Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 83 | 74 | 72 | 75 | 75 | 61 |
| Tmin | 78 | 72 | 66 | 73 | 70 | 61 |
| Duration of sunshine | 62 | 29 | 31 | 0 | 0 | 30 |
| Precipitation | 99 | 91 | 104 | 103 | 101 | 98 |
| Humidity/Visibility | 62 | 58 | 57 | 64 | 60 | 49 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 61 | 75 | 75 | 81 | 87 | 78 |
| Tmin | 59 | 72 | 68 | 92 | 102 | 77 |
| Duration of sunshine | 0 | 0 | 30 | 124 | 30 | 93 |
| Precipitation | 106 | 109 | 107 | 123 | 147 | 146 |
| Humidity/Visibility | 49 | 60 | 59 | 73 | 81 | 63 |
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. |
