There is this sentence in which I'm trying to count a number of effects that restoring a currenly dried out lake can have on a particular region. I want to say that after reviving the lake the microclimate in that region will be affected so in winters and summers it wouldn't be that cold or hot because the lake makes the climate there mild:
Restoring Lake X can [the verb] the surroundings climate.
The verb I need means make mild then. Any suggestions?