Ideally, all temp records set under Foehn effect conditions would have some kind of indication of that in their notes.
Their sensitivity to the precise wind direction and moisture profile of the atmosphere usually makes them ineligible for climate trend analysis. While the highest possible temp can be expected to be higher in a warmer overall climate, the required combination of wind direction and atmospheric moisture profile will always be an extremely rare and special event.
Exceptions do exist, mind - places where the topography is fairly smooth, yielding similar results from a variety of wind directions that drive air down the slopes of high ground. I saw a brilliant example of this while on a research trip in northern Finland a decade ago; the tundra environment was cut through on a mountain side by a swathe of ash trees.
The wind was right for the Foehn effect to be in play, so we trekked over there. Our handheld thermometers registered a jump in air temperature of over 10*C, from well below zero to a few above. This was in mid-March.
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