Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1116 | 1005 | 1114 | 1077 | 1114 | 1093 |
| Tmin | 1116 | 1009 | 1115 | 1077 | 1116 | 1093 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 57 | 62 | 62 | 62 | 73 |
| Humidity/Visibility | 60 | 56 | 61 | 58 | 61 | 71 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1146 | 1146 | 1107 | 1142 | 1108 | 1144 |
| Tmin | 1143 | 1143 | 1108 | 1142 | 1107 | 1144 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 97 | 96 | 90 | 91 | 94 | 98 |
| Humidity/Visibility | 92 | 91 | 88 | 86 | 87 | 91 |
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. |
