Mt.Mckinley is not visible most of the time in summer
anyways. As I said in previous posts, you only have 20% of chance seeing it, most of which in winter.
The mountain is so high that it creates weather for itself. In summer months, when all lakes and rivers are running, hot air heats up the water and turns it into cloud covering Mckinley. In winter, when all water is frozen, you have a a better chance seeing it.
If you visit Alaska with seeing McKinley as one of your goals, you will be disappointed, especially in summer.
Of my 5 trips there, I only saw the peak twice, once from air flying down from Fairbanks in winter and a second time this Sept from Anchorage.
Be prepared for the rain any time you visit South Eastern AK, where one of the largest temporate "rain forest" in the world resides.
Another misconception about Alaska is Arctic area. I personally do not recommend visiting Fairbanks and the Arctic area, unless you want to claim the medal of having been to Arctic. Just my personal opinion.