Nimbo clouds produce rain. Nimbostratus clouds are full of water, so sunlight cannot get through it, that is why the sky is dark when there are storm clouds above.
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Good Weather
Typically clouds that produce precipitation will have either the Nimbo- prefix or -nimbus suffix. Clouds that produce precipitation (rain, snow, sleet, hail...etc) will normally appear lower in the sky such as the Nimbostratus & Cumulonimbus.
hot sunny days
Nimbo-stratus and stratus clouds form at low altitudes.
Basic stratus clouds normally produce a light drizzle and sometimes snow.
Cumulus clouds usually indicate fair weather.
It means storms when nimbo is added to a type of cloud.
nimbus clouds
High Pressure Systems keep clouds from forming, and prevents precipitation. So it would bring sunny weather.
Probably cumulus pronounced as it is spelled- Cum- You-Luss. these are normally fat and spread out clouds. Cumulonimbus, howver are thunderheads or heavy Rain clouds associated with thunderstorms. In Weather talk Nimbus by itself means rain or is associated with rain- Nimbo-stratus- high level rain cloud. etc.
Rain clouds...obviouly!