Observe the Weather Day is an unofficial holiday celebrated worldwide every January 25. It honors individuals who observe the weather, both professionally and recreationally, highlighting the importance of weather observations in forecasting. The origins of this day are unclear, but it has been celebrated since at least 2012. People engage in various activities, such as learning interesting facts about weather and climate, observing the weather from outside or home, and organizing community events. Additionally, participants often promote the holiday on social media using the hashtag #ObserveTheWeatherDay. This day reflects a long history of weather observation, dating back to ancient civilizations and evolving through significant advancements in meteorology, particularly during the Renaissance and the 19th century.