T-shirt weather in December is a sign of what winter has in store

It’s the cusp of winter in the Northern Hemisphere, but in many places from the US to Japan, it feels more like spring — and forecasters say that’s a sign of what to expect over the next couple of months, until a late-season cold snap arrives.

In New York City this weekend, temperatures will soar above 60F (16C). Warmer-than-average weather will also blanket London and Tokyo. And longer-term outlooks show mild conditions lingering for much of North America, Europe and East Asia into January.

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