The meteorological team measured temperatures of 13°C, 16°C, 25°C, and 18°C at 2:00, 8:00, 14:00, and 20:00 of the day, respectively. What is the average temperature of the day in °C?
气象小组在一天的2点、8点、14点、20点测得温度分别是13℃、16℃、25℃、18℃．请问这一天的平均温度是多少℃．
<gadget id="calculator">13 + 16 + 25 + 18</gadget>
<output>72</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>