Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1065 | 986 | 1131 | 1129 | 1167 | 1133 |
| Tmin | 1033 | 956 | 1076 | 1068 | 1106 | 1071 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 589 | 533 | 619 | 629 | 650 | 629 |
| Humidity/Visibility | 85 | 69 | 102 | 119 | 121 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1159 | 1155 | 1122 | 1150 | 1127 | 1105 |
| Tmin | 1105 | 1101 | 1067 | 1093 | 1096 | 1094 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 654 | 652 | 629 | 649 | 632 | 625 |
| Humidity/Visibility | 120 | 109 | 115 | 115 | 134 | 101 |
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. |
