Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 432 | 391 | 433 | 424 | 454 | 439 |
| Tmin | 427 | 382 | 426 | 427 | 449 | 430 |
| Duration of sunshine | 86 | 75 | 116 | 96 | 203 | 130 |
| Precipitation | 386 | 353 | 386 | 371 | 402 | 396 |
| Humidity/Visibility | 28 | 23 | 27 | 38 | 47 | 44 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 449 | 455 | 430 | 442 | 435 | 443 |
| Tmin | 437 | 448 | 418 | 436 | 431 | 431 |
| Duration of sunshine | 127 | 165 | 205 | 158 | 161 | 181 |
| Precipitation | 419 | 412 | 406 | 417 | 420 | 445 |
| Humidity/Visibility | 37 | 45 | 40 | 35 | 42 | 34 |
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. |
