Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 161 | 158 | 167 | 159 | 169 | 159 |
| Tmin | 129 | 128 | 135 | 134 | 135 | 136 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 198 | 180 | 206 | 192 | 210 | 187 |
| Humidity/Visibility | 116 | 108 | 116 | 109 | 113 | 112 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 165 | 163 | 199 | 187 | 161 | 176 |
| Tmin | 129 | 136 | 168 | 156 | 156 | 175 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 204 | 203 | 225 | 238 | 209 | 203 |
| Humidity/Visibility | 114 | 118 | 139 | 130 | 118 | 133 |
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. |
