I've got the following raw data from by viewing the source at https://etherscan.io/charts/difficulty .
data: [ {y : 0.121, dt : 'Thursday, July 30, 2015', },{y : 0.603, dt : 'Friday, July 31, 2015', },{y : 0.887, dt : 'Saturday, August 1, 2015', },{y : 1.020, dt : 'Sunday, August 2, 2015', },{y : 1.126, dt : 'Monday, August 3, 2015', },{y : 1.217, dt : 'Tuesday, August 4, 2015', },{y : 1.328, dt : 'Wednesday, August 5, 2015', },{y : 1.381, dt : 'Thursday, August 6, 2015', },{y : 1.471, dt : 'Friday, August 7, 2015', },{y : 1.586, dt : 'Saturday, August 8, 2015', },{y : 1.709, dt : 'Sunday, August 9, 2015', },{y : 1.838, dt : 'Monday, August 10, 2015', },{y : 2.036, dt : 'Tuesday, August 11, 2015', },{y : 2.207, dt : 'Wednesday, August 12, 2015', },{y : 2.337, dt : 'Thursday, August 13, 2015', },{y : 2.671, dt : 'Friday, August 14, 2015', },{y : 3.378, dt : 'Saturday, August 15, 2015', },{y : 3.632, dt : 'Sunday, August 16, 2015', },{y : 3.908, dt : 'Monday, August 17, 2015', },{y : 4.378, dt : 'Tuesday, August 18, 2015', },{y : 4.420, dt : 'Wednesday, August 19, 2015', },{y : 4.469, dt 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And here's the hashrate data from https://etherscan.io/charts/hashrate:
data: [ {y : 23.7569, dt : 'Thursday, July 30, 2015', },{y : 48.1584, dt : 'Friday, July 31, 2015', },{y : 55.2709, dt : 'Saturday, August 1, 2015', },{y : 64.1779, dt : 'Sunday, August 2, 2015', },{y : 69.8559, dt : 'Monday, August 3, 2015', },{y : 76.6115, dt : 'Tuesday, August 4, 2015', },{y : 81.9449, dt : 'Wednesday, August 5, 2015', },{y : 82.9366, dt : 'Thursday, August 6, 2015', },{y : 89.6063, dt : 'Friday, August 7, 2015', },{y : 97.6083, dt : 'Saturday, August 8, 2015', },{y : 102.5407, dt : 'Sunday, August 9, 2015', },{y : 113.1109, dt : 'Monday, August 10, 2015', },{y : 126.6631, dt : 'Tuesday, August 11, 2015', },{y : 132.7661, dt : 'Wednesday, August 12, 2015', },{y : 144.8995, dt : 'Thursday, August 13, 2015', },{y : 183.5527, dt : 'Friday, August 14, 2015', },{y : 213.9622, dt : 'Saturday, August 15, 2015', },{y : 220.8548, dt : 'Sunday, August 16, 2015', },{y : 245.4865, dt : 'Monday, August 17, 2015', },{y : 253.7123, dt : 'Tuesday, August 18, 2015', },{y : 269.2527, 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