The city in europe with the most rain is Bergen, in Norway, with ~250 a year(195 ≥1mm, Manchester gets 142 ≥1mm). And they apparently get two months straight with constant rain every day and night sometimes.
Manchester gets on average 828mm of rain a year, Bern gets 1022mm and Bergen gets 2412mm.
It's not even close to being a standout.
Although fun fact, Capel Curig in Wales gets more downfall(and arguably rain) every year at 2697mm over 206 days(≥1mm), but Cetinje in Montenegro wins with 3300mm over 136 days(≥1mm). It's insane over a few months(Nov->Feb/Jan)