Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1263 | 1140 | 1264 | 1217 | 1245 | 1218 |
| Tmin | 1239 | 1123 | 1247 | 1204 | 1229 | 1203 |
| Duration of sunshine | 186 | 197 | 217 | 180 | 155 | 120 |
| Precipitation | 187 | 165 | 186 | 181 | 185 | 179 |
| Humidity/Visibility | 157 | 141 | 164 | 158 | 156 | 156 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1258 | 1255 | 1239 | 1272 | 1244 | 1261 |
| Tmin | 1242 | 1235 | 1216 | 1266 | 1234 | 1266 |
| Duration of sunshine | 248 | 248 | 240 | 279 | 150 | 155 |
| Precipitation | 189 | 190 | 208 | 213 | 208 | 214 |
| Humidity/Visibility | 160 | 163 | 160 | 180 | 170 | 179 |
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. |
