Table 3.
Factor loadings for individual thermal and barometric variables in the first two principal components (PCs).
| Factor Loadings | Principal Component 1 | Principal Component 2 |
|---|---|---|
| Thermal parameters | ||
| Average daily air temperature | −0.985 | 0.081 |
| Maximum daily air temperature | −0.997 | 0.055 |
| Minimum daily air temperature | −0.916 | 0.130 |
| Interdiurnal air temperature change | −0.224 | −0.970 |
| The logarithm value of the daily air temperature amplitude * | −0.707 | −0.051 |
| Barometric parameters | ||
| Average daily atmospheric air pressure | −0.989 | −0.067 |
| Maximum daily atmospheric air pressure | −0.940 | −0.288 |
| Minimum daily atmospheric air pressure | −0.978 | 0.114 |
| Interdiurnal air-pressure change | −0.433 | −0.116 |
| The logarithm value of the daily amplitude of atmospheric air pressure * | 0.255 | −0.964 |
* parameters with skewed distributions were normalised by logarithmic transformation.