Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 372 | 336 | 372 | 360 | 372 | 360 |
| Tmin | 372 | 336 | 372 | 360 | 372 | 360 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 72 | 74 | 83 | 94 | 107 | 121 |
| Humidity/Visibility | 29 | 25 | 46 | 80 | 100 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 372 | 372 | 364 | 403 | 388 | 402 |
| Tmin | 372 | 372 | 363 | 403 | 389 | 403 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 118 | 106 | 117 | 94 | 121 | 98 |
| Humidity/Visibility | 95 | 98 | 116 | 54 | 28 | 59 |
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. |
