Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 77 | 70 | 70 | 71 | 72 | 88 |
| Tmin | 86 | 72 | 82 | 83 | 88 | 91 |
| Duration of sunshine | 78 | 67 | 72 | 70 | 73 | 76 |
| Precipitation | 112 | 109 | 108 | 106 | 103 | 117 |
| Humidity/Visibility | 58 | 52 | 59 | 58 | 61 | 68 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 91 | 101 | 94 | 109 | 90 | 98 |
| Tmin | 100 | 105 | 112 | 112 | 102 | 116 |
| Duration of sunshine | 65 | 101 | 92 | 111 | 89 | 98 |
| Precipitation | 137 | 145 | 130 | 131 | 132 | 138 |
| Humidity/Visibility | 70 | 77 | 78 | 80 | 73 | 81 |
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. |
