Final answer:
The term 'unseasonably warm' implies that the weather is warmer than expected for a given time of year, often leading to weather-appropriate clothing choices that differ from the norm.
Step-by-step explanation:
When someone says it is 'unseasonably warm,' they mean that the current weather conditions are warmer than what is typically expected for that particular time of year. This can refer to a period where the temperatures are higher than the average historical temperatures for a specific season, such as experiencing summer-like weather during the spring or fall. For instance, wearing light clothing such as shorts and t-shirts during a month that usually requires heavier coats and sweaters would be indicative of unseasonably warm weather. This phenomenon can be affected by various climatic factors, such as changes in ocean currents or the presence of high-pressure systems that might bring in warmer air from different regions.