Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2076 | 56 | 62 | 73 | 92 | 89 |
| Tmin | 2077 | 57 | 61 | 74 | 93 | 89 |
| Duration of sunshine | 217 | 226 | 279 | 270 | 310 | 270 |
| Precipitation | 62 | 57 | 63 | 76 | 93 | 92 |
| Humidity/Visibility | 61 | 56 | 61 | 74 | 91 | 88 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 93 | 91 | 88 | 88 | 86 | 93 |
| Tmin | 87 | 91 | 87 | 88 | 88 | 93 |
| Duration of sunshine | 248 | 310 | 300 | 279 | 210 | 279 |
| Precipitation | 98 | 94 | 90 | 90 | 91 | 94 |
| Humidity/Visibility | 91 | 91 | 88 | 86 | 88 | 92 |
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. |
