Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 115 | 105 | 109 | 106 | 109 | 110 |
| Tmin | 4 | 1 | 2 | 2 | 0 | 7 |
| Duration of sunshine | 93 | 141 | 93 | 150 | 124 | 90 |
| Precipitation | 125 | 118 | 124 | 125 | 123 | 120 |
| Humidity/Visibility | 113 | 101 | 112 | 98 | 108 | 105 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 108 | 105 | 111 | 110 | 108 | 111 |
| Tmin | 12 | 8 | 3 | 2 | 0 | 3 |
| Duration of sunshine | 124 | 155 | 150 | 155 | 120 | 155 |
| Precipitation | 130 | 134 | 123 | 123 | 131 | 128 |
| Humidity/Visibility | 110 | 108 | 109 | 106 | 103 | 113 |
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. |
