During the lifetime of a building, in Sweden normally between 50 an 100 years, the building must withstand climatic impacts. To predict such impacts and to determine design conditions for a building, it is necessary to establish the microclimate load, i.e. conditions prevailing in the immediate atmospheric environment of the building. The usually used long term climatic statistics shows only minor local deviations since it is based on integrated atmospheric processes representing a larger area as an entire city. But for determination of the microclimate load it is important to take into account the widely different scales in space and time of different atmospheric processes as well as the affects of topography, vegetation and land use, urban and industrial activities, not forgetting the influences of the building itself. The study is focused on solar radiation and driving rain since they are very important parts of the microclimate load. The objective of the paper is to verify the transformation of data from a meteorological observation station to data representing an individual building site, i.e. transforming macroclimate data into the microclimate load. The verification of the transformation is made by in-situ measurements of the microclimate. Furthermore, the input to the transformation is taken partly from the local climate observations and partly from the Mesan data for the specific location. Mesan, an objective transformation method for obtaining hourly mesoclimate data from macroclimate data, is developed at SMHI (Swedish Meteorological and Hydrological Institute) and described in (H?ggmark et al. 2000).

• load on building envelope
• solar energy, radiation
• weather data and issues
• wind driven rain

1. Microclimate: field measurements, driving rain analyses  

1. Microclimate: field measurements, driving rain analyses
2. Prediction of driving rain intensities using potential flows