# Annual precipitation in Washington County

Annual precipitation in Washington County was 31.36 inches in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `precipitation_annual`
- Place id: `us-county-19183`
- Unit: inches
- Definition: Total precipitation from January to December, in inches: rain plus the water content of snow and other frozen precipitation. NOAA computes it from its climate divisional dataset (nClimDiv): station readings interpolated onto a 5 km grid and averaged over the area.
- Note: Values are area averages, not the reading at one weather station. NOAA revises the last two years every month.
- Source: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December precipitation, counties (https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping)
- Publisher page: https://invokely.ai/en/publishers/noaa-ncei
- Retrieved: 2026-10-12
- License: Public domain (US government work); NCEI asks users to cite the nClimDiv dataset
- Citation: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December precipitation, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/annual-precipitation/washington-county-iowa
- API: https://invokely.ai/api/v1/series?indicator=precipitation_annual&place=us-county-19183

| Period | inches |
|---|---:|
| 2025 | 31.36 |
| 2024 | 37.55 |
| 2023 | 25.08 |
| 2022 | 25.33 |
| 2021 | 34.58 |
| 2020 | 36.75 |
| 2019 | 41.05 |
| 2018 | 45.36 |
| 2017 | 30.98 |
| 2016 | 32.26 |
| 2015 | 43.36 |
| 2014 | 42.78 |
| 2013 | 37.32 |
| 2012 | 30.88 |
| 2011 | 34.4 |
| 2010 | 55.06 |
| 2009 | 51.32 |
| 2008 | 47.14 |
| 2007 | 47.02 |
| 2006 | 35.12 |
| 2005 | 24.82 |
| 2004 | 36.2 |
| 2003 | 30.27 |
| 2002 | 31.75 |
| 2001 | 40.28 |
| 2000 | 32.94 |
| 1999 | 31.29 |
| 1998 | 47.12 |
| 1997 | 34.76 |
| 1996 | 31.53 |
| 1995 | 35.5 |
| 1994 | 28.82 |
| 1993 | 53.52 |
| 1992 | 41.23 |
| 1991 | 30.23 |
| 1990 | 43.54 |
| 1989 | 28.11 |
| 1988 | 18.84 |
| 1987 | 28.48 |
| 1986 | 41.98 |
| 1985 | 34.88 |
| 1984 | 36.46 |
| 1983 | 33.38 |
| 1982 | 43.09 |
| 1981 | 35.28 |
| 1980 | 33 |
| 1979 | 31.77 |
| 1978 | 37.98 |
| 1977 | 37.06 |
| 1976 | 27.91 |
| 1975 | 27 |
| 1974 | 40.69 |
| 1973 | 48.15 |
| 1972 | 36.57 |
| 1971 | 32.29 |
| 1970 | 43.01 |
| 1969 | 37.47 |
| 1968 | 29.15 |
| 1967 | 36.88 |
| 1966 | 30.74 |
| 1965 | 51.17 |
| 1964 | 26.56 |
| 1963 | 27.87 |
| 1962 | 31.47 |
| 1961 | 38.78 |
| 1960 | 39.04 |
| 1959 | 43.06 |
| 1958 | 31.97 |
| 1957 | 32.72 |
| 1956 | 19.85 |
| 1955 | 25.77 |
| 1954 | 33.5 |
| 1953 | 22.33 |
| 1952 | 31.08 |
| 1951 | 44.52 |
| 1950 | 27.67 |