30-30-30 rule
A rule of thumb for when dangerous wildfires may occur: there must be a temperature of…A rule of thumb for when dangerous wildfires may occur: there must be a temperature of at least 30°C, humidity not exceeding 30%, and wind speed less than 30km/h.
Meaning
1 sensesA rule of thumb for when dangerous wildfires may occur: there must be a temperature of at least 30°C, humidity not exceeding 30%, and wind speed less than 30km/h.
Dictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.