Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1045 | 976 | 1070 | 1061 | 1089 | 1060 |
| Tmin | 1047 | 972 | 1065 | 1064 | 1094 | 1055 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 143 | 122 | 144 | 162 | 164 | 163 |
| Humidity/Visibility | 113 | 106 | 111 | 138 | 140 | 135 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1095 | 1083 | 1060 | 1087 | 1043 | 1096 |
| Tmin | 1105 | 1098 | 1058 | 1082 | 1045 | 1092 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 163 | 172 | 170 | 172 | 160 | 175 |
| Humidity/Visibility | 139 | 137 | 132 | 129 | 131 | 141 |
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