And here is a quick temperature guide to swimming in the sea: Cold water swimming temperatures in centigrade/Celsius: Mid 20s degrees: warm enough for everyone.
20C: You might like a wetsuit for longer swims but not necessary. 18C: Time for a wetsuit unless your swim time is quite short. Water under 70℉ (21℃) is considered cold and can cause you to have a harder time breathing.
Breathing begins to be affected. This is why the official water temperature required for Olympic swimming competition is 77-82F (25-28C). 70F (21C) Treat any water temperature below 70F with caution.
Don't Swim if Your Pool Water Is Below 70 Degrees
According to the National Center for Cold Water Safety, water temperatures below 70 degrees Fahrenheit should be treated with caution. The “perfect” temperature for a swimming pool tends to range between 77 and 82 degrees.
17-20 DEGREES: Summer swimming
Still fresh on entry, but comfortable picnic lazy-hazy summer swimming.
And being so close to the commonly approved ideal climate, temperatures of 20 degrees will make you feel comfortable. Ideal fabrics during this period will be cotton, satin, acrylic, denim, faux leather, suede, and lightweight polyester fleece.
20C is 68F. Awfully hot to maintain dry ice but nowhere near hot enough to melt lead.
For all around use, Australian swimming pool temperatures are best around 26 degrees Celsius to 28 degrees Celsius. 26 degrees if you're planning on some brisk swimming and the less activity you plan to do, the closer to 28 you should set the pool's temperature to.
Hypothermia can happen within minutes of falling into cold water, but the symptoms generally develop gradually. When the water temperature is 40 degrees or below, serious injury can result in as little as a few minutes.
Mid 20s degrees: warm enough for everyone.
Hence the state of water at a temperature of -20° c is ice.
Lack of healthy red blood cells in the body also known as Anemia can be a major reason why you are always feeling frosty. Red blood cells are responsible for carrying oxygen throughout the body and if for some reason your body doesn't make enough of them then you might feel colder than others.
A comfortable room temperature for most people is usually between 18-20 °C, however it largely depends on the individual. Whatever the season, it is recommended that you use a thermostat to monitor how the temperature fluctuates throughout the day.
Some studies showed solid evidence that cold-water swimmers often experience significant improvements in overall cardiovascular health. Cold-water immersion triggers a “shock response” that stresses the cardiovascular system and elevates the heart rate – a chief goal of high-intensity heart-healthy exercise.
Because temperature is a measure of the microscopic energy of atoms (or molecules), the temperature doubles if the microscopic energy doubles. That being said, going from 10°C today to 20°C tomorrow isn't doubling the temperature (even though 20 is twice ten).
The Energy Saving Trust recommends heating your home to between 18 to 21 degrees celsius during winter. And The World Health Organisation (WHO) suggests 18 degrees is the ideal temperature for healthy and well-dressed people.
So, in answer to your question, 10 degrees Celsius is colder than 20 degrees Celsius.
“The safety of wearing shorts in the winter really depends on what the temperature and wind-chill is outside,” said Dr. Levine. “When it starts to fall below 40 degrees, and worse, below freezing temperatures, anyone will be at risk for developing things like frostbite or hypothermia.
Cold (20-39 degree Fahrenheit)
For adults and older children, start with a heavy base layer set on both the top and bottom. Then add in a lightweight synthetic insulated midlayer, like a lightweight puffy jacket. As with warmer temperatures, enclose the entire system in a waterproof-breathable shell jacket and pants.
There's no real optimal temperature, but many people feel “comfortable” swimming in water that is 70° to 78° Fahrenheit.
You may have heard someone mention “the 20 degree rule” when it comes to your air conditioning unit. But what does that mean? Simply put, it means you should never set your thermostat for a temperature more than 20 degrees cooler than the outside air.
Us humans can usually keep our body temps up to near normal in 19c water for awhile. Much below 19, it's more difficult to keep the temp going - you will go into hypothermia much sooner. 19c water (about 67F) is ok to jump in, splash around and get out.
If you're planning a holiday and trying to work out what the ideal sea temperature is for you, typically anything between 18°C and 26°C is considered to be comfortable for swimming, although this is somewhat down to preference.