Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1041 | 930 | 1046 | 1039 | 1070 | 1073 |
| Tmin | 1045 | 932 | 1047 | 1040 | 1074 | 1062 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 561 | 516 | 564 | 581 | 596 | 588 |
| Humidity/Visibility | 58 | 47 | 56 | 80 | 83 | 102 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1099 | 1105 | 1059 | 1097 | 1068 | 1101 |
| Tmin | 1106 | 1105 | 1068 | 1098 | 1068 | 1102 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 594 | 600 | 572 | 589 | 580 | 139 |
| Humidity/Visibility | 103 | 108 | 103 | 101 | 98 | 106 |
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. |
