The NEC3 form of contract treats the impact of weather more empirically than other forms of contract. Its method fundamentally eradicated the subjectivity of impact associated with the more traditional approach.
The following is a presentation I prepared and delivered several times to the construction, design and client teams during the course of successfully delivered contract valued £100 million.
Links:
[1] http://www.planningplanet.com/category/filed-under/accepted-programme
[2] http://www.planningplanet.com/category/filed-under/compensation-events
[3] http://www.planningplanet.com/category/filed-under/met-office
[4] http://www.planningplanet.com/category/filed-under/metrological-office
[5] http://www.planningplanet.com/category/filed-under/nec3
[6] http://www.planningplanet.com/category/filed-under/nec3-and-weather