Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1433 | 1306 | 1443 | 1397 | 1428 | 1396 |
| Tmin | 1440 | 1310 | 1446 | 1397 | 1425 | 1401 |
| Duration of sunshine | 155 | 142 | 155 | 150 | 186 | 180 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 181 | 162 | 177 | 171 | 174 | 172 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1440 | 1446 | 1413 | 1470 | 1428 | 1483 |
| Tmin | 1450 | 1447 | 1418 | 1478 | 1435 | 1482 |
| Duration of sunshine | 186 | 186 | 180 | 186 | 120 | 155 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 172 | 176 | 193 | 202 | 200 | 214 |
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. |
