Yes Nikki the cold too! One of Chris's earliest symptoms was jaw clonus if any cool breeze hit him. We didn't even think anything of it, except to have a little laugh at it.
On his first visit and diagnosis at the MND clinic the neurologist brought a heap of medical students in to observe how easily the clonus could be triggered. It didn't feel funny again after that visit.
Chris developed leg clonus quite late in the progression and it was usually triggered when preparing for a transfer.
You are right about how different each can be. That's one of the things I find so powerful about this forum - so often there are multiple answers due to differences and by having lots of responses, the person asking usually finds the answer that fits their situation.