Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1204 | 1119 | 1239 | 1198 | 1235 | 1200 |
| Tmin | 1207 | 1121 | 1239 | 1198 | 1236 | 1197 |
| Duration of sunshine | 248 | 254 | 279 | 270 | 310 | 300 |
| Precipitation | 186 | 168 | 186 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 167 | 185 | 178 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1236 | 1238 | 1219 | 1260 | 1225 | 1270 |
| Tmin | 1238 | 1242 | 1220 | 1262 | 1228 | 1270 |
| Duration of sunshine | 310 | 310 | 300 | 310 | 256 | 310 |
| Precipitation | 186 | 190 | 212 | 214 | 210 | 218 |
| Humidity/Visibility | 184 | 185 | 206 | 209 | 206 | 212 |
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. |
