Visitation · National Historical Park

Lewis and Clark National Historical Park visitation by month and year

July is the busiest month at Lewis and Clark, when the average temperature nearby is 61 degrees. December is the quietest, and the average temperature then is 43 degrees. July runs about 4.3 times the visits of December. The crowd arrives with the warm weather and leaves with it. Annual visits fell 9.9 percent, from 270,993 in 2019 to 244,195 in 2025.

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Visits by month, with temperature and precipitation

Bars are the average recreation visits in each month over 2021 to 2025. The line is the average temperature at Astoria Rgnl AP, 5 miles from the park's reference point at 9 feet, station USW00094224 in the NOAA 1991 to 2020 climate normals. The lower panel is monthly rain from the same station, which publishes no snowfall normal.

Annual visits, 1979 to 2025

Recreation visits per calendar year. A year with a missing month is left blank rather than estimated.

The last ten years

Year	Recreation visits	Change on prior year
2025	244,195	-8.6%
2024	267,118	-6.2%
2023	284,739	+1.7%
2022	279,924	+2.1%
2021	274,230	+70.1%
2020	161,230	-40.5%
2019	270,993	-5.4%
2018	286,349	-2.4%
2017	293,356	+4.2%
2016	281,576	+4.1%

Visitation at other parks

Olympic National Park Mount Rainier National Park Chesapeake & Ohio Canal National Historical Park San Francisco Maritime National Historical Park

Source: NPS Visitor Use Statistics, monthly recreation visits, as compiled for Publicopia Labs. A year is shown only when all twelve months were reported. Temperature, precipitation and snowfall normals are the 1991 to 2020 monthly averages published by NOAA NCEI for station USW00094224, 9 feet above sea level. Data refreshed October 14, 2026.