No, it wasn't cold yesterday. It was 85ºF here. A welcome warm day after weeks of chilly weather. I'm trying to become efficient at converting from Fahrenheit to Celsius, but let's face it, without a calculator, there is no way for this gringo to get it exactly right. I mean, I can do the subtraction part in my head (Temp in Fº - 32). But then you have to multiply that by 5/9. 5 divided by 9 is 0.55555556. If I round that to 0.5, then it's possible for me to make the calculation in my... ummm, senior citizenized head. No offense to you geriatric brainiacs. But if I round 5/9 to 0.5, then the temperature in C. will be off by a few degrees. In other words, if it is 104ºF, I might tell someone that it is 36ºC ( 104-32 x 0.5 ). The correct answer would be 40ºC. 36ºC would be 96.8ºF, much cooler than the actual 104ºF! The difference between copiously sweating and more copiously sweating.
Now, if you want to convert from Celsius to Fahrenheit, here's how: (9/5 * Tc) + 32 = Tf. So, if it is 40ºC you multiply 9/5 or 1.8 times 40 and add 32, which =104ºF. Forget about rounding the 1.8 up to 2.0. That would come out to 112ºF and I would most likely submerge myself in the pool for the entire day in an attempt to avoid most copiously sweating.
Here's what I have come up with. Between 21ºC and 27ºC is perfect (70-80ºF), between 28ºC and 34ºC is warm (82-93ºF) so dress appropriately. Between 35ºC and 39ºC (95-102ºF) is hot, so be prepared to sweat and ALWAYS walk on the shady side of the street. When the thermometer tops 39ºC, I plan to stay in or near the pool whenever possible. Oh, and 20ºC and below (but not too much below) is ideal for sleeping sin A/C.
Finally, if my body temperature is greater than 37ºC (98.6ºF), I will need to take some acetaminophen because I have a fever. If it hits 40ºC or higher I should probably visit the servicio de urgencias.