The first part (winter) of a seasonal study of the Hudson river in New York.
1922
1895
1957
1896
1927
1972
1991
1964
2015
1974
2020
2024
1950
2012
1940
1998
1969
2025
1933
2008
2010
2019
1997
1985
1999
2023
2014
1968
2000
1994
2016