Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1158 | 1041 | 1155 | 1129 | 1167 | 1140 |
| Tmin | 1159 | 1054 | 1171 | 1152 | 1189 | 1152 |
| Duration of sunshine | 232 | 177 | 261 | 207 | 246 | 213 |
| Precipitation | 117 | 103 | 127 | 157 | 149 | 139 |
| Humidity/Visibility | 82 | 67 | 80 | 91 | 94 | 98 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1182 | 1181 | 1140 | 1169 | 1146 | 1175 |
| Tmin | 1182 | 1185 | 1139 | 1174 | 1143 | 1190 |
| Duration of sunshine | 213 | 208 | 225 | 288 | 284 | 220 |
| Precipitation | 147 | 146 | 143 | 148 | 150 | 163 |
| Humidity/Visibility | 96 | 96 | 96 | 84 | 89 | 92 |
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. |
