Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 339 | 305 | 340 | 339 | 366 | 356 |
| Tmin | 333 | 304 | 336 | 343 | 366 | 351 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 85 | 95 | 111 | 124 | 122 |
| Humidity/Visibility | 91 | 83 | 91 | 103 | 122 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 345 | 342 | 332 | 363 | 357 | 366 |
| Tmin | 357 | 342 | 333 | 362 | 356 | 369 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 127 | 120 | 122 | 124 | 124 |
| Humidity/Visibility | 122 | 121 | 115 | 116 | 117 | 124 |
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. |
