Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1064 | 982 | 1082 | 1048 | 1082 | 1061 |
| Tmin | 1063 | 982 | 1084 | 1049 | 1080 | 1056 |
| Duration of sunshine | 248 | 198 | 279 | 210 | 279 | 300 |
| Precipitation | 558 | 505 | 559 | 542 | 555 | 553 |
| Humidity/Visibility | 92 | 84 | 91 | 88 | 91 | 101 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1111 | 1108 | 1068 | 1099 | 1074 | 1114 |
| Tmin | 1108 | 1109 | 1068 | 1097 | 1077 | 1113 |
| Duration of sunshine | 279 | 310 | 210 | 248 | 180 | 279 |
| Precipitation | 590 | 591 | 571 | 586 | 572 | 590 |
| Humidity/Visibility | 119 | 121 | 117 | 117 | 118 | 123 |
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. |
