Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 184 | 156 | 148 | 147 | 150 | 149 |
| Tmin | 171 | 155 | 149 | 144 | 148 | 147 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 186 | 162 | 186 | 181 | 186 | 180 |
| Humidity/Visibility | 127 | 109 | 106 | 101 | 107 | 103 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 176 | 179 | 188 | 181 | 161 | 152 |
| Tmin | 178 | 181 | 192 | 181 | 173 | 161 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 188 | 191 | 216 | 214 | 190 | 191 |
| Humidity/Visibility | 122 | 122 | 131 | 125 | 116 | 113 |
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. |
