The start of autumn varies based on the calendar one follows. The meteorological calendar marks the season's beginning on September 1, while the Celtic calendar considers it to have started on August 1. The astronomical calendar, however, defines the start of autumn as September 23. Celebrations like Lúghnasadh in County Kilkenny highlight the Celtic perspective, emphasizing the connection to nature and seasonal changes.
Weather officials in Northern Ireland are preparing for potential flooding this autumn, particularly after a dry summer. The meteorological calendar aids in tracking weather patterns, while astronomers note that celestial events also define seasonal changes, impacting both cultural practices and weather preparedness.