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This exam report contains studies about how the weather affects the construction site from a planning and productivity perspective. In 1960?s the contractors started to build during the winter, since then the demands to obtain a good construction has been higher on both the contractor and then promoter.In this report you will see how the different actors at the construction site handle the weather problems. By several interviews of the actors at the construction site there have been opinions about the weather situation which has been collected. To get a wide perspective of the problem, field studies from four different construction sites been made.Weather statistics over Halmstad is a mayor part of this report. Wind, temperature and precipitation will be presented in diagrams and tables divided over all months. The point with these tables and diagrams are ment to be a help during the projecting and timetable planning of the construction project. In this report we came up with the following; that weather is a big negative factor on the construction site. The losses related to productivity are mayor, especially during framework. If no consideration is taken to the weather, productivity losses for one year will be significant. From interviews and weather statistics the final result has been that April and May are the most productive months of the year.