This is not to say that high temperatures in extremely dry climates are not as severe. Phoenix, AZ: 90F, 10 percent humidity = heat index = 85F (dry, you sweat and the sweat evaporates and the real feel temp = 85F is actually lower than the actual air temp = 90F) Miami, FL: 90F, 85 percent humidity = heat index = 117F (humid, sweat it out, seek air conditioned places) = feels like Thailand. ![]() You sweat, it evaporates, no sweat actually sticks to your clothes and it's more like a warm oven when you step outdoors, but it's not that bad. So, 90F in Phoenix, Arizona with 10 percent humidity means it's dry - 90F with 10 percent humidity actually feels like 85F and dry. Now take 90 degrees F in a relatively drier climate in the US in which the humidity is 10 percent, you'll find that the heat index or the real feel temperature only comes to 85F. So despite all warnings not to, you schedule a vacation for Florida in July or August for two weeks and that's all it will take - you'll never come back to the state of Florida in the middle of summer ever again. If you want to test this come to central or south Florida in the middle of summer - either Orlando, Florida, Tampa, Florida or Miami, Florida in July will suffice - try any of the above destinations in July. It's brutal, deceptively brutal in Miami. You can keep rehydrating and you'll keep sweating and the sweat will continue to cling to your clothes until you're literally drenched, but the sweat doesn't evaporate it just keeps adding to the already existing sweat. The sweat sticking to you and the sweat sticking to your clothes won't evaporate in south Florida. You'll sweat in Miami and you'll continue to sweat. In Miami, Florida with a 90 degree F temperature and humidity of 85 percent, this effectively equals a (very humid, sticky) heat index of 117 degrees F. To do this, we'll take relative humidity as humidity and take temperatures in degrees Fahrenheit and pit high humidity (saturated) versus low humidity (dry). I suppose people aren't understanding heat index or the "feels like temperature" because no one has taken the time to quantify what it means. If you say simply it is 10 *C or *F, you know what the temperature is. ![]() A young person will be less cold than an old man, for example, and someone healthy will be also less affected by the low temperatures than someone with a cold. I find this "feels like" temperature confusing because there are differences among people. "Feels like" is meaningless, misleading and potentially dangerous. Temperature says -13C so for the car starting or having trouble starting is it only -13C. With wind chill and dew point /wind chill/Real Feel was -18C this morning. "Does 'feels like' temperature only apply to 'humans' and 'skin'? Does it affect water freezing?"
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