It is also really easy to convert from Fahrenheit to Celsius in your head. 77 ℉ is 25 ℃, and each ∆5 ℃ is ∆9 ℉, e.g. 30 ℃ is 86 ℉, 35 ℃ is 95 ℉, 10 ℃ is 50 ℉, et cetera. Just memorizing the conversion on ∆5 ℃ increments gives you an intuitive feel for the Celsius scale, and after using it for a few days you can intuit it without having to do conversions, just as when you go to a foreign country you get an idea for what standard things cost in the local currency without thinking about currency conversions, e.g. anything 25 ℃ and up is “short sleeve weather”, above 35 ℃ is really hot, below 15 ℃ is cool, et cetera. The only reason there is any ‘intuition’ about the Fahrenheit scale is because it is what we are used.
And no, nobody can tell air temperature down to single increments of degrees of the Fahrenheit scale; the heat capacity of air (which is what you ‘feel’ as heat) changes with humidity, and even a modest change in humidity will alter convective change in still air by more than a perceived change in a single degree of the Fahrenheit scale, notwithstanding @FinsToTheLeft point that the temperature of your home is not constant throughout unless you have massive heat sinks (e.g. rammed earth or live underground) to mediate it.