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Oceanographic Institution: water level history
Record1933–202588 years
Sea level trend3.15 mm/yrNo. 34 of 88
Great diurnal range0.67 mNo. 88
Highest water level3.29 m1938-09-21
Annual mean water level vs. period average (cm)
Bars are relative to the lowest year on record.
Top 10 monthly highest water levels
| Month | Highest (m above MSL) |
|---|---|
| September 1938 | 2.988 |
| August 1954 | 2.805 |
| September 1944 | 1.861 |
| August 1991 | 1.790 |
| September 1960 | 1.464 |
| October 2012 | 1.416 |
| December 2022 | 1.352 |
| February 1972 | 1.342 |
| December 2023 | 1.335 |
| January 2024 | 1.328 |
- 2025
- 2024
- 2023
- 2022
- 2021
- 2020
- 2019
- 2018
- 2017
- 2016
- 2015
- 2014
- 2013
- 2012
- 2011
- 2010
- 2009
- 2007
- 2006
- 2005
- 2004
- 2003
- 2002
- 2001
- 2000
- 1999
- 1998
- 1997
- 1996
- 1995
- 1994
- 1993
- 1992
- 1991
- 1990
Times and heights are NOAA astronomical predictions and do not include weather effects. Times are station local time (incl. daylight saving), heights in metres above MLLW. Not for navigation.
About this page
Monthly mean water levels at Oceanographic Institution since 1933. Long-term sea level trend: 3.15 mm per year.