Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1072 | 980 | 1077 | 1045 | 1080 | 1044 |
| Tmin | 1071 | 978 | 1073 | 1049 | 1082 | 1046 |
| Duration of sunshine | 62 | 57 | 93 | 120 | 124 | 60 |
| Precipitation | 161 | 145 | 161 | 158 | 156 | 151 |
| Humidity/Visibility | 131 | 121 | 128 | 124 | 132 | 130 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1077 | 1083 | 1077 | 1110 | 1079 | 1110 |
| Tmin | 1079 | 1083 | 1077 | 1108 | 1069 | 1110 |
| Duration of sunshine | 124 | 93 | 120 | 62 | 30 | 62 |
| Precipitation | 161 | 163 | 182 | 187 | 187 | 198 |
| Humidity/Visibility | 136 | 139 | 162 | 153 | 151 | 168 |
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. |
