Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1076 | 982 | 1086 | 1065 | 1109 | 1083 |
| Tmin | 1076 | 983 | 1085 | 1062 | 1112 | 1087 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 690 | 624 | 692 | 697 | 721 | 692 |
| Humidity/Visibility | 120 | 108 | 119 | 126 | 147 | 144 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1140 | 1145 | 1108 | 1132 | 1106 | 1144 |
| Tmin | 1142 | 1145 | 1106 | 1130 | 1105 | 1140 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 715 | 715 | 694 | 719 | 700 | 159 |
| Humidity/Visibility | 153 | 148 | 144 | 145 | 139 | 150 |
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. |
