Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 121 | 110 | 120 | 143 | 145 | 115 |
| Tmin | 120 | 104 | 122 | 144 | 141 | 114 |
| Duration of sunshine | 113 | 104 | 115 | 137 | 131 | 108 |
| Precipitation | 126 | 116 | 130 | 154 | 159 | 162 |
| Humidity/Visibility | 120 | 109 | 120 | 143 | 146 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 88 | 60 | 60 | 61 | 57 | 60 |
| Tmin | 90 | 61 | 57 | 60 | 56 | 60 |
| Duration of sunshine | 84 | 63 | 54 | 59 | 54 | 60 |
| Precipitation | 161 | 177 | 166 | 163 | 166 | 173 |
| Humidity/Visibility | 149 | 143 | 137 | 141 | 140 | 147 |
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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