Darth Lefty - I was not aware that those type of seat posts were a thing. Interesting.
I would say rain and cold is probably my least favorite conditions. But I headed out in the 40F and drizzle this morning. It was a light rain for about 2 miles, then stopped, then started again for another couple of miles, then stopped altogether about halfway through my ride. It wasn't bad, but could've been worse if the rain had been heavier or more constant. Rain pants would have been a good addition had it rained more, but it turned out fine.