Room temperature is the number owners record, and it is the wrong one. A thermostat on the wall reads the air at adult head height in the warmest part of the house, while your hedgehog sleeps at floor level, against an outside wall, in the draft that runs under the door. Through the cold months that gap can be the whole story, because a pet hedgehog who gets too cold may attempt a hibernation her body is not built to survive, and the attempt often follows nights nobody knew were cold. Measuring where she actually lives turns a vague winter worry into a set of numbers you can act on early.
Measure at Hedgehog Level, Twice a Day
Place the thermometer inside the enclosure at hedgehog level, beside her sleeping area rather than near a heat source, which would flatter the reading. A minimum-maximum thermometer earns its keep here, because the dangerous moment is rarely the evening check; it is the coldest hour before dawn, and the overnight low is the figure that tells you what she actually endured. Read it morning and evening into a simple dated table with columns for the date, the morning reading, the evening reading, and the overnight low, and reset the minimum-maximum reading daily so each night gets its own honest low. Keep the columns identical all winter, since a table that changes shape in January cannot be scanned for a trend. Note beside the figures what the heating was doing, a thermostat turned down, a window left open, a power cut, so a bad night arrives with its explanation attached. Position matters as much as the instrument: a thermometer clipped beside her heat source will read warm all night while she sleeps cold two feet away, so keep it where she actually spends the night, and check it is still there each morning, since a determined hedgehog can bulldoze a light sensor into her bedding and turn a week of readings into fiction.
Act on Runs of Cold Nights
Read the table weekly rather than worrying over single readings. One chilly night in an otherwise steady run is weather; several falling nights in a row is a heating problem to fix now, by moving the enclosure away from the cold wall, adding safe background heat, or checking the room's overnight thermostat setting, rather than at the weekend. If you find her cold and sluggish, with a cool belly and wobbling movement, warm her gently and gradually against your own body heat or a wrapped warm bottle beside her, and call the vet; never use hot water or a hot pad against her, because rapid reheating can harm her, and an attempted hibernation needs veterinary advice even if she perks up. The table then becomes evidence: it shows the vet exactly how cold she got and for how many nights. Prevention sits in the same routine: know your room's pattern before the first hard frost arrives, because the table's first winter teaches you which nights, windy ones, still ones, or the ones when the heating cycles off longest, are the dangerous ones in your particular house, and that knowledge is what next year's setup gets built around.
Keep the Winter Record With Her History
File the finished table rather than throwing it away with the season. Next winter's first cold snap is easier to judge with last year's figures beside it, and a spring vet visit reads very differently when the temperature history is attached to her weight and appetite notes. Stored inside Pet Passport from KinsLe, the dated table travels with her records as one packet, and a covering vet reads the season's cold pattern in minutes rather than guesses.