The percent counter on my boinc screen went to 100%. So now I am at 45%, on the second % of what?

I had assumed that 100% would be one complete model run. Apparently not. would love to hear what these numbers mean.
(this may mean i get an rtfm reply which i would deserve as i haven't delved into all the doco but am hoping to shortcut)

my account shows:
HadSM3 Model-Years 108.77
HadSM3 Complete (45-year) Runs 2.42

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100% of what model?
45% of what model?

Look in the Tasks tab of your BOINC manager, where you can see the names of the models.

Probably just looking at the names of the models concerned will answer your question.

Another possibility is a list of all of your tasks.
This is at the bottom of your Account page. Click on the word View alongside Tasks.

PS
Asking on these message sections is perfectly acceptable for getting help. :)