Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 978 | 897 | 994 | 959 | 986 | 958 |
| Tmin | 978 | 897 | 990 | 958 | 986 | 957 |
| Duration of sunshine | 155 | 197 | 217 | 180 | 217 | 180 |
| Precipitation | 95 | 86 | 94 | 90 | 105 | 98 |
| Humidity/Visibility | 68 | 62 | 69 | 81 | 85 | 87 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 983 | 985 | 938 | 961 | 958 | 992 |
| Tmin | 983 | 984 | 939 | 961 | 958 | 989 |
| Duration of sunshine | 186 | 279 | 210 | 279 | 240 | 186 |
| Precipitation | 97 | 103 | 75 | 76 | 95 | 101 |
| Humidity/Visibility | 91 | 87 | 93 | 92 | 93 | 100 |
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. |
