Shrug, I'm not a metrologist to be able to explain everything that goes into why it's normal to have -25C days in the winter here. Our cold snaps are down to -35-40C, not -25C.
I didn't respond to your other point for a reason. I only responded to your 'I assume this is a thing in the US' to correct your assumption. Do with that what you will.
This isn't necessarily true. If you are using an identity provider, you can still perform a password reset on GitLab and set a password there, bypassing your 2FA on GitHub. You usually shouldnt rely on IdP 2FA unless the destination system enforces IdP signin every time. There is a group setting in GitLab that does that, but it will only apply for that group.