Runway Conditions
Winds out of limits... something like 40 kts across a dry R/W,and 30kts across a wet one.
Runway contamination..typically>3 inches of dry snow or >1/2inch of wet snow/slush/water.Greater depths than these can affect acceleration and damage the underside of the plane.
On very short wet R/Ws,a T/O might not be possible because of performance problems.
Icy,slippery R/ws may also produce performance problems in the 'stop' case.