Water takes much longer to heat and cool than air does, so the ocean temperature near us only varies between about 50-58 degrees through the year.
That has a tremendous moderating effect on our weather. The ~55 degree ocean temperature keeps us milder in the winter, and cooler in the summer.
Tornadoes are usually formed from storms stemming from areas experiencing large temperature extremes -- i.e. a cold front between maybe 60 degree weather on one side and 90 degree weather on the other. But the marine air keeps those extremes from happening around here.