Historical exposure to drought — Land soil moisture anomaly in Seattle-Tacoma-Olympia, WA
Seattle-Tacoma-Olympia, WA: Historical exposure to drought — Land soil moisture anomaly was -3.16 Percentage change in 2025. ◆ Volatile
Historical exposure to drought — Land soil moisture anomaly in Seattle-Tacoma-Olympia, WA, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Percentage change.
Analysis
In 2025, historical exposure to drought — land soil moisture anomaly in Seattle-Tacoma-Olympia, WA stood at -3.16 Percentage change.
That represents a change of down 173.5% on the previous year and up 15.6% over ten years.
Over the whole period, historical exposure to drought — land soil moisture anomaly in Seattle-Tacoma-Olympia, WA peaked at 11.74 Percentage change in 1964 and was at its lowest, -6.21 Percentage change, in 1987.
That places Seattle-Tacoma-Olympia, WA 1800th out of 3112 regions with data for 2025, putting it in the middle of the range.
The series is highly variable year to year, so single readings are best treated with caution.
Historical exposure to drought — Land soil moisture anomaly in Seattle-Tacoma-Olympia, WA, year by year
| Year | Percentage change | Change |
|---|---|---|
| 1950 | 0.5655 Percentage change | — |
| 1951 | -2.38 Percentage change | -521.0% |
| 1952 | -4.09 Percentage change | +71.8% |
| 1953 | 7.82 Percentage change | -291.2% |
| 1954 | 3.46 Percentage change | -55.8% |
| 1955 | 7.68 Percentage change | +122.1% |
| 1956 | -1.77 Percentage change | -123.1% |
| 1957 | -0.5169 Percentage change | -70.8% |
| 1958 | 2.29 Percentage change | -543.9% |
| 1959 | 5.21 Percentage change | +127.0% |
| 1960 | 1.35 Percentage change | -74.1% |
| 1961 | 3.38 Percentage change | +150.3% |
| 1962 | 1.62 Percentage change | -52.0% |
| 1963 | 3.48 Percentage change | +114.6% |
| 1964 | 11.74 Percentage change | +237.2% |
| 1965 | -3.78 Percentage change | -132.2% |
| 1966 | 1.03 Percentage change | -127.2% |
| 1967 | -0.8718 Percentage change | -184.7% |
| 1968 | 4.03 Percentage change | -562.1% |
| 1969 | 2.97 Percentage change | -26.3% |
| 1970 | -3.86 Percentage change | -230.0% |
| 1971 | 4.7 Percentage change | -221.7% |
| 1972 | -1.61 Percentage change | -134.2% |
| 1973 | 1.33 Percentage change | -182.6% |
| 1974 | -1.8 Percentage change | -235.1% |
| 1975 | 2.3 Percentage change | -228.3% |
| 1976 | 2.3 Percentage change | -0.2% |
| 1977 | 5.07 Percentage change | +120.7% |
| 1978 | 3.72 Percentage change | -26.6% |
| 1979 | -4.58 Percentage change | -222.9% |
| 1980 | 3.23 Percentage change | -170.6% |
| 1981 | 5.46 Percentage change | +68.9% |
| 1982 | 1.49 Percentage change | -72.7% |
| 1983 | 4.64 Percentage change | +211.3% |
| 1984 | 1.43 Percentage change | -69.3% |
| 1985 | -3.6 Percentage change | -352.4% |
| 1986 | -0.7589 Percentage change | -78.9% |
| 1987 | -6.21 Percentage change | +718.9% |
| 1988 | -2.36 Percentage change | -62.0% |
| 1989 | 1.63 Percentage change | -169.0% |
| 1990 | 1.99 Percentage change | +22.0% |
| 1991 | -0.2778 Percentage change | -114.0% |
| 1992 | -2.47 Percentage change | +788.2% |
| 1993 | -0.5344 Percentage change | -78.3% |
| 1994 | -1.79 Percentage change | +235.1% |
| 1995 | -0.4095 Percentage change | -77.1% |
| 1996 | -0.8638 Percentage change | +110.9% |
| 1997 | 11.44 Percentage change | -1424.0% |
| 1998 | -5.58 Percentage change | -148.8% |
| 1999 | 3.49 Percentage change | -162.6% |
| 2000 | 2.05 Percentage change | -41.4% |
| 2001 | 3.62 Percentage change | +76.9% |
| 2002 | -5.99 Percentage change | -265.5% |
| 2003 | -6.13 Percentage change | +2.4% |
| 2004 | -1.6 Percentage change | -73.8% |
| 2005 | 2.29 Percentage change | -242.7% |
| 2006 | -4.01 Percentage change | -275.2% |
| 2007 | 0.6064 Percentage change | -115.1% |
| 2008 | 1.37 Percentage change | +126.1% |
| 2009 | -4.61 Percentage change | -436.1% |
| 2010 | 5.71 Percentage change | -223.9% |
| 2011 | 3.67 Percentage change | -35.8% |
| 2012 | 1.74 Percentage change | -52.7% |
| 2013 | 3.64 Percentage change | +109.8% |
| 2014 | 2.47 Percentage change | -32.3% |
| 2015 | -3.75 Percentage change | -251.9% |
| 2016 | -2.45 Percentage change | -34.7% |
