clouds: tune cloud coverage by weather density

config.js

@@ -152,7 +152,7 @@ window.CONFIG = {
         // only ever reports sunny/cloudy/stormy, so the deck keeps that
         // coverage through the night as well - 'night' is used by the weather
         // simulation (weatherSim: true) alone.
-        density: { sunny: 0.45, cloudy: 0.90, stormy: 1.00 }
+        density: { sunny: 0.12, cloudy: 0.60, stormy: 0.95, night: 0.35 }
         // density: { sunny: 0.05, cloudy: 0.9, stormy: 1.0, night: 0.2 }
     },