Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 332 | 303 | 337 | 334 | 364 | 356 |
| Tmin | 338 | 305 | 332 | 333 | 365 | 358 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 89 | 99 | 113 | 131 | 122 |
| Humidity/Visibility | 89 | 80 | 89 | 100 | 118 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 363 | 368 | 353 | 362 | 352 | 362 |
| Tmin | 360 | 363 | 351 | 362 | 351 | 369 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 136 | 133 | 130 | 124 | 130 | 126 |
| Humidity/Visibility | 120 | 117 | 114 | 113 | 111 | 121 |
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. |
