keeders - too many unknowns/variables to get an answer.
What time is 'on-time'?
Is the a/c an inbound/outbound or is it LFBO resident?
If i/o, are the a/c and crew Cat3 capable?
If i/o, will it be delayed inbound by weather?
As Chesty says, there should be no problems for take-off as long as the crew are bad wx qualified and the aerodrome lighting etc is serviceable.
I think this will do better elsewhere.