Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 89 | 84 | 88 | 61 | 85 | 85 |
| Tmin | 86 | 70 | 85 | 72 | 93 | 94 |
| Duration of sunshine | 93 | 113 | 124 | 120 | 124 | 120 |
| Precipitation | 171 | 148 | 164 | 162 | 163 | 162 |
| Humidity/Visibility | 131 | 119 | 134 | 116 | 127 | 128 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 109 | 111 | 108 | 115 | 92 | 95 |
| Tmin | 112 | 123 | 101 | 104 | 93 | 90 |
| Duration of sunshine | 62 | 124 | 120 | 124 | 90 | 124 |
| Precipitation | 164 | 193 | 187 | 181 | 151 | 166 |
| Humidity/Visibility | 135 | 144 | 154 | 149 | 128 | 137 |
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. |
