Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 321 | 290 | 320 | 320 | 337 | 316 |
| Tmin | 321 | 295 | 324 | 323 | 341 | 327 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 94 | 87 | 95 | 112 | 124 | 122 |
| Humidity/Visibility | 91 | 83 | 91 | 102 | 122 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 327 | 326 | 324 | 349 | 351 | 360 |
| Tmin | 337 | 330 | 331 | 350 | 356 | 368 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 128 | 129 | 122 | 124 | 120 | 124 |
| Humidity/Visibility | 121 | 121 | 117 | 116 | 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. |