| 2017 | -5.36 Percentage change | +119.0% |
| 2018 | -3.25 Percentage change | -39.3% |
| 2019 | -3.82 Percentage change | +17.4% |
| 2020 | 2.28 Percentage change | -159.6% |
| 2021 | -1.82 Percentage change | -180.0% |
| 2022 | -3.45 Percentage change | +89.4% |
| 2023 | -5.15 Percentage change | +49.2% |
| 2024 | 4.3 Percentage change | -183.6% |
| 2025 | -3.16 Percentage change | -173.5% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 1.83 Percentage change | -4.09 Percentage change | 7.82 Percentage change | 10 |
| 1960s | 2.5 Percentage change | -3.78 Percentage change | 11.74 Percentage change | 10 |
| 1970s | 0.7582 Percentage change | -4.58 Percentage change | 5.07 Percentage change | 10 |
| 1980s | 0.4941 Percentage change | -6.21 Percentage change | 5.46 Percentage change | 10 |
| 1990s | 0.4993 Percentage change | -5.58 Percentage change | 11.44 Percentage change | 10 |
| 2000s | -1.24 Percentage change | -6.13 Percentage change | 3.62 Percentage change | 10 |
| 2010s | -0.1412 Percentage change | -5.36 Percentage change | 5.71 Percentage change | 10 |
| 2020s | -1.17 Percentage change | -5.15 Percentage change | 4.3 Percentage change | 6 |
More environment data for Seattle-Tacoma-Olympia, WA
- Historical exposure to drought — Cropland soil moisture anomaly -4.3 Percentage change (2025)
- River flooding exposure — Cropland share exposed to river flooding 7.8 Percentage of agricultural land area (2022)
Frequently asked questions
- What is historical exposure to drought — land soil moisture anomaly in Seattle-Tacoma-Olympia, WA?
- Historical exposure to drought — land soil moisture anomaly in Seattle-Tacoma-Olympia, WA was -3.16 Percentage change in 2025, according to Organisation for Economic Co-operation and Development.
- What is the highest historical exposure to drought — land soil moisture anomaly recorded in Seattle-Tacoma-Olympia, WA?
- The highest recorded value was 11.74 Percentage change in 1964.
- What is the lowest historical exposure to drought — land soil moisture anomaly recorded in Seattle-Tacoma-Olympia, WA?
- The lowest recorded value was -6.21 Percentage change in 1987.
- How does Seattle-Tacoma-Olympia, WA rank for historical exposure to drought — land soil moisture anomaly?
- Seattle-Tacoma-Olympia, WA ranks 1800th out of 3112 regions with data for 2025.
- Is historical exposure to drought — land soil moisture anomaly rising or falling in Seattle-Tacoma-Olympia, WA?
- Over the last ten years it is up 15.6%. The long-run trend across the full record is volatile.
- Where does this Seattle-Tacoma-Olympia, WA data come from?
- The figures come from Organisation for Economic Co-operation and Development, published as part of Historical exposure to drought — Land soil moisture anomaly. Statizoid updates them automatically from the source API.
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About this data
The dataset provides annual anomalies in land and cropland soil moisture content of the top soil layer (0 to 7 cm) compared to the reference period 1981-2010. Exposure indicators to drought have been prepared by the Organisation for Economic Co-operation and Development (OECD). Please see the working paper for a more complete description of the methods. The datasets span the period 1981-2024 and is the result of the use of a variety of geospatial data sources, including the ERA5-Land averaged monthly data of volumetric soil moisture and ESA CCI land cover data. Average anomalies have been calculated for both land and cropland exposure to drought. The dataset has a global coverage on a national level; on the sub-national TL2 level (i.e. large subnational regions) results are reported for all OECD countries as well as for Argentina, Brazil, China, India, Indonesia and South Africa. A number of aggregates are included: Euro area, European Union, Advanced economies, Emerging market economies, G7, G20, OECD, OECD Europe, OECD Asia Oceania, OECD Americas and the LAC region. Data source(s): Copernicus Climate Change Initiative land cover data and Copernicus Climate Data Store monthly soil moisture data based on the ERA5-Land reanalysis dataset. Contact: ENV.Stat@oecd.org