Uuni performs well all year long, rain or shine...even at Uuni HQ in 'Sunny' Scotland. We have successfully used Uuni in up to -22˚C. 

Just remember to leave the chimney cap on while the Uuni is not in use. We would also advise against leaving the Stone inside the Uuni when it is not in use as moisture can affect the way that it cooks. We recommend holding on to the Stone's original box as a storage method. Please be sure to wait until the Uuni has completely cooled down before removing the Stone.