Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 91 | 83 | 91 | 101 | 123 | 116 |
| Tmin | 93 | 83 | 92 | 101 | 124 | 119 |
| Duration of sunshine | 244 | 251 | 308 | 340 | 371 | 326 |
| Precipitation | 94 | 86 | 95 | 110 | 124 | 122 |
| Humidity/Visibility | 84 | 77 | 91 | 102 | 122 | 111 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 121 | 120 | 119 | 117 | 119 | 122 |
| Tmin | 121 | 123 | 119 | 119 | 117 | 123 |
| Duration of sunshine | 338 | 362 | 360 | 362 | 293 | 335 |
| Precipitation | 128 | 126 | 120 | 122 | 120 | 125 |
| Humidity/Visibility | 107 | 112 | 111 | 114 | 103 | 115 |
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. |
