My last four Peugeots - 406, 307sw, 206, and the 208sw ALL flash at +3°C, and sound a warning bleep when they get there.
All continue to flash down to -3°C.
The 208sw is particularly annoying in that it beeps at 10mph if you have not fastened your seatbelt, and it gets louder and LOUDER and
LOUDER even if you fall back below 10mph.
The only way to stop it is to fasten the belt behind you, or slam it into reverse, in which gear you can go like the clappers without the warning bleeps! Driving from the supermarket car park space to the filling station 100 yards away and putting it into reverse is not best practice!
It also bleeps for a door being open, or the rear glass (not hatch) being left undone -
but only after you have set off into traffic!! Of course you have to stop and get out to shut the rear glass, which is not always convenient or pleasant in bad weather or dodgy neighbourhoods!
I did manage to overcome it's desire to automatically LOCK all the doors as soon as you had moved more than 3 feet.
To my mind there is far too much time and money spent on bleeping warning devices, and electronic gizmo's that serve no real purpose, except to comfort idiotic drivers who without them would simply go to pieces - and should probably not be allowed onto the road.
I even got a warning that the battery in the key plipper was failing, over a year before my WIFE'S key finally gave up the ghost - and mine was still going!
The 208 keeps telling me the side light bulb is faulty, because I cannot be bothered to buy and fit a resistor across the LED lamps I replaced the original bulbs with!
Pah! Rant over... as you were!