Trader consensus on Polymarket heavily favors under 20mm total April precipitation in London at 85% implied probability, driven by official station data showing just 2-3mm accumulated through April 18—around 7% of the 42mm climatological average from Met Office records at sites like Heathrow and local NW3 stations. This exceptional dry spell follows a wet winter but stems from persistent high pressure dominating southeast England, fostering settled conditions and record early-April warmth peaking at 26.5°C on April 8. Forecast models from the Met Office indicate limited rainfall risk for the remaining 12 days, with mostly dry, mild weather ahead, though low-pressure systems could introduce showers and shift odds. Resolution hinges on verified monthly totals from authoritative gauges.