The aeration may not have a big impact on the winter water temperature of your small shallow pond that receives stream water depending on the size and volume of the stream. Streams in harsh winter conditions can have water temperatures near 32F. Stream inhabitants have to tolerate this to survive winter. If the stream flow into the pond is significant where the pond water retention time is relatively short (several days), then this inflowing water colder than 39F will significantly cool the pond. Monitoring the winter water temps of both the stream and pond would be about the only way to accurately evaluate the pond water temps during winter.


aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management