Wash the thermometer in soap and rinse with cool, clean water before and after you use it. Do not use hot water because the thermometer may break. After washing, it is best to soak the thermometer in alcohol for 20 minutes. You can use ethyl, isopropyl, or medical alcohol (ethanol).
1 In 2015, the average temperature across global land and ocean surfaces was 1.62Â°F (0.90Â°C) above the twentieth-century averageâthe hottest year in the 136-year record.  Since 1976, every year has been warrmer than the long-term average.
Temperatures on Earth typically range from 115 degrees Fahrenheit at the hottest to minus 100 degrees at the coolest. The Earth's approximate average temperature is 61... Temperatures on Earth typically range from 115 degrees Fahrenheit at the hottest to minus 100 degrees at the coolest. The Earth's approximate average temperature is 61 degrees. The hottest ever recorded air temperature on Earth was 134 degrees, which was recorded in 1913 in Death Valley, California. The highest recorded surface temperature was higher, reaching 159 degrees in the Lut Desert of Iran in 2004. Antarctica's Volstok Station holds the record for coldest temperature, reading minus 128.6 degrees in 1983.