Climate forecasts anticipate average weather and climatic attributes weeks to years ahead. Using advanced Earth climate models, forecasters generate predictions. Researchers employ these models to project changes decades ahead under human-induced scenarios. Weather forecasting utilizes science and technology to predict atmospheric conditions for specific times and places. Traditionally and systematically pursued since the 19th century, modern weather predictions are data-driven, integrating meteorology and computer models to foresee atmospheric changes. Selection of forecast models involves pattern recognition, model performance, and understanding of biases. Manual estimation based on pressure changes or present conditions has been replaced by comprehensive computer-based models.