Although we were there the first week of January 2002. It was 80 the day we arrived, then a cold front came in for our 5-day trip. The highs were in the 50's all week. This means that the temperatures started in the high 30's and rose slowly all day. We were comfortable in our winter coats.
There was STEAM rising off the Wilderness Lodge pool.
And, in the kind of luck that seems to follow me, it was 80 on Leaving Day.
But I do agree with the basic assertion that indoor pools are generally unnecessary.