Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1016 | 926 | 1016 | 986 | 1022 | 987 |
| Tmin | 1047 | 950 | 1043 | 1015 | 1040 | 1011 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 140 | 120 | 123 | 125 | 129 | 125 |
| Humidity/Visibility | 96 | 68 | 73 | 75 | 94 | 99 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1027 | 1033 | 1002 | 1035 | 1003 | 1027 |
| Tmin | 1047 | 1057 | 1029 | 1062 | 1024 | 1039 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 142 | 151 | 146 | 149 | 148 | 124 |
| Humidity/Visibility | 108 | 112 | 110 | 114 | 104 | 99 |
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. |
