Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 335 | 306 | 334 | 336 | 368 | 358 |
| Tmin | 336 | 305 | 337 | 339 | 362 | 355 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 86 | 97 | 113 | 132 | 125 |
| Humidity/Visibility | 88 | 81 | 90 | 101 | 120 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 363 | 368 | 358 | 364 | 354 | 368 |
| Tmin | 358 | 367 | 356 | 364 | 352 | 368 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 127 | 122 | 128 | 123 | 128 |
| Humidity/Visibility | 121 | 118 | 117 | 115 | 112 | 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. |
