Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 524 | 474 | 527 | 508 | 526 | 506 |
| Tmin | 526 | 473 | 526 | 508 | 527 | 506 |
| Duration of sunshine | 31 | 26 | 31 | 30 | 31 | 46 |
| Precipitation | 186 | 168 | 186 | 182 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 185 | 179 | 185 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 525 | 525 | 538 | 548 | 536 | 555 |
| Tmin | 526 | 528 | 538 | 550 | 538 | 553 |
| Duration of sunshine | 62 | 58 | 59 | 60 | 60 | 58 |
| Precipitation | 186 | 190 | 212 | 215 | 210 | 219 |
| Humidity/Visibility | 184 | 185 | 207 | 210 | 207 | 212 |
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. |
