I was at Dachau a couple summers ago in similar weather. I actually found it worse and hit harder because it was such a pleasant day as I watched people stroll around the grounds, taking selfies, kids running around playing. It made me feel like I couldn't even breath.
>>techno+(OP)
I too was at Dachau on a day like that, over a decade ago. My partner recently asked me about it, and just thinking back to how I felt made my skin crawl. It's terrible to remember, and I hope I never forget.