When the temperature is above 60 or so Fahrenheit, I have little ability to discern by how much without recourse to a thermometer.
When it’s below? I know the temperature within a degree, almost unfailingly.
I date this to three years ago, when, every morning, I meditated in a chair outside, in sweats and a t-shirt, starting in November, until the temperature reached 23 degrees.
(Right now it’s 48.)