Fig. 3From: Quantifying the role of weather on seasonal influenzaCorrelation circle of the principal component analysis (PCA) on climatic data. A: Average temperature, B: Average absolute humidity, C: Average relative humidity, D: Daily variation of relative humidity, E: Sunshine duration, F: Daily variation of absolute humidity. The PCA explains 85.47Â % of the variance with its first two axes explaining, respectively, 48.73 and 36.74Â %Back to article page