Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 103 | 86 | 108 | 129 | 136 | 120 |
| Tmin | 109 | 100 | 111 | 125 | 140 | 134 |
| Duration of sunshine | 108 | 89 | 103 | 127 | 134 | 133 |
| Precipitation | 136 | 120 | 126 | 155 | 159 | 152 |
| Humidity/Visibility | 111 | 99 | 112 | 131 | 140 | 136 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 125 | 134 | 138 | 125 | 117 | 114 |
| Tmin | 134 | 132 | 142 | 127 | 110 | 115 |
| Duration of sunshine | 122 | 133 | 132 | 127 | 106 | 114 |
| Precipitation | 156 | 161 | 153 | 154 | 126 | 128 |
| Humidity/Visibility | 136 | 131 | 139 | 132 | 111 | 121 |
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. |
Béja