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Snow needs to fall and touch the surface when its sub zero.
No it does not
If it falls and the snow is heavy enough, it will stick! The cold from the snow will then freeze the bottom layer and it will stick to the ground as the ground gets colder
If it falls and the snow is heavy enough, it will stick! The cold from the snow will then freeze the bottom layer and it will stick to the ground as the ground gets colder
Uhm, the thread title is "what is the highest latitude that has never recorded a frost".
Well, that's quite related because of the abnormal weather relative to the latitude. I think it's somewhere around western Europe, but I can't find it and the weather data is very poor in those places.
Skellig Islands situated 13km SW of Valentia may not have dropped below freezing, we wouldn't know though, as not every single location in the world has a weather station. And Bishop's Rock has never gone below freezing & that's not in Spain you plank
Also I have seen snow fall & LAY at above freezing. It happened in Portsmouth in April 2008, the temperature never dropped lower than 3C & the snow lasted on the ground for most of the day, despite it reaching 14C that afternoon!
Does not necessarily mean they had a frost. It has to be <0º C to form snow - way up in the air where the snow is formed. If the crystals are large enough, they can briefly survive in warmer air just above street level. It is not unusual to see snow when the ambient air temperature is +4º C, and it has actually been recorded at +14º C (of course, if the surface itself is +2º C or greater, it melts the instant it hits the ground and cannot accumulate).
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