Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1128 | 1022 | 1134 | 1096 | 1127 | 1094 |
| Tmin | 1127 | 1030 | 1126 | 1087 | 1124 | 1089 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 135 | 122 | 139 | 138 | 136 | 135 |
| Humidity/Visibility | 114 | 99 | 113 | 113 | 107 | 110 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1127 | 1156 | 1131 | 1153 | 1131 | 1161 |
| Tmin | 1124 | 1147 | 1119 | 1141 | 1124 | 1154 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 139 | 173 | 164 | 175 | 167 | 177 |
| Humidity/Visibility | 113 | 139 | 137 | 131 | 138 | 139 |
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. |
