Dates with hottest mean temperature
-----------------------------------
          date  max_temp  mean_temp  min_temp
111  6/29/2012       103         89        74
119   7/7/2012       106         89        72

Dates with coldest mean temperature
-----------------------------------
         date  max_temp  mean_temp  min_temp
328  2/1/2013        16         11         5

The number of days with rain:  121