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Table 2 The main characteristics of the weather type clusters defined for Ioannina prefecture (1995–99).

From: Weather conditions and Bell's palsy: five-year study and review of the literature

  Weather type
Cluster 1 Humidity (relative and absolute) decrease Mostly during the cold period of the year
Cluster 2 Temperature decrease  
Cluster 3 Absolute humidity and minimum temperature decrease  
Cluster 4 Domination of a low pressure system  
Cluster 5 Domination of a high pressure system  
Cluster 6 Persistence of warm and dry weather Mostly during the warm period of the year
Cluster 7 High temperature, humidity (relative and absolute) increase  
Cluster 8 Humidity (relative and absolute) decrease