Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 715 | 644 | 731 | 718 | 742 | 715 |
| Tmin | 726 | 660 | 750 | 725 | 753 | 723 |
| Duration of sunshine | 163 | 299 | 330 | 170 | 279 | 215 |
| Precipitation | 155 | 147 | 168 | 154 | 164 | 146 |
| Humidity/Visibility | 112 | 100 | 126 | 124 | 135 | 129 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 732 | 757 | 730 | 737 | 703 | 730 |
| Tmin | 743 | 753 | 746 | 751 | 710 | 746 |
| Duration of sunshine | 341 | 345 | 309 | 300 | 291 | 247 |
| Precipitation | 154 | 177 | 181 | 166 | 163 | 158 |
| Humidity/Visibility | 127 | 138 | 139 | 129 | 111 | 136 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
Mahe