Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1256 | 1149 | 1260 | 1228 | 1257 | 1220 |
| Tmin | 1246 | 1150 | 1240 | 1195 | 1233 | 1195 |
| Duration of sunshine | 279 | 198 | 186 | 270 | 310 | 270 |
| Precipitation | 185 | 170 | 187 | 180 | 186 | 180 |
| Humidity/Visibility | 162 | 146 | 162 | 154 | 161 | 153 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1261 | 1266 | 1244 | 1290 | 1254 | 1270 |
| Tmin | 1237 | 1237 | 1214 | 1258 | 1220 | 1267 |
| Duration of sunshine | 310 | 279 | 270 | 248 | 240 | 279 |
| Precipitation | 188 | 189 | 210 | 211 | 210 | 192 |
| Humidity/Visibility | 161 | 165 | 185 | 180 | 182 | 178 |
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. |
