INTRODUCTION: Climate change is the result of human activities. Recent research indicates an increase in global average temperature of 4.8 °C over the twentieth century. Temperature change affects agriculture, transportation, water resources, architecture, energy production, energy consumption for heating and cooling buildings, vegetation, flowering, and harvesting, melting snow, and etc. Parameters including days’ degree, the energy required for heating and cooling, and other activities at intervals (monthly, quarterly, and annual) are calculated. In most parts of the world to calculate the heating degree daybase temperatures are of 10, 12, 14, 16, 18, and 20 °C.