Image caption
Crew members remove the forms from the concrete foundation for a new 80 foot tower at Aldrich Mountain in Grant County, Oregon, on December 11, 2013. Builders can only pour concrete between a given range of temperature and moisture conditions, and figuring out how many days in a given period are likely to meet those requirements might help project managers and insurers reduce the risk of costly delays. Photo by Oregon Department of Transportation, used under a CC license.