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Monthly sea level peak for June 2021

The lunar month’s highest tide occurred on 1st June for Waitemata harbour and 27th June for Great Barrier Island.


The Waitemata harbour tidal gauge measured a mean level of 1.52 metres between 12:00am and 12:15am on 1st June which is 12cm below the June average (2015-2020). The barometric air pressure at the time of the reading was 997.5 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.36 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.


The ongoing trend between 2014 to 2021 for the Waitemata harbour sea level peak is downward. The tidal gauge data used for this analysis can be found here.



The Great Barrier Island tidal gauge measured a mean level of 1.07 metres between 9:15pm and 9:30pm on 27th June which is 11cm below the June average (2015-2020). The air pressure at the time of the reading was 1016.9 hPa, so when using the inverted barometric adjustment calculation method of 1cm for every 1 hPa, the projected height would have been 1.11 metres at the mean sea level pressure of 1013 hPa. More on meteorological effects on tides can be found here.



The ongoing trend between 2014 to 2021 for Great Barrier Island sea level peak is a flat. The tidal gauge data used for this analysis can be found here.



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