Don't over simplify.
Earth has areas with the same climate as both examples of Delta Vega.
A planet doesn't have to have just ONE type of environment.
The lithium cracking station seen in WNMHGB was on one part of the planet, Scotty's exile station was on another, likely at one of the poles.
It's also been generally agreed that Vulcan and Delta Vega are NOT in the same solar system, and Spock's seeing the destruction was symbolic, not literal. It was part of the mind-meld as he relayed information to Kirk.
Let's face it, it'd be hard for two planetary bodies that both were class M to sit that close in space to each other. If Earth's seas are affected by something the size of the moon being near us, what do you think would happen to two Earth-type planets being as close to each other as Vulcan and Delta Vega seemed to be in the meld image?
Wait it was symbolic? Not literal? He was standing there, looking up, for God's sake...
I thought the whole point of the mind meld was to show Kirk what Spock had seen thus far, and to prove to him that he is indeed Spock..
You probably know something about this that I don't, but for it to have been "symbolic" makes Nero's efforts fruitless...the whole point of not killing Spock Prime on the spot was to dump him somewhere close to Vulcan so he could see it implode...he also told Alternate Spock that "I want you to see something" (paraphrasing), meaning that he wanted
both Spocks to be within visual range of Vulcan's destruction
I mean, Spock Prime says "Jim, I have just watched my planet's destruction" (paraphrasing, again)
I dont understand how that was symbolic, but I'm sure you'll enlighten me..

hopefully??