Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 334 | 301 | 332 | 355 | 365 | 352 |
| Tmin | 338 | 303 | 335 | 351 | 365 | 352 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 99 | 93 | 98 | 132 | 126 | 127 |
| Humidity/Visibility | 73 | 67 | 72 | 97 | 100 | 97 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 357 | 368 | 351 | 364 | 344 | 361 |
| Tmin | 363 | 367 | 350 | 367 | 341 | 367 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 131 | 130 | 132 | 123 | 130 | 139 |
| Humidity/Visibility | 91 | 96 | 90 | 92 | 85 | 92 |
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. |
