Re: 6 Americans, 1 Brit vanish at sea
I said it before but sailing in June is not that unusual. Cyclone season ends about April. You can try going in April and many do but you take the risk of a late season cyclone coming down from the tropics. There were a few this year. May would have been the preferred time to go but only if the weather was settled. June is normally OK but whatever month you go, you need to watch the systems and pick your opportunity.
No time is without risk but having said that, the vast majority of boats go without a problem.
The storm that hit them was an intense depression that formed quickly, and moved fast. Even with the best weather forecasting, it could have caught them by surprise. The Tasman Sea and area around NZ can be nasty at any time of the year.