# Annual precipitation in St. Clair County

Annual precipitation in St. Clair County was 35.83 inches in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `precipitation_annual`
- Place id: `us-county-17163`
- 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/st-clair-county-illinois
- API: https://invokely.ai/api/v1/series?indicator=precipitation_annual&place=us-county-17163

| Period | inches |
|---|---:|
| 2025 | 35.83 |
| 2024 | 48.07 |
| 2023 | 32.11 |
| 2022 | 40.39 |
| 2021 | 37.64 |
| 2020 | 48.16 |
| 2019 | 47.73 |
| 2018 | 52.43 |
| 2017 | 34.09 |
| 2016 | 39.84 |
| 2015 | 54.35 |
| 2014 | 39.37 |
| 2013 | 47.64 |
| 2012 | 34.36 |
| 2011 | 49.25 |
| 2010 | 39.51 |
| 2009 | 53.08 |
| 2008 | 53.32 |
| 2007 | 31.58 |
| 2006 | 35.55 |
| 2005 | 39.98 |
| 2004 | 45.21 |
| 2003 | 42.69 |
| 2002 | 38.8 |
| 2001 | 36.14 |
| 2000 | 44.5 |
| 1999 | 35.91 |
| 1998 | 45.34 |
| 1997 | 37.3 |
| 1996 | 43.47 |
| 1995 | 43.64 |
| 1994 | 39.48 |
| 1993 | 53.22 |
| 1992 | 32.75 |
| 1991 | 36.73 |
| 1990 | 51.36 |
| 1989 | 34.44 |
| 1988 | 35.02 |
| 1987 | 40.72 |
| 1986 | 38.68 |
| 1985 | 46.49 |
| 1984 | 48.09 |
| 1983 | 44.78 |
| 1982 | 48.69 |
| 1981 | 43.55 |
| 1980 | 28.6 |
| 1979 | 38.18 |
| 1978 | 35.33 |
| 1977 | 43.11 |
| 1976 | 24.58 |
| 1975 | 41.04 |
| 1974 | 37.42 |
| 1973 | 46.61 |
| 1972 | 40.35 |
| 1971 | 30.85 |
| 1970 | 34.4 |
| 1969 | 41.62 |
| 1968 | 40.1 |
| 1967 | 40.44 |
| 1966 | 33.45 |
| 1965 | 36.3 |
| 1964 | 30.96 |
| 1963 | 28.78 |
| 1962 | 38.07 |
| 1961 | 44.13 |
| 1960 | 31.13 |
| 1959 | 36.47 |
| 1958 | 42.78 |
| 1957 | 54.34 |
| 1956 | 37.69 |
| 1955 | 31.94 |
| 1954 | 33 |
| 1953 | 22.89 |
| 1952 | 32 |
| 1951 | 44.58 |
| 1950 | 45.07 |