Summer 2021 – forecast temperatures

I noticed this forecast for summer [JJA] temperatures on Twitter from the UKMO and their GloSea6 forecasting system. It seems that they think this summer, despite the current ongoing La Niña event, will be another warm affair (terciles 5 or 6) particularly the further east that you are. With only four of the last twenty summers coming in with negative anomalies they might well be right.

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