I have done some reading wrt DO and rainwater and found that rainwater carries fair amounts of DO, no real data, just fair amounts.
Yes any activity the disturbs the air/water interface will add DO to some extent. Rain , wind ,aeration , boat motor all do that. While rain does add DO it is not enough to offset the sudden die-off of large plankton blooms and the decomposition of same that uses up oxygen. Large rain events like hurricanes or stalled weather fronts all to often cause fish kills. Oxygen saturated waters have a better chance to meditate the issue on the front end. In those type events as a last resort try to create a DO refuge by using a boat motor to stir the surface and or move the diffusers shallow (3 ft).
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