Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 900 | 813 | 900 | 870 | 900 | 872 |
| Tmin | 1396 | 1260 | 1395 | 1350 | 1395 | 1350 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 66 | 62 | 61 | 77 | 94 | 91 |
| Humidity/Visibility | 59 | 55 | 59 | 72 | 88 | 87 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 900 | 899 | 870 | 899 | 870 | 904 |
| Tmin | 1395 | 1395 | 1350 | 1395 | 1350 | 1400 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 95 | 89 | 92 | 90 | 96 |
| Humidity/Visibility | 87 | 88 | 85 | 79 | 82 | 83 |
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. |
