okay i can give a unique perspective....since my local lake is a resevoir for a power plant my lake NEVER drops below 55*.....OUR fish don't look for a magic temp to spawn....I've always been told our bass spawn because of light.....the longer the day the more light....the more light the closer to spring...since they can't look for the temp they look for the light..............dunno about your area....thats just around here...............