The weather in Changsha is hot in July and August. Xiaohua counted the daily maximum temperature for ten consecutive days and got the following set of data in turn: 34.

According to the definition of median and mode, the original data are arranged from small to large as 34, 34, 35, 36, 36, 37, 37, 37, 37, 37, so the median is the average of the fifth and sixth numbers 36; The most common data is 37, so the mode is 37.

So choose a.