Originally posted by smittims
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As a kid one expected temperatures no higher than 15C after 10 October; in recent years those highs have extended much further into the autumn, partly as a consequence of global warming re-arranging the global weather circulation and, more recently still, causing many blockages as a result of Arctic warming weakening the vigour of the N Atlantic jet stream, so that the surface circulation arrives greatly warmed from sources much further south than formerly. In fact this is just a matter of "luck" - were the blocking highs to the west of us instead of lows we would be in considerably below average temperatures, as the Midwest are presently discovering in the States!
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