Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1087 | 990 | 1094 | 1083 | 1127 | 1075 |
| Tmin | 1099 | 993 | 1106 | 1090 | 1129 | 1091 |
| Duration of sunshine | 41 | 47 | 58 | 83 | 97 | 85 |
| Precipitation | 663 | 595 | 672 | 682 | 694 | 660 |
| Humidity/Visibility | 86 | 76 | 85 | 95 | 95 | 91 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1107 | 1083 | 1053 | 1097 | 1061 | 1125 |
| Tmin | 1106 | 1085 | 1060 | 1104 | 1063 | 1135 |
| Duration of sunshine | 81 | 86 | 83 | 70 | 59 | 52 |
| Precipitation | 680 | 696 | 676 | 689 | 672 | 700 |
| Humidity/Visibility | 79 | 71 | 84 | 111 | 104 | 116 |
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. |
