Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1262 | 1149 | 1255 | 1226 | 1261 | 1217 |
| Tmin | 1227 | 1121 | 1229 | 1191 | 1227 | 1196 |
| Duration of sunshine | 125 | 56 | 93 | 60 | 155 | 61 |
| Precipitation | 186 | 169 | 186 | 180 | 188 | 179 |
| Humidity/Visibility | 163 | 150 | 164 | 155 | 162 | 159 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1260 | 1267 | 1249 | 1294 | 1249 | 1267 |
| Tmin | 1229 | 1234 | 1224 | 1263 | 1222 | 1262 |
| Duration of sunshine | 155 | 156 | 120 | 93 | 30 | 155 |
| Precipitation | 187 | 189 | 210 | 215 | 212 | 192 |
| Humidity/Visibility | 162 | 163 | 188 | 190 | 185 | 184 |
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. |
