Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2616 | 2366 | 2623 | 2541 | 2608 | 2545 |
| Tmin | 2618 | 2380 | 2632 | 2542 | 2611 | 2544 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 186 | 170 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 182 | 163 | 182 | 174 | 177 | 173 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2622 | 2624 | 2562 | 2655 | 2573 | 2658 |
| Tmin | 2628 | 2628 | 2571 | 2655 | 2579 | 2664 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 60 | 62 |
| Precipitation | 186 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 174 | 177 | 197 | 204 | 203 | 214 |
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. |
