US counties by annual precipitation
Petersburg Borough had the highest annual precipitation of 3134 counties in 2015, at 223.43 inches. Imperial County had the lowest, at 2.21 inches. The median was 45.94 inches and the figure for the United States was 34.58 inches. Source: NOAA National Centers for Environmental Information.
Map of counties, 2015
Top 40 counties, 2015
Full ranking
Other periods
About this ranking
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.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.
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
APA 7
NOAA National Centers for Environmental Information. (2026). NOAA Climate at a Glance, January to December precipitation, counties (US counties by annual precipitation, 2015) [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, US counties by annual precipitation, 2015. 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/rankings/annual-precipitation/us-counties?period=2015. Accessed 12 Oct. 2026.
Chicago (author-date)
NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December precipitation, counties. US counties by annual precipitation, 2015. 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/rankings/annual-precipitation/us-counties?period=2015.
Harvard
NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December precipitation, counties, US counties by annual precipitation, 2015 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping, via Invokely: https://invokely.ai/rankings/annual-precipitation/us-counties?period=2015 (Accessed: 12 October 2026).
BibTeX
@misc{noaa_us_counties_by_annual_2015,
author = {{NOAA National Centers for Environmental Information}},
title = {{NOAA Climate at a Glance, January to December precipitation, counties: US counties by annual precipitation, 2015}},
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/rankings/annual-precipitation/us-counties?period=2015. 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: US counties by annual precipitation, 2015
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/rankings/annual-precipitation/us-counties?period=2015
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/annual-precipitation/us-counties?period=2015.
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 -
Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
Rank US counties by annual precipitation using official data, and cite the source.
rank_places {"indicator":"precipitation_annual","level":"province","within":"United States","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=precipitation_annual&level=province&within=United%20States&limit=10Questions
Which county has the highest annual precipitation?
Petersburg Borough, with 223.43 inches in 2015, according to NOAA National Centers for Environmental Information.
Which county has the lowest annual precipitation?
Imperial County, with 2.21 inches in 2015.
Where does this ranking come from?
Every value comes from one source and one period, so the places are comparable: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December precipitation, counties. Retrieved 2026-10-12.
Annual precipitation: other rankings
US counties: more rankings
- Share of days unhealthy for sensitive groups or worse (US EPA AQI)
- National Risk Index score (FEMA)
- Median Air Quality Index (US EPA)
- Social vulnerability score (FEMA National Risk Index)
- Gross domestic product (GDP), US dollars
- Real GDP growth
- GDP per capita, US dollars
- Net domestic migration, July to June