It varies a lot on your definition of best, I personally consider the brazilian Interlagos GP the best, it's a tecnical, fast and very demanding track, but the San Marino GP is by far the hardest, in the 2006 season i think, from the 24 cars that started the race, only 9 finished.
Currently the belgium track
There´s no F1 track in Finland.
India
The hottest day ever in January in Wee Waa NSW was 1/16/1979 when the temperature reached 43.4 degrees Celsius.
There are currently 19 tracks that are classified as a Formula 1 track but historically there have been close to a hundred different circuits.*As of 2013
50degrees
the hottest place in Britain is in the Scilly Isles.
The Suzuka circuit in Japan, measuring 5.773 KM
America's Hottest Cheerleaders - 2013 Hottest Pro Cheerleaders L-A- Auditions 1-1 was released on: USA: 1 March 2013
The highest temperature on Uranus is a chilling 57 kelvin [See related question]57 Kelvin = -357.07 degrees Fahrenheit57 kelvin = -216.15 degrees CelsiusSee related link for more information.
Blue
The 2007 global average temperature was ~14.7C according to NASA GISS. "The global mean temperature anomaly, 0.57°C (about 1°F) warmer than the 1951-1980 mean." The average temperature of 14.01 degrees Celsius in the 1970s rose to 14.26 degrees in the 1980s. In the 1990s it reached 14.40 degrees. See the NASA link below.