Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 492 | 446 | 494 | 476 | 494 | 478 |
| Tmin | 496 | 446 | 494 | 478 | 493 | 478 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 155 | 145 | 157 | 153 | 161 | 150 |
| Humidity/Visibility | 152 | 139 | 153 | 148 | 152 | 147 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 489 | 493 | 507 | 512 | 506 | 526 |
| Tmin | 492 | 496 | 507 | 520 | 505 | 523 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 159 | 159 | 180 | 184 | 182 | 187 |
| Humidity/Visibility | 152 | 153 | 174 | 176 | 176 | 180 |
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. |
