Often associated with dark spots are brighter, persistent methane clouds that form around the tropopause layer.
In the summer hemisphere, frequent, thick but sporadic methane clouds seem to cluster around 40 .
The bright collar at 45 latitude is also connected with methane clouds.
There are no methane clouds as the temperatures are too high for it to condense.
Titan has a greenhouse-warmed climate with methane clouds and rain, perhaps even lakes.
As was said above, the methane clouds were directly detected by Voyager 2 at 1.2-1.3 bar by radio occultation.
The instrument package will slowly settle through the organic haze down into the lower atmosphere, through the methane clouds.
The cap and collar are thought to be a dense region of methane clouds located within the pressure range of 1.3 to 2 bar.
Meanwhile, buoyant methane clouds carry more methane vapors to the upper atmosphere.
If this is the case, the dark spots are actually openings in the methane clouds that give the planet its bluish-green cast.