Operating temperatures - HD vs SSD makes a difference?

I know that Apple recommends that all Mac notebook computers be operated in an ambient temperature between 50ºF and 99ºF (10-35ºC). I thought that the low end was due to the mechanical nature of hard drives and optical drives, although the same recommendation is given for the latest ones that only come with SSDs and have no optical drives. I did think about the fan motor and perhaps the chemical nature of the battery, but I generally use mine plugged in.

Since I swapped out my HD for an SSD, I thought maybe it would be less sensitive to colder ambient temps. In my background I remember that cold temperatures are generally never a problem with any electronics, and they can actually operate much faster when placed in a colder environment.

iPads and iPhones are rated for a considerably lower operating temperatures (down to freezing) although they have no mechanical parts other than buttons and switches that shouldn't be terribly sensitive to the cold.

Any thoughts on this. It's been somewhat cold (we've had summer-like temps here last week) but now it's back to typical winter weather. I so leave my MBP out overnight in sleep mode without any heat.