This is a summary report of key findings from the ‘Big SAD Survey’ conducted between February and April 2022 as part of the ESRC-AHRC funded project ‘Living with SAD: practicing cultures of seasonality to 'feel light' differently’. The project aims to develop a greater understanding of people’s experience of self-ascribed and clinically confirmed ‘Seasonal Affective Disorder (‘SAD’ hereafter) and ‘seasonal affect’ and ‘lowered winter mood’ in particular, in order to develop new public resources for the diverse publics living with disruptive seasonal feelings. It also serves as an intervention into public discourses and media that have sometimes discredited people’s experience of SAD in recent years