The building industry is subject to an especially high degree of dependence on weather, climate, and atmospheric conditions in general. On the one hand, the climatologic data is applied for the selection of sites, the proof of weather related delays in construction, the optimisation of energy saving measurements for buildings, the minimisation of heating related consumption of resources, as well as the planning of the fittings for new buildings. On the other hand, the dispatch of workers and machines as well as the safety measures for them depend on weather. To serve the building industry in an ideal manner, the company ask has developed tailored IT solutions, which provide just in time and on-demand the required weather information. The online solutions from ask utilise the latest IT technologies for registered clients as well as for non-registered customers via e-payment methods and are in daily operation.