Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 79 | 64 | 72 | 79 | 81 | 67 |
| Tmin | 87 | 74 | 78 | 79 | 84 | 84 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 156 | 135 | 171 | 169 | 176 | 154 |
| Humidity/Visibility | 120 | 112 | 117 | 108 | 112 | 120 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 75 | 72 | 72 | 82 | 79 | 78 |
| Tmin | 81 | 70 | 73 | 79 | 83 | 75 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 149 | 197 | 202 | 184 | 161 | 177 |
| Humidity/Visibility | 94 | 112 | 141 | 137 | 122 | 130 |
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. |
