Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 848 | 751 | 836 | 814 | 821 | 800 |
| Tmin | 853 | 764 | 845 | 827 | 854 | 827 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 705 | 635 | 696 | 685 | 718 | 689 |
| Humidity/Visibility | 172 | 145 | 165 | 162 | 159 | 156 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 829 | 840 | 827 | 864 | 833 | 875 |
| Tmin | 844 | 855 | 862 | 885 | 844 | 881 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 710 | 706 | 719 | 735 | 717 | 735 |
| Humidity/Visibility | 162 | 164 | 193 | 196 | 182 | 201 |
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. |
Agalega Isl