Oregon tide tables 20201/27/2024 My estimates were out by varying amounts during the month but not by more than an hour. I then panicked and paid £10 to get the Admiralty tides for 2020. Obviously the same dates will have different tides, but a full moon date within that period in 2018 should have similar tides to the closest full moon date in 2020. To be a little more accurate I compared August 2018 (when we were there) with August 2020. First I checked the phases of the moon (which are freely available for 2020 - indeed I think you can get them for 3020) and assumed the tide times and ranges are approximately the same each lunar month at the same phase of the moon. I was faced with the same issue searching for tide times and ranges for Lundy in 2020 (perhaps that's your question too). Thus if you find lunar tables for 2020, you can make a reasonable guess at the tide times by relating them to current tidal predictions (or even your own observations for a particular location that is along way from a standard or secondary port). Spring tides in the UK occur approximately 2 days after new/ full moons as this is the time it takes for the tidal wave to travel from the southern ocean to the N Atlantic. If you are only interested in approximate times, then it is useful to know that in any given location, spring tides always occur at approximately the same time of day, and these are in turn related to the phase of the moon. When you add in the fact that climbing locations may be a significant distance from ports where predictions are made, you could be out by quite a bit. Comparing the prediction on the CC website to the UKHO predictions, for example, shows that they are anywhere between 1/2 an hour to 45 mins out. Free predictions are much more approximate. In the UK only the UKHO do this, and they own the data (and charge for it). In order to make accurate tidal height/ time predictions, you have to run a harmonic analysis using data from tidal observations.
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