When daytime temperatures are subzero, keep the heating on permanently, at a low level.
Times, Sunday Times (2010)
The alert will stay in place until 3pm tomorrow, with subzero temperatures overnight.
The Sun (2017)
Baggy jackets plus low-slung trousers equals bare flesh over your kidneys in subzero conditions.
Times, Sunday Times (2006)
Puffas/ subzero parkas are fine if you're sitting around doing nothing.
Times, Sunday Times (2006)
Chop logs, shovel the car out of a snow bank, never leave home without subzero boots.
Times, Sunday Times (2012)
Of all the deep spots, that one is perhaps the least understood because of its remoteness and subzero temperatures.
2019, 'Submersible Is First to Reach Bottom of Atlantic Ocean', Smithsonianhttps://www.smithsonianmag.com/smart-news/private-submarine-first-reach-bottom-atlantic-ocean-180971144/
We've arrived at our subzero bolthole: the three cabins look like nervous sheds in search of an allotment.
Times, Sunday Times (2015)
I'm also ravenous, because of the extra energy needed to maintain bodily warmth in subzero temperatures.
Times, Sunday Times (2014)
As well as taking refuge from subzero temperatures, buyers can take advantage of the seasonally slow housing market.
Times, Sunday Times (2010)
It was precision passing in subzero temperatures, with the snow settling on the frozen pitch.