Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 140 | 103 | 112 | 109 | 120 | 108 |
| Tmin | 150 | 113 | 120 | 117 | 123 | 113 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 156 | 142 | 156 | 151 | 155 | 150 |
| Humidity/Visibility | 148 | 135 | 152 | 144 | 152 | 148 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 120 | 144 | 139 | 140 | 142 | 123 |
| Tmin | 120 | 136 | 143 | 142 | 146 | 116 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 160 | 188 | 179 | 184 | 179 | 160 |
| Humidity/Visibility | 149 | 166 | 169 | 166 | 157 | 151 |
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. |
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