You’ve seen this contraption before; it sits by the bedroom door “so I can feel some sort of justification when I start kvetching about how frakking uncomfortable it’s gotten all of a sudden.” In that photo, it is reading 74.3° F. In the six years since then, it has never once read 74.4°.
In fact, it routinely skips various possible temperatures. It will show 74.5, but not 74.6; if a warming trend is afoot, it will update at 74.7. After noting that it seems to skip three or four out of every ten conceivable readings, it dawned on me what the issue might be: the manufacturer has to sell this device in lots of countries, most of which measure their temperatures in Celsius, thank you very much, and this would require the little electronic brain to update in tenths of a degree Celsius — and 0.1 Celsius degree is 0.18 Fahrenheit degree. This explains it well enough: 74.3° F is 23.5° C, 74.5 is a hair over 23.6, 74.7 is somewhat thicker hair over 23.7. And it will display 74.8, which rounds to 23.8.
I’m not sure which is less useful: the fact that it took me so long to notice that, or that it took even longer to explain it. And while I’m thinking that maybe the Canadians might be pleased, forty years ago they had few kind words for Celsius.