Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 32 | 52 | 53 | 64 | 81 | 78 |
| Tmin | 2 | 6 | 0 | 5 | 3 | 6 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 69 | 63 | 66 | 82 | 100 | 96 |
| Humidity/Visibility | 34 | 51 | 53 | 66 | 80 | 80 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 66 | 50 | 50 | 52 | 53 | 54 |
| Tmin | 2 | 4 | 1 | 0 | 0 | 0 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 108 | 110 | 98 | 96 | 115 | 125 |
| Humidity/Visibility | 71 | 67 | 79 | 72 | 71 | 66 |
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. |
