Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 368 | 335 | 369 | 373 | 398 | 386 |
| Tmin | 336 | 304 | 336 | 342 | 367 | 351 |
| Duration of sunshine | 31 | 28 | 62 | 60 | 31 | 30 |
| Precipitation | 93 | 85 | 97 | 111 | 124 | 121 |
| Humidity/Visibility | 91 | 84 | 89 | 103 | 121 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 393 | 385 | 388 | 396 | 389 | 397 |
| Tmin | 365 | 353 | 359 | 364 | 358 | 370 |
| Duration of sunshine | 31 | 62 | 30 | 62 | 60 | 0 |
| Precipitation | 126 | 128 | 121 | 122 | 120 | 125 |
| Humidity/Visibility | 117 | 108 | 117 | 117 | 117 | 123 |
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. |
