Which breed would be best for the area I live in and hike in a lot?

I own a Beagle-mix and she hates the warm weather. I love to excercise with her though and I like long, endurance type excercising whether I'm walking, hiking, or running.

I will be making another four-legged addition to my home after I finish college next spring. Which breed of those listed below would be okay going for long walks/runs in 20 degree Fahrenheit weather, but also 85 degree F weather?

Newfoundland
Great Pyrenees
Rottweiler
German Shepherd
Mastiff breeds
Saint Bernard

(I am looking for a 100+ lb. breed from the shelter, so most likely mixed with a couple breeds)
 
German Shepherds are a really hard-working tough breed.
They would be good for hiking and would be good in lots of temps.
I think a German Shepherd/Mastiff or Rottweiler/ Shepherd or Rottweiler Mastiff
They are are tough and hardy and could hike a lot =D
 
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