Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 82 | 68 | 88 | 86 | 89 | 100 |
| Tmin | 82 | 74 | 88 | 78 | 77 | 92 |
| Duration of sunshine | 248 | 225 | 217 | 240 | 217 | 210 |
| Precipitation | 118 | 99 | 101 | 109 | 111 | 120 |
| Humidity/Visibility | 62 | 58 | 70 | 65 | 68 | 80 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 106 | 117 | 114 | 112 | 113 | 115 |
| Tmin | 106 | 115 | 110 | 109 | 103 | 115 |
| Duration of sunshine | 155 | 217 | 240 | 186 | 180 | 248 |
| Precipitation | 153 | 143 | 136 | 137 | 136 | 144 |
| Humidity/Visibility | 96 | 95 | 99 | 91 | 93 | 98 |
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. |
