Yes "stewyb" l guarantee that there will be days between May and September that they will not be able to land.
I remember from way back when BMI used to operate from Luton to Jersey during the summer months, when they had long delays and the odd day they could not get in.
Some might remember BA operating a Tristar into Jersey to try and clear a backlog due to weather cancellations.
"ROC10" Airlines will always operate to airports that are prone to weather issues, even if some might say it makes no sense.
Jet2 already operate to an airport that some might say is a risk because of weather, Funchal is that airport.