Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 58 | 56 | 60 | 70 | 90 | 79 |
| Tmin | 0 | 0 | 0 | 2 | 0 | 0 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 63 | 58 | 62 | 82 | 94 | 92 |
| Humidity/Visibility | 59 | 55 | 60 | 72 | 87 | 84 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 89 | 83 | 77 | 76 | 69 | 79 |
| Tmin | 1 | 6 | 5 | 1 | 0 | 0 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 100 | 99 | 102 | 103 | 92 | 104 |
| Humidity/Visibility | 89 | 85 | 72 | 70 | 70 | 75 |
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. |
