Weather means atmospheric conditions including wind, temperature and precipitation, often in a specific area or at a specific time.
Weather refers to atmospheric conditions such as wind, temperature and precipitation, all of which have a large influence over aviation activities, especially flights. Weather is a key factor in flight planning but also affects aircraft equipment and design, and is always included in flight training.
National weather services usually prepare aviation-specific forecasts and other information, and there are international formats for describing weather in aviation terms. Among the most well known are METARs and TAFs, which are current observations and forecasts for a specific airfield or weather observation point.
This tag is appropriate for all questions where weather is a factor, including weather observation and forecasting (for aviation specifically); the effect of weather on aircraft and flight planning; in-flight operational considerations etc.