I think the bonding aspect of oxytocin could absolutely be applied to a specific climate. I know that personally, regardless of what may be going on in my life, I always feel happy in certain weather/environments. This may be due to having felt happy previously in said environments; perhaps the physical sensation bonds with the emotional sensation such that an emotion can be accessed by recreating the physical environment associated with it.
As long as we're on the subject of oxytocin - I thought I'd relate an experience I had. It may not be entirely relevant, but I found it interesting:
I know oxytocin as "the pregnancy hormone", and haven't really heard it mentioned another context until now. Large amounts of oxytocin are produced and released during pregnancy, labor, and continuing for 9+ months after birth, at which time it plays a role in bonding and maternal behaviour. The presence of oxytocin in the months after birth have been know to cause a new mother to feel scatterbrained and otherwise disoriented.
So...
At the beginning of my pregnancy, I took an IQ test and got 147, which is roughly what I always get. Then, when my daughter was about 10 months old, I took the same test again and got 117. I took it a couple more times to be sure. So my theory is that the high amounts of oxytocin have an effect on IQ, at least temporarily. Perhaps the oxytocin just makes it more difficult to concentrate on something like an IQ test, thereby causing one to score lower. I've also noticed that after pregnancy, I seem have a mild dyslexia. I don't suppose anyone else has noticed a correlation between oxytocin and IQ?