Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1333 | 1204 | 1333 | 1290 | 1333 | 1290 |
| Tmin | 1333 | 1204 | 1333 | 1290 | 1333 | 1290 |
| Duration of sunshine | 217 | 226 | 155 | 210 | 217 | 180 |
| Precipitation | 35 | 34 | 39 | 33 | 34 | 35 |
| Humidity/Visibility | 29 | 26 | 28 | 29 | 33 | 33 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1333 | 1333 | 1290 | 1333 | 1290 | 1333 |
| Tmin | 1333 | 1333 | 1290 | 1333 | 1290 | 1333 |
| Duration of sunshine | 248 | 217 | 240 | 248 | 210 | 217 |
| Precipitation | 34 | 37 | 39 | 34 | 38 | 56 |
| Humidity/Visibility | 32 | 30 | 30 | 29 | 57 | 45 |
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. |
