Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 958 | 909 | 1010 | 982 | 1016 | 968 |
| Tmin | 966 | 922 | 1020 | 985 | 1016 | 982 |
| Duration of sunshine | 371 | 305 | 337 | 356 | 400 | 382 |
| Precipitation | 99 | 88 | 111 | 107 | 101 | 90 |
| Humidity/Visibility | 90 | 81 | 83 | 73 | 70 | 82 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1010 | 1009 | 965 | 1032 | 1005 | 1045 |
| Tmin | 1013 | 1011 | 960 | 1029 | 1007 | 1044 |
| Duration of sunshine | 393 | 392 | 387 | 386 | 407 | 424 |
| Precipitation | 95 | 99 | 116 | 130 | 136 | 139 |
| Humidity/Visibility | 55 | 52 | 87 | 115 | 107 | 119 |
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. |
