| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
2 minutes average wind speed (m/s) | 2.17 | 2.4 | 1.93 | 2 | 2.07 | 2 | 2.33 | 2.37 | 2.23 | 2.9 | 2.27 | 2.53 |
Average temperature (˚C) | 14.67 | 12.77 | 14.83 | 20.53 | 24.3 | 26.17 | 29.73 | 29.8 | 28.9 | 24.67 | 19.87 | 14.77 |
Relative humidity (%) | 74.33 | 72.33 | 78.67 | 74.67 | 78 | 89 | 74 | 76.67 | 73.67 | 64 | 70.67 | 60 |
Number of negative oxygen ions(pieces/cm3) | 1168 | 1134 | 1468 | 1569 | 1677 | 1892 | 2104 | 2219 | 2175 | 2051 | 1742 | 1195 |