Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1326 | 1202 | 1330 | 1284 | 1341 | 1314 |
| Tmin | 1331 | 1193 | 1319 | 1280 | 1336 | 1305 |
| Duration of sunshine | 93 | 29 | 62 | 60 | 93 | 90 |
| Precipitation | 65 | 57 | 66 | 63 | 79 | 94 |
| Humidity/Visibility | 59 | 56 | 57 | 55 | 72 | 85 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1357 | 1350 | 1305 | 1352 | 1313 | 1359 |
| Tmin | 1348 | 1352 | 1301 | 1340 | 1302 | 1343 |
| Duration of sunshine | 93 | 93 | 30 | 62 | 90 | 93 |
| Precipitation | 97 | 98 | 94 | 92 | 93 | 97 |
| Humidity/Visibility | 90 | 87 | 78 | 81 | 83 | 90 |
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. |
