Long-term measurements of sound propagation in Finland, invited paper No. 326

The weather conditions can have an enormous effect on sound propagation outdoors. The environmental factors must be included in sound propagation models, but what are the most important factors and what is really needed to arrange a long-term sound propagation measurement adequate for scientific purposes? A short evaluation overview of outdoor sound propagation in Finland is given: we have just completed an extensive measurement campaign where dozens of meteorological factors along with sound factors were measured. Some of the atmospheric factors are statistically compared to the results from sound propagation measurements. The reliability and consistency of meteorological measures are considered.