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Off topic for Europe, but New York City averages 17 ice days a winter and its winter average maximum is around 5°C so a high of 5°C can have more ice days. Does a max of 0°C count as an ice day?
No the max must be below 0.0c
NYC has a large sd so temperatures will diverge off the average alot.
Central London, yes. Temperatures have fallen lower than that in the suburbs more recently. -20C will never be a verified temperature, but it isn't totally unrealistic prior to the 20th century, when the Thames froze over, in the area known as Greater London today (which hasn't always been one big urban lump). It was like a totally different climate. Kew may have been a real frost hollow at one point, for all we know.
Central London, yes. Temperatures have fallen lower than that in the suburbs more recently. -20C will never be a verified temperature, but it isn't totally unrealistic prior to the 20th century, when the Thames froze over, in the area known as Greater London today (which hasn't always been one big urban lump). It was like a totally different climate. Kew may have been a real frost hollow at one point, for all we know.
Kew has pretty cold minima for the London area even now. The reason the river used to freeze over was because it used to be wider, shallower and slower. Since the embankments were built, it flows faster and won't freeze again.
Even so, the depth of cold was a lot greater back then. Even if it were slower-moving, I wouldn't expect it to freeze over, maybe a few ice flows during very cold winter months.
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