A Met Office report says weather once considered extreme in the United Kingdom is now becoming the "new normal" [1].
This shift indicates that the environmental baseline for the region has fundamentally changed, increasing the frequency of dangerous heat events and challenging existing infrastructure.
Mike Kendon, the lead author of the report, said the climate the UK had in the 20th century has "now gone" [1]. The data shows that the last four years are all among the five warmest on record for the country [2].
Specific metrics highlight the intensity of this warming trend in the south. The hottest day of the year in southern England is now typically 4.5 °C warmer than the 1961‑1990 baseline [1]. This increase reflects a broader trend of ongoing climate change shifting temperature norms across the region [1].
Looking forward, the report suggests that current extremes may become the starting point for future peaks. Met Office scientists said a 45 °C heatwave could occur in the UK within the next three decades [3]. Such a temperature would represent a significant departure from historical norms, even those of the recently established "new normal."
The report emphasizes that these patterns are not isolated incidents but are part of a systemic rise in global temperatures. As the baseline shifts, the likelihood of extreme heat increases, making what was once a rare anomaly a regular occurrence [1].
“"The climate we had in the 20th Century has 'now gone'."”
The transition of 'extreme' weather into a 'new normal' suggests that the UK's historical climate data is no longer a reliable predictor for future planning. This shift necessitates a systemic overhaul of public health responses and urban infrastructure to handle temperatures that were previously unprecedented in Northern Europe.
