Data / Annual precipitation / St. Clair County

Annual precipitation in St. Clair County

Annual precipitation in St. Clair County was 35.83 inches in 2025, according to NOAA National Centers for Environmental Information. That is down 25.5% from 2024. That is the 34th highest of 102 counties in 2025.

2025, inches35.83
Change on 2024-25.5%
Rank34th of 102Counties in Illinois ranked
Series high54.352015
Series low22.891953

Next release: Wednesday, 6 October 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Annual precipitation in St. Clair County, 1950 to 2025

2030405060195019611972198319942005201620251950: 45.07 inches1951: 44.58 inches1952: 32 inches1953: 22.89 inches1954: 33 inches1955: 31.94 inches1956: 37.69 inches1957: 54.34 inches1958: 42.78 inches1959: 36.47 inches1960: 31.13 inches1961: 44.13 inches1962: 38.07 inches1963: 28.78 inches1964: 30.96 inches1965: 36.3 inches1966: 33.45 inches1967: 40.44 inches1968: 40.1 inches1969: 41.62 inches1970: 34.4 inches1971: 30.85 inches1972: 40.35 inches1973: 46.61 inches1974: 37.42 inches1975: 41.04 inches1976: 24.58 inches1977: 43.11 inches1978: 35.33 inches1979: 38.18 inches1980: 28.6 inches1981: 43.55 inches1982: 48.69 inches1983: 44.78 inches1984: 48.09 inches1985: 46.49 inches1986: 38.68 inches1987: 40.72 inches1988: 35.02 inches1989: 34.44 inches1990: 51.36 inches1991: 36.73 inches1992: 32.75 inches1993: 53.22 inches1994: 39.48 inches1995: 43.64 inches1996: 43.47 inches1997: 37.3 inches1998: 45.34 inches1999: 35.91 inches2000: 44.5 inches2001: 36.14 inches2002: 38.8 inches2003: 42.69 inches2004: 45.21 inches2005: 39.98 inches2006: 35.55 inches2007: 31.58 inches2008: 53.32 inches2009: 53.08 inches2010: 39.51 inches2011: 49.25 inches2012: 34.36 inches2013: 47.64 inches2014: 39.37 inches2015: 54.35 inches2016: 39.84 inches2017: 34.09 inches2018: 52.43 inches2019: 47.73 inches2020: 48.16 inches2021: 37.64 inches2022: 40.39 inches2023: 32.11 inches2024: 48.07 inches2025: 35.83 inches
inches. Source: NOAA NCEI, NOAA Climate at a Glance, January to December precipitation, counties. Retrieved 2026-10-12, published 2026-10-06.
All 76 values
Periodinches
202535.83
202448.07
202332.11
202240.39
202137.64
202048.16
201947.73
201852.43
201734.09
201639.84
201554.35
201439.37
201347.64
201234.36
201149.25
201039.51
200953.08
200853.32
200731.58
200635.55
200539.98
200445.21
200342.69
200238.8
200136.14
200044.5
199935.91
199845.34
199737.3
199643.47
199543.64
199439.48
199353.22
199232.75
199136.73
199051.36
198934.44
198835.02
198740.72
198638.68
198546.49
198448.09
198344.78
198248.69
198143.55
198028.6
197938.18
197835.33
197743.11
197624.58
197541.04
197437.42
197346.61
197240.35
197130.85
197034.4
196941.62
196840.1
196740.44
196633.45
196536.3
196430.96
196328.78
196238.07
196144.13
196031.13
195936.47
195842.78
195754.34
195637.69
195531.94
195433
195322.89
195232
195144.58
195045.07

Compared with Illinois and United States

Place2025
St. Clair County35.83
Illinois32.96
United States29.26

Rankings

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.

Values are area averages, not the reading at one weather station. NOAA revises the last two years every month.

How to cite

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.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

NOAA National Centers for Environmental Information. (2026). NOAA Climate at a Glance, January to December precipitation, counties (Annual precipitation, St. Clair County, 1950 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping

MLA 9

NOAA Climate at a Glance, January to December precipitation, counties, Annual precipitation, St. Clair County, 1950 to 2025. NOAA National Centers for Environmental Information, 6 Oct. 2026, https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Invokely, https://invokely.ai/en/annual-precipitation/st-clair-county-illinois. Accessed 12 Oct. 2026.

Chicago (author-date)

NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December precipitation, counties. Annual precipitation, St. Clair County, 1950 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Also distributed by Invokely, https://invokely.ai/en/annual-precipitation/st-clair-county-illinois.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December precipitation, counties, Annual precipitation, St. Clair County, 1950 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping, via Invokely: https://invokely.ai/en/annual-precipitation/st-clair-county-illinois (Accessed: 12 October 2026).

BibTeX
@misc{noaa_annual_precipitation_st_clair_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December precipitation, counties: Annual precipitation, St. Clair County, 1950 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/annual-precipitation/st-clair-county-illinois. Publisher attribution: 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.},
}
RIS
TY  - DATA
AU  - NOAA National Centers for Environmental Information
TI  - NOAA Climate at a Glance, January to December precipitation, counties: Annual precipitation, St. Clair County, 1950 to 2025
PY  - 2026
DA  - 2026/10/06
PB  - NOAA National Centers for Environmental Information
DB  - Invokely
UR  - https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping
L2  - https://invokely.ai/en/annual-precipitation/st-clair-county-illinois
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/annual-precipitation/st-clair-county-illinois.
N1  - Publisher attribution: 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.
ER  -
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Questions

What is the annual precipitation in St. Clair County?

Annual precipitation in St. Clair County was 35.83 inches in 2025, according to NOAA National Centers for Environmental Information. That is down 25.5% from 2024. That is the 34th highest of 102 counties in 2025.

Where does this figure come from?

NOAA National Centers for Environmental Information. NOAA Climate at a Glance, January to December precipitation, counties. Retrieved by Invokely on 2026-10-12.

What was the highest annual precipitation in St. Clair County?

54.35 inches in 2015, the highest value since 1950 in this series.

Related statistics for St. Clair County

All statistics for St. Clair County | St. Clair County in figures