On a certain day in Changting City, the maximum temperature is 12°C and the minimum temperature is -3°C. What is the temperature difference in this day?
长汀城区某一天的最高气温是12℃，最低气温是-3℃，这一天温差是多少℃．
<gadget id="calculator">12 - (-3)</gadget>
<output>15</output>

<result>15</result>