Cold Water: A Temperature Guide – Outdoor Swimming Society Outdoor Swimming Society

Cold water temperature varies hugely, and while this isn't scientific, anecdotally, open water swimmers experience it in these bands.

Winter swimming - Wikipedia

Cold Water Hazards and Safety

Afterdrop & the subtle art of warming up – Outdoor Swimming Society Outdoor Swimming Society

Cold-water swimming: what you can do to acclimatise to the temperature

Winter swimming - Wikipedia

Guide to safe cold water swimming – Williamstown Open Water Swim Coaching

A Brief Guide to Bay Area Open Water Swimming — Odyssey Open Water

Warm Water vs Cold Water: Which is Better for Swimming?

Can you tell how cold you are? – Outdoor Swimming Society Outdoor Swimming Society

Winter Swimming - NOWCA - Official website

How to acclimatise – Outdoor Swimming Society Outdoor Swimming Society