First trial: October 23 2005 at 3:00 p.m., ambient temperature 7 °C (45 °F). One liter of water boiled in 14 minutes. Second trial: December 17 2005 at 12:05 p.m., ambient temperature -6.8 °C (20 °F). One liter of water boiled in 25 minutes. This proves that solar cooking is not only for hot climates. Even people at high latitudes, e.g., Canada, northern Europe, northern Asia and southern South America can use the energy from the sun in more ways than we previously thought possible.Solar cooking at high latitudes - Solar Cooking
Thats quite amazing speed?