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SESK: Stuff Everyone Should Know · sesk.info/fish-cold-water-shock

Water is 55 degrees F. How dangerous is cold shock?

As dangerous as much colder water.

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  1. Harmless above 50 degrees
  2. As severe as in 35 degree water ✔
  3. Only a risk for poor swimmers

Why: NWS says cold shock can be just as severe in 50 to 60 degree water as in 35 degree water. Sudden immersion can trigger gasping and rapid breathing.

Huh, didn't know that: Gasping can be triggered by water as warm as 77 degrees.

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References

Answer: As severe as in 35 degree water. NWS says cold shock can be just as severe in 50 to 60 degree water as in 35 degree water. Sudden immersion can trigger gasping and rapid breathing.

  1. NWS Cold water safety www.weather.gov/safety/coldwater
    Cold shock can be just as severe and dangerous from water temperatures of 50-60°F (10-15°C) as it is from water at 35°F (2°C).
    Checked 2026-10-10.
  2. NWS Cold water safety www.weather.gov/safety/coldwater
    Wearing a life jacket significantly increases chances of survival.
    Checked 2026-10-10.

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