Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 786 | 708 | 790 | 749 | 760 | 729 |
| Tmin | 790 | 720 | 786 | 755 | 758 | 730 |
| Duration of sunshine | 62 | 169 | 279 | 180 | 186 | 150 |
| Precipitation | 168 | 148 | 159 | 153 | 160 | 154 |
| Humidity/Visibility | 145 | 132 | 144 | 138 | 144 | 137 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 731 | 693 | 656 | 680 | 659 | 680 |
| Tmin | 736 | 689 | 655 | 680 | 656 | 681 |
| Duration of sunshine | 124 | 124 | 120 | 155 | 90 | 155 |
| Precipitation | 156 | 153 | 158 | 159 | 156 | 161 |
| Humidity/Visibility | 139 | 137 | 138 | 132 | 135 | 144 |
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. |
Dagoretti