One is cold water, which the body has to warm up to 37C (98.6F).
Another Powys weather station at Tirabad, south of Llanwrtyrd Wells, saw a new local record of -14.3C (6F).
The BBC weather centre said the highest temperature recorded so far on Sunday was 30.9 (87.6F) in Cambridge.
It is increasingly unlikely that global warming will be kept below an increase of 2C (3.6F) above pre-industrial levels, a study suggests.
As it currently stands, the UN Framework Convention on Climate Change has set a target of limiting the rise in global mean temperature to 2C (3.6F) above pre-industrial levels.
Now tracks one and two of the conference are discussing trying to stabilise emissions at a level projected to have a fair chance of avoiding a 2C (3.6F) temperature rise.
However, the scientists say climate change models suggest temperatures in the area are set to increase by 2C (3.6F), leading to conditions similar to those currently found in the northern range.
BBC: NEWS | Science/Nature | Climate threat has plants quivering
An even more unusual approach is being explored by Alan Fogelman and his team, who have genetically engineered a tomato to produce a small peptide, 6F, that mimics the action of apo A-1.
FORBES: Early Look: New Methods To Enhance Cholesterol Efflux
Writing in the Journal Nature in April, researchers said pledges made at December's UN summit in Copenhagen are unlikely to keep the rise in the global mean temperature to 2C (3.6F) above pre-industrial levels.
The coldest temperature was -13C (8.6F) at Altnaharra in the Scottish Highlands on 8 January, while the strongest gust of wind was 165mph (265.5kph), recorded at the highest point of the Cairngorms mountain range on 8 December.
BBC: 2011 is UK's second warmest year on record - Met Office
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