Interesting thread - I'm always amazed as some people's ability to read anywhere... I think it's akin to the skill of being able to fall asleep anywhere too!
Is noise allowed? The TV or the children? I find it difficult to read with excessive distractions. Unless the book is intensely gripping. I prefer reading with quiet music in the background.
Indoors or out? Morning or Evening? Prefer reading indoors, although I have read a lot more outdoors now I have Kindle which gives you glare-free reading (no, I don't have shares in Kindle, honestly!)
Do you read on sofa or do you prefer to snuggle in bed with a good read? I like both - but snuggling on the sofa with a book requires a fleecy blanket/throw of sorts.
Is a cuppa close to hand? Do you feast while you read? Cup of tea definitely. In the days before becoming a wheat & dairy-free zone, then I would have devoured biscuits as well!
Does everything have to be just so? Ideally, yes - ambiance is important - but if the book is good enough, then your environment can often melt away. (For me this is a sign of a great book as I am very easy to distract!)