Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2460 | 2267 | 2507 | 2451 | 2520 | 2454 |
| Tmin | 2482 | 2287 | 2534 | 2482 | 2555 | 2483 |
| Duration of sunshine | 124 | 113 | 155 | 60 | 124 | 150 |
| Precipitation | 130 | 113 | 126 | 147 | 156 | 157 |
| Humidity/Visibility | 119 | 109 | 122 | 141 | 153 | 146 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2537 | 2534 | 2456 | 2507 | 2454 | 2540 |
| Tmin | 2567 | 2568 | 2482 | 2536 | 2484 | 2564 |
| Duration of sunshine | 155 | 124 | 180 | 155 | 120 | 186 |
| Precipitation | 158 | 156 | 153 | 152 | 155 | 164 |
| Humidity/Visibility | 151 | 149 | 145 | 148 | 145 | 150 |
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. |
