Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 98 | 82 | 98 | 104 | 120 | 105 |
| Tmin | 94 | 84 | 97 | 101 | 123 | 109 |
| Duration of sunshine | 291 | 289 | 245 | 286 | 288 | 235 |
| Precipitation | 125 | 121 | 127 | 150 | 169 | 173 |
| Humidity/Visibility | 97 | 88 | 103 | 108 | 121 | 109 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 118 | 113 | 121 | 115 | 89 | 96 |
| Tmin | 112 | 106 | 111 | 114 | 79 | 97 |
| Duration of sunshine | 348 | 284 | 309 | 341 | 222 | 342 |
| Precipitation | 164 | 162 | 181 | 182 | 148 | 140 |
| Humidity/Visibility | 118 | 111 | 125 | 118 | 81 | 95 |
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. |
