Cold water and below average temperatures of spring are a byproduct of either cold winters that linger, or unrelenting cold fronts that either come weekly or stall out over us. Believe it or not, several springs in years past were noteworthy for how cold they were. I vividly remember May of 2015 when it snowed and remained in the 30's and 40's through mid month. Everything stalled out and became dormant as a result.  If chilly weather like this persists into April (most likely) and May (it can happen), plan on adjusting your approach and strategy by drastic measures. Water temperatures in these instances will barely increase from 40 degree range, or not at all, resulting in much of the lake’s biomass and aquatic ecosystem to stall in stagnation and dormancy.  And instead of proceeding forward with their spawning migrations, fish will sit idle and inactive, and remain positioned in staging locations which may be off deeper secondary edges or the immediate dropoffs along the outskirts from where they invade for eventual spawn.  Or, they will bypass movements altogether and set up in the extreme shallows of the lake if that waterbody offers them