Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1059 | 969 | 1068 | 1058 | 1090 | 1063 |
| Tmin | 1062 | 974 | 1073 | 1055 | 1100 | 1061 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 114 | 101 | 107 | 140 | 135 | 123 |
| Humidity/Visibility | 82 | 76 | 83 | 100 | 110 | 104 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1099 | 1094 | 1057 | 1079 | 1026 | 1097 |
| Tmin | 1099 | 1103 | 1065 | 1087 | 1027 | 1102 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 130 | 128 | 129 | 122 | 132 | 133 |
| Humidity/Visibility | 109 | 115 | 109 | 108 | 101 | 112 |
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. |
