Different types of algae seem to thrive at different temps. I have a small pond in my yard and notice in the early spring, when the temps are mid 50s in the day, I get a profusion of hair algae. Once it starts to warm up, I see the hair algae disappear and the suspended algae forms take over.

There is another form of algae in there that survives all Winter (30-40 degrees). Of course, in the pond the algae is a good thing. Keeps the fish happy.

Wayne