I am keen to cycle to work most if not all year round but living here on the west coast of scotland we get an awful lot of rain here. How do you guys cope with early morning when it is tipping it down. Even now it is still pretty chilly in the mornings here, we had some snow on Monday here.....
It's pretty dry most of the year around "down south" here.
You will pretty much get wet, if you put on full water proofs you will just get wet from sweat.
So, just accept that sometimes you will get wet and concentrate more on keeping warm, multiple layers are good, you'll want some way of being able to dry them out before you return home as putting on cold/wet clothes is a bad start (even if its wet and warm, that is better).
Consider that not all parts of your body requires the same amount of layers, you will probably suffice with a single layer on your legs even when you have 2-4 up top (some of us around here cycle in shorts most of the year around, legs dry faster than trousers

)
It also seems to be drier the colder it gets, which is a bonus (went out at -17c this year, dry as a bone).