Compost Wizard ThermometerTemperature plays an important role in the composting process. Decomposition occurs most rapidly between 110 to 160 degrees Fahrenheit (44 71 Celsius). With the Compost Wizard Thermometer, you can determine exactly which bacteria are most active and the best steps to take next. Psychrophilic (55 77 F), Mesophilic (70 100 F), and Thermophilic (113 160 F) are the three major groups of bacteria. As temperatures increase, so does the amount of composting