The 31-year-old had been on trial at the Glasgow club, who were promoted as Scottish First Division champions last season.
"I've been here for nearly four weeks now so it will be good to get playing as an actual Partick Thistle player," Kerr told the club's official website.
Meanwhile, the Jags have also handed a new two-year contract to 22-year-old defender Conrad Balatoni.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Dundee UnitedDundee Utd | 36 | 22 | 9 | 5 | 73 | 23 | 50 | 75 |
| 2 | Raith Rovers | 36 | 20 | 9 | 7 | 58 | 42 | 16 | 69 |
| 3 | Partick ThistlePartick | 36 | 14 | 13 | 9 | 63 | 54 | 9 | 55 |
| 4 | AirdrieoniansAirdrieonians | 36 | 15 | 7 | 14 | 44 | 44 | 0 | 52 |
| 5 | Greenock MortonMorton | 36 | 12 | 9 | 15 | 43 | 46 | -3 | 45 |
| 6 | Dunfermline AthleticDunfermline | 36 | 11 | 12 | 13 | 43 | 48 | -5 | 45 |
| 7 | Ayr UnitedAyr | 36 | 12 | 8 | 16 | 53 | 61 | -8 | 44 |
| 8 | Queen's ParkQueen's Park | 36 | 11 | 10 | 15 | 50 | 56 | -6 | 43 |
| 9 | Inverness Caledonian ThistleInverness | 36 | 10 | 12 | 14 | 41 | 40 | 1 | 42 |
| 10 | Arbroath | 36 | 6 | 5 | 25 | 35 | 89 | -54 | 23 |
| > Scottish Championship Full Table | |||||||||
