Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 45 | 39 | 54 | 54 | 61 | 63 |
| Tmin | 55 | 53 | 59 | 58 | 61 | 68 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 93 | 91 | 95 | 91 | 97 | 106 |
| Humidity/Visibility | 41 | 36 | 44 | 43 | 44 | 50 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 72 | 82 | 78 | 75 | 73 | 80 |
| Tmin | 80 | 90 | 88 | 83 | 81 | 90 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 131 | 121 | 123 | 126 | 124 |
| Humidity/Visibility | 59 | 65 | 62 | 58 | 58 | 65 |
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. |
