good weather vs conditions

good weather and conditions both are nouns.

Word	Noun	Adjective	Verb	Adverb
good weather	Yes	No	No	No
conditions	Yes	No	No	No

As nouns, conditions is a hypernym of good weather; that is, conditions is a word with a broader meaning than good weather:

good weather: weather suitable for outdoor activities
conditions: the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation

Other hypernyms of good weather include atmospheric condition, weather, weather condition.

good weather (noun)	conditions (noun)
weather suitable for outdoor activities	the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation
	the set of circumstances that affect someone's welfare
	the prevailing context that influences the performance or the outcome of a process