Invalidity is more important than usual this round, so I will post my reasoning for each orange answer.
The category stated that the thing in question needed to be used during or after a specific weather condition. Both pools (as in puddles) and petrichor (defined as "a pleasant smell that frequently accompanies the first rain after a long period of warm, dry weather") occur after rainfall. However, these things do not have any common practical usage, and are thus invalid.