Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 361 | 290 | 331 | 376 | 383 | 371 |
| Tmin | 370 | 298 | 331 | 374 | 384 | 378 |
| Duration of sunshine | 186 | 141 | 155 | 180 | 124 | 150 |
| Precipitation | 103 | 92 | 99 | 127 | 131 | 135 |
| Humidity/Visibility | 55 | 12 | 21 | 91 | 94 | 101 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 386 | 364 | 353 | 367 | 354 | 357 |
| Tmin | 383 | 367 | 356 | 363 | 350 | 359 |
| Duration of sunshine | 217 | 217 | 210 | 217 | 180 | 217 |
| Precipitation | 144 | 129 | 128 | 136 | 134 | 137 |
| Humidity/Visibility | 101 | 76 | 77 | 76 | 70 | 49 |
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. |
