I’m wondering where this fits in the post-survey options. I’m in Melbourne where we’ve just gone from winter to summer with no spring in between, and my garage has gone from a near-perfect 12-14 degrees to 25-30 with humidity. I’ve got a good fan setup but it’s simply hot and humid, hence workouts feel harder. Do you just select ‘Other’ for this?
I’ve wanted a specific option for this before too (Brisbane). I always put a comment against it so I can remember why my HR was higher than usual, but a post-survey option would be nice.
No, I would just answer honestly. After all, the purpose of the survey is to make sure that your workouts are doable. No use answering “if it were less humid, I’d be faster” 
PS I live in Japan, and it gets very humid here, too. My liquid intake doubles in the summer.
Struggling due to environmental conditions is legit though. If you’re outside certainly wind, heat, rain, etc. all can impact speed and effort drastically. Certainly there is less “environment” in the garage but too hot is a legit reason for struggling or for feeling awful.
Yes, like I wrote, I know from first-hand experience what humidity does to my body.
Heat and humidity will be detrimental to performance. That means you might not be able to progress as quickly in your workouts. So I think you should be honest in the post-workout survey. The post-workout survey is not a judgement on your character or how hard you try. It is meant to give feedback to AT to give you manageable workouts. And if — because of the heat and humidity — you cannot finish certain workouts, that’s valid feedback, I think.
If it’s always like that then it’s probably a failure due to intensity (body temp being one aspect) as you want TR to adjust down a bit until you can handle the heat.
If it was one freak day of heat, just put it down as technical (ie my fan broke, normally I can cool down) as you don’t expect it to impact you in future workouts.
I select ride outside.
I also live where it’s very hot and humid for most of the year. I just answer normally, because like @OreoCookie mentioned, I want to give the feedback in a way that properly influences all of my workouts going forward. I just accept as fact that my RPE will go up in summer and down in winter (and my PL’s will take an inverse impact).
I tend to take my workout out when it gets too hot but it never really gets too humid in the east of England. My first indoor ride at the end of summer (25 Aug) saw my garmin record an average of 23deg C which cracked me though. I marked it as fatigued.