Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1175 | 1087 | 1204 | 1185 | 1208 | 1196 |
| Tmin | 1177 | 1085 | 1199 | 1193 | 1202 | 1194 |
| Duration of sunshine | 217 | 226 | 248 | 240 | 279 | 240 |
| Precipitation | 128 | 111 | 125 | 146 | 155 | 151 |
| Humidity/Visibility | 119 | 109 | 122 | 142 | 152 | 147 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1235 | 1230 | 1175 | 1229 | 1195 | 1239 |
| Tmin | 1235 | 1238 | 1167 | 1228 | 1196 | 1231 |
| Duration of sunshine | 186 | 248 | 300 | 279 | 180 | 279 |
| Precipitation | 157 | 156 | 152 | 152 | 150 | 156 |
| Humidity/Visibility | 152 | 151 | 146 | 148 | 147 | 153 |
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. |
