  Traditional weather forecasting relies on domain expertise and
computationally intensive numerical simulation systems. Recently, with the
development of a data-driven approach, weather forecasting based on deep
learning has been receiving attention. Deep learning-based weather forecasting
has made stunning progress, from various backbone studies using CNN, RNN, and
Transformer to training strategies using weather observations datasets with
auxiliary inputs. All of this progress has contributed to the field of weather
forecasting; however, many elements and complex structures of deep learning
models prevent us from reaching physical interpretations. This paper proposes a
SImple baseline with a spatiotemporal context Aggregation Network (SIANet) that
achieved state-of-the-art in 4 parts of 5 benchmarks of W4C22. This simple but
efficient structure uses only satellite images and CNNs in an end-to-end
fashion without using a multi-model ensemble or fine-tuning. This simplicity of
SIANet can be used as a solid baseline that can be easily applied in weather
forecasting using deep learning.
