Temperature always too cold
Have you used the Freeze plugin recently?
Yes, I always spawn frozen so I have to unfreeze myself whenever I log into the server first time.
Why do you have it set up to do that?
I don't, all of the config's and everything are default. I just loaded up the server and into the map
The only way you would be frozen on join, is if you granted the permission to be frozen when you shouldn't have. ;)

Make sure your groups and your user does not have the freeze.frozen permission granted. This permission is not intended to be granted to groups or yourself manually, only by the plugin for tracking.

As for the cold effect, in the plugin's configuration:
"Enable frozen effect": true,​
Oh that would be my problem. I gave myself the permission '*' so I got everything. Thank you, this was helpful!
Yup, never blindly grant permissions. ;)