in) |
| 1939 | 47.5 mm (1.9 in) |
| 1940 | 39.4 mm (1.6 in) |
| 1941 | 50.8 mm (2.0 in) |
| 1942 | 54.9 mm (2.2 in) |
| 1943 | 48.8 mm (1.9 in) |
| 1944 | 30.7 mm (1.2 in) |
| 1945 | 56.4 mm (2.2 in) |
| 1946 | 50.8 mm (2.0 in) |
| 1947 | 53.6 mm (2.1 in) |
| 1948 | 37.1 mm (1.5 in) |
| 1949 | 43.2 mm (1.7 in) |
| 1950 | 66.8 mm (2.6 in) |
| 1951 | 99.1 mm (3.9 in) |
| 1952 | 19.6 mm (0.8 in) |
| 1953 | 51.3 mm (2.0 in) |
| 1954 | 40.6 mm (1.6 in) |
| 1955 | 40.6 mm (1.6 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1891 | 8.1 mm (0.32 in) |
| 1892 | 9.5 mm (0.37 in) |
| 1898 | 98.3 mm (3.9 in) |
| 1899 | 107.2 mm (4.2 in) |
| 1900 | 91.9 mm (3.6 in) |
| 1901 | 106.9 mm (4.2 in) |
| 1902 | 104.2 mm (4.1 in) |
| 1903 | 100.4 mm (4.0 in) |
| 1904 | 156.9 mm (6.2 in) |
| 1905 | 100.5 mm (4.0 in) |
| 1906 | 172.8 mm (6.8 in) |
| 1907 | 98.0 mm (3.9 in) |
| 1908 | 89.6 mm (3.5 in) |
| 1909 | 101.1 mm (4.0 in) |
| 1910 | 161.1 mm (6.3 in) |
| 1911 | 69.7 mm (2.7 in) |
| 1912 | 90.9 mm (3.6 in) |
| 1913 | 89.4 mm (3.5 in) |
| 1914 | 170.6 mm (6.7 in) |
| 1915 | 100.0 mm (3.9 in) |
| 1916 | 121.7 mm (4.8 in) |
| 1917 | 149.4 mm (5.9 in) |
| 1918 | 122.4 mm (4.8 in) |
| 1919 | 131.6 mm (5.2 in) |
| 1920 | 98.1 mm (3.9 in) |
| 1921 | 158.2 mm (6.2 in) |
| 1922 | 82.0 mm (3.2 in) |
| 1923 | 88.2 mm (3.5 in) |
| 1924 | 100.9 mm (4.0 in) |
| 1925 | 83.8 mm (3.3 in) |
| 1926 | 76.7 mm (3.0 in) |
| 1927 | 82.0 mm (3.2 in) |
| 1928 | 88.0 mm (3.5 in) |
| 1929 | 73.6 mm (2.9 in) |
| 1931 | 120.0 mm (4.7 in) |
| 1932 | 145.0 mm (5.7 in) |
| 1933 | 259.3 mm (10.2 in) |
| 1934 | 151.0 mm (5.9 in) |
| 1935 | 218.2 mm (8.6 in) |
| 1936 | 132.8 mm (5.2 in) |
| 1937 | 203.9 mm (8.0 in) |
| 1938 | 81.0 mm (3.2 in) |
| 1939 | 150.6 mm (5.9 in) |
| 1940 | 75.2 mm (3.0 in) |
| 1941 | 141.3 mm (5.6 in) |
| 1942 | 101.8 mm (4.0 in) |
| 1943 | 132.1 mm (5.2 in) |
| 1944 | 77.7 mm (3.1 in) |
| 1945 | 105.5 mm (4.2 in) |
| 1946 | 89.2 mm (3.5 in) |
| 1947 | 141.6 mm (5.6 in) |
| 1948 | 79.8 mm (3.1 in) |
| 1949 | 86.2 mm (3.4 in) |
| 1950 | 98.5 mm (3.9 in) |
| 1951 | 175.0 mm (6.9 in) |
| 1952 | 54.9 mm (2.2 in) |
| 1953 | 127.6 mm (5.0 in) |
| 1954 | 109.4 mm (4.3 in) |
| 1955 | 73.1 mm (2.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1891 | 35 days |
| 1892 | 36 days |
| 1898 | 30 days |
| 1899 | 22 days |
| 1900 | 21 days |
| 1901 | 25 days |
| 1902 | 30 days |
| 1903 | 36 days |
| 1904 | 40 days |
| 1905 | 31 days |
| 1906 | 44 days |
| 1907 | 27 days |
| 1908 | 18 days |
| 1909 | 44 days |
| 1910 | 46 days |
| 1911 | 46 days |
| 1912 | 21 days |
| 1913 | 38 days |
| 1914 | 74 days |
| 1915 | 45 days |
| 1916 | 46 days |
| 1917 | 70 days |
| 1918 | 41 days |
| 1919 | 34 days |
| 1920 | 45 days |
| 1921 | 43 days |
| 1922 | 78 days |
| 1923 | 43 days |
| 1924 | 29 days |
| 1925 | 24 days |
| 1926 | 63 days |
| 1927 | 46 days |
| 1928 | 60 days |
| 1929 | 31 days |
| 1931 | 46 days |
| 1932 | 20 days |
| 1933 | 30 days |
| 1934 | 28 days |
| 1935 | 22 days |
| 1936 | 44 days |
| 1937 | 24 days |
| 1938 | 2 days |
| 1939 | 24 days |
| 1940 | 34 days |
| 1941 | 25 days |
| 1942 | 40 days |
| 1943 | 27 days |
| 1944 | 50 days |
| 1945 | 37 days |
| 1946 | 43 days |
| 1947 | 22 days |
| 1948 | 14 days |
| 1949 | 20 days |
| 1950 | 30 days |
| 1951 | 51 days |
| 1952 | 40 days |
| 1953 | 15 days |
| 1954 | 24 days |
| 1955 | 7 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 Vashon Island falls on 7 April and the median first autumn frost on 13 November, which leaves a median of 213 days between them.
Fitted over all years, the growing season changes by -2.7 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1908 to 1954) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 7 April | n/a | 8 April | n/a | +1.4 days per decade |
| First autumn frost | 13 November | n/a | 13 November | n/a | -1.3 days per decade |
| Growing days | 213 days | n/a | 211 days | n/a | -2.7 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
42 years, 1898 to 1954A day with at least 49.3 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 104.2 mm (4.1 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 49.3 mm (1.9 in) | |
| 5 years | 62.6 mm (2.5 in) | |
| 10 years | 72.0 mm (2.8 in) | |
| 25 years | 84.5 mm (3.3 in) | |
| 50 years | 94.2 mm (3.7 in) | Longer than the 42 years of record |
| 100 years | 104.2 mm (4.1 in) | Longer than the 42 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, 42 years of values from 1898 to 1954.
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: 109.0 mm (4.3 in) in 1906; 99.1 mm (3.9 in) in 1951; 80.8 mm (3.2 in) in 1936.
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).