luc Air France rules state that F/O can't perform approach if visibility <800 m ( regardless of wind)
Flying.Coyote, quoting FROM : AIRBUS CUSTOMER SERVICES TOULOUSE TX530526FVisibility was reported to be 0.5 to 0.25 NM in heavy rain.
Working a conversion from International Nautical Miles to Metres gives:
.25 inm = 463m
.50 inm = 926m