Precipitation in London in May prediction

The dry start to May is real, but don't confuse a lucky streak with a locked-in outcome. The 5-10mm band is an impossibly tight target – squeezed between a miracle drought and a single ordinary frontal passage. Here's the brutal arithmetic: nearly two weeks still remain on the clock, and Heathrow's May average sits around 50-55mm. One modest front drifting in from the Atlantic, one convective cell over west London, and you're already out of the bracket. British weather doesn't do precision landings. The market has already figured this out. Traders are clustering weight around the 15-30mm bands, not this low slot. Ensemble models are flagging real uncertainty for late May, which means the dry-spell narrative has a credibility problem it can't shake. Backing 5-10mm means believing the jet stream stays locked north for another fortnight without a single meaningful rain event. That's not a forecast – that's denial. Skip this bracket entirely and look at the 15-30mm range, where the rain is already heading.