In short, if the weather for your trip is so bad that we cancel the trip before departing, you'll receive a full refund. Circumstances like this are relatively infrequent and cancellations of this type typically only happen in the event of a typhoon. Very rarely, on our off season tours, cancellations may occur due to heavy snow fall which deems summiting unsafe. You can review the tour terms and conditions here.
Note that trips will go on even if there is rain or wind as long as it is within safe parameters. This is why it's so important that you bring all the right gear. Review the equipment requirements here and make sure you have everything!