Heavy snowfall in Manali typically occurs during the winter months, primarily from December to February. This period is considered the peak winter season in Manali when temperatures drop significantly, and the region receives abundant snowfall. The months of January and February are particularly known for heavy snowfall, transforming Manali into a winter wonderland. However, it’s important to note that weather patterns can vary, and snowfall can occur earlier or later depending on the specific year and prevailing climatic conditions.