Can coconut trees survive in Kastellorizo island, Greece?

OK, Let's try to settle some things that were discussed last night in the shoutbox...

I don’t know why that station has an average so high compared to nearby places, located at similar altitude and exposed to more or less the same weather patterns, so being skeptical about the data is a healthy approach to begin with. Whether the data turns out to be reliable, outlandish or useless, should be tested. I don’t have any tools at hand other than data from several stations, experience in civil works, and basic knowledge of atmosphere physics, but I think it’s good enough to give an educated guess.
(1)
You are the first to compare data from wildly different periods of record, so don’t complain if it’s used against you. If anything, it shows you aren’t honest. You just want to push a narrative of how warm/mild the place is; if the period of record can be overlooked, the better:

In any case, a station with a 6-year period should never be used as “normals”. They don’t make “normals”. Only exception for its usage could be very remote/high altitude locations in which the data serves for rather illustrative purposes, for instance, data for a Mt Everest base camp at +6000 m above the sea level.While it’s true that the recent years were among the hottest in almost everywhere in the world, they weren’t THAT MUCH hotter compared to the 1991-2020 period overall. For instance, in Finike, Turkey (the closest Turkish station I’ve got this info), the 1991-2020 average is 19.8C and the Sep 2018-Feb 2024 average is 20.5C, expectedly higher than the 30-year normals but nowhere near the 2C difference suggested by the Kastellorizo station. Therefore, the different period of records CANNOT EXPLAIN the discrepancy.
(2)
So, it is either local effects due to the specific location or the quality of the data. The different equipment used for different weather stations SHOULD NEVER result in different readings, at least not outside a very small margin. This is what STANDARDS are about.

This disappointing (but not unexpected) comment gives me the clue that you have no idea about what you’re talking about.

As geographically complex as the Eastern Mediterranean is, it is by no means unique or extreme, nothing unseen everywhere else in the world, and no matter how local effects impact every spot, they are ultimately subject to both synoptic patterns and common forcings caused by simple physics. So, you have both vertical and horizontal movement of air caused by pressure changes and that’s it.

In that regard, the geographic location of the Kastellorizo station is as dull as it gets: an extremely maritime place on the easternmost point of a tiny island that has some low hills that don’t even reach 300 m. Local impact is limited and weather is massively influenced by both the sea and the same regional patterns that affect Southern Turkey, so no matter how much adiabatic warming it gets, Kas will get more for the sake of its location on a sloppy area subject to a much more aggressive vertical gradient.
There are other stations in the area, such as in Fethiye. In fact, Kas (19.9C), Fethiye (19.1C) and Finike (19.8C) are as different to each other and they are to Kastellorizo. Fethiye is located on a flat area, so it gets the largest thermal amplitude and lowest minimums out the bunch thanks to both thermal inversions and least frequency of adiabatic warming. Finike has some features in between. The local geography is wonderfully represented in the slight variations of every one of these three stations.

However, when it comes to Kastellorizo, it doesn’t make sense anymore. The station is mostly surrounded by the sea, and the only geographic features which may cause any disturbance are in the west, as in Finike, but they are much smaller in both size and surface, so there is no way they can disrupt the local climate in such an extreme point. If there is one, you are the one the provide a reasonable explanation. As for me, the only option left is that the station provides bogus data.
(4)
The picture of the station that you posted, as well as other pictures of stations from this network, are red flags to me. A red flag doesn’t mean certainty but “danger”, something you must watch because it doesn’t look right, and effectively it matches the concerns raised in the previous point.

When you are into civil works, project management and maintenance of infrastructure, you can foresee who gives a shit about a job. A good project has strict design plans, a set of materials and procedures examined by professionals, quality control, etc.

The stations of the National Observatory of Athens look like a rush job to complete on a deadline whose goal is having it done instead of providing good results. It looks as if they had lightly surveyed where there were idle iron poles where the equipment could be hung, some electrical terminal to power the station, M2M or Ethernet connection, and that’s it. The work I see does not suggest, for example, that the people in charge are committed to periodically calibrating the equipment or checking that the data make sense at all. Unfortunately, I’ve been myself involved in some works where the client only wanted to complete a checklist so that some politicians could boast about the job done, with absolutely zero interest in having it properly done.

Maybe because I come from a country which has systematically done this is that it infuriates me when people defend mediocrity while embracing random nationalistic sentiments. And it is doubly painful when the other person has common interests that (I consider) might even be socially important on the bigger picture, but are foolishly wasted.

Check my earlier post on Kasos and Psari Forada. We do get around higher winter highs locally and also we have dry winters in various areas of the south Greek isles. In fact precipitation in the extreme south is almost never through prolong wet periods. These are sporadic storms that falls mostly within a couple of days per month and then we are back to sunny weather. 

I do not know. But If a war broke out between Greece and, for example, Spain, which one is warmer, I would support Greece.
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why?

It's because you are clueless that's why. 

lol

Below how Kas Marina vs Kastellorizo WMO compare with the same type of Davis fan aspirated stations. Unfortunately even though Kas Marina started operation in April 2023 there are many daily gaps between Apr 2023 and Nov 2023.

So for only the 3 full months of parallel operation below u can see how they compare. Extremely close monthly means. Slightly higher minimums in Kastellorizo as to be expected due to the fact that it is an island with stronger maritime influences and Kas is on the Turkish mainland.