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Greetings Walrus, I have rectangular sun pictures taken at temperatures near 0 degrees C, as the one that should be posted along with the text.
It is a combination of things, such as air densities above, not necessarily with air immediately off the ground. UK and Ireland usually gets upper air from Greenland, however it is mixed with warner gulf stream air. But that does not always happen, as you have noted. There is also summer time events, extremely rare but possible as with the case in Leekshire in the 17th century.
Wayne PS
Something is not right. This message is just to keep things from messing up down the road