Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 53 | 42 | 53 | 57 | 59 | 62 |
| Tmin | 52 | 50 | 58 | 59 | 57 | 71 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 60 | 62 | 62 | 67 | 73 |
| Humidity/Visibility | 49 | 43 | 51 | 51 | 54 | 60 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 84 | 74 | 78 | 84 | 70 | 81 |
| Tmin | 78 | 76 | 79 | 80 | 70 | 86 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 98 | 94 | 100 | 98 | 92 | 99 |
| Humidity/Visibility | 74 | 67 | 67 | 68 | 63 | 78 |
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. |
