In a word cold....its been the coldest month this year .l visited the upper Boyne region yesterday. The water Temp was 17 and that was in the afternoon . No sign of Gray Nomads or Fish.The Main basin of the dam has higher water temps and the odd Fish There seems to be a small window about dusk when they are looking for a feed..This can last anywhere from five to 30 minutes ..Lures that seem to work change from day to day .. Somedays the slow roll of a hardbody does the trick or a soft plastic worked quickly through the shallows. it just depends on the day and location..You dont have to find the warmest water either Its a combination of things.. So the more{ pieces} that you have in the one area the better..