Anthropogenic load, changes in physical and climatic factors result in degradation of sanitary and technical systems for wastewater sludge treatment in drying beds. An increase in precipitation, neglected in design of drying beds, results in an additional load manifesting in flushing of loaded and piled wastewater sludge, drainage clogging in drying beds and, as a consequence, their complete performance loss. Arrays of meteorological stations located in the territory of the Russian Federation are analyzed. Proposed algorithms for calculating the climatic coefficient µ during the effective periods of regulations are assessed in terms of their adequacy and compared. Dynamics of climate changes, i.e. changes in air temperature and precipitation amount in the territory of the Russian Federation, shows that the previously introduced regulations related to determination of the climatic coefficient µ are not adequate and should be revised. In the previous 50 years, designs of drying beds might have errors in terms of territory gradation according to climatic characteristics (coefficient µ), which resulted in a significant decrease in operation and efficiency of drying beds and could cause their cluttering and eventually lead to their transformation into objects of accumulated environmental damage.