Hi
We just did Radiance last month for Alaska and have done Quantum on another itinerary.
Formal night was just dress your best, some people made the effort but the majority seemed to just wear jeans. In the Dining room there seemed to be no dress code enforced, we saw jeans, shorts, tank tops and baseball caps.
When we were on Quantum, the indoor spaces all seemed pleasant, we are from the UK so it was never cold for us, the solarium pools seemed warm and the whole solarium a nice temp, we did not use the indoor or outdoor pool.
The weather in Alaska in June was changeable, we did a b2b, the first week in Juneau it was raining, the second week it was sunny and in the high 70's.
Hope this helps.