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SESK: Stuff Everyone Should Know · sesk.info/swim-cold-water-77-degrees

Sudden gasping from cold water can be triggered by water as warm as what?

77°F (25°C), warmer than most people expect.

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  1. 32°F (0°C)
  2. 50°F (10°C)
  3. 77°F (25°C) ✔

Why: Water does not have to be icy to cause trouble. The National Weather Service says gasping and rapid breathing from sudden immersion can start in water as warm as 77°F.

Huh, didn't know that: The NWS says the waters around Annapolis, Maryland may be above 60°F for only about 5.5 months a year.

The dad joke
Why did the lake get a sweater? It heard the water was a little chilly under the surface.
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References

Answer: 77°F (25°C). Water does not have to be icy to cause trouble. The National Weather Service says gasping and rapid breathing from sudden immersion can start in water as warm as 77°F.

  1. National Weather Service: Cold Water Safety www.weather.gov/safety/coldwater
    Gasping for a breath or rapid breathing from sudden immersion can be triggered by water as warm as 77°F (25°C).
    Checked 2026-10-12.

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