I want to know the answer to the following question:
How high could the temperatures have risen to cause the melting?
All the background I'm provided with is that "According to NASA, the most widespread Antarctic surface melting of the past 30 years occurred in 2005, when an area of ice comparable in size to California briefly melted and refroze; this may have resulted from temperatures rising to as high as 5 °C (41 °F).". Is that enough to answer the question?
Answer: yes