Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2190 | 1982 | 2195 | 2121 | 2173 | 2116 |
| Tmin | 2196 | 1978 | 2198 | 2123 | 2180 | 2117 |
| Duration of sunshine | 93 | 86 | 93 | 60 | 124 | 150 |
| Precipitation | 157 | 141 | 156 | 151 | 155 | 150 |
| Humidity/Visibility | 152 | 138 | 153 | 148 | 153 | 147 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2189 | 2186 | 2121 | 2221 | 2152 | 2234 |
| Tmin | 2197 | 2187 | 2128 | 2223 | 2159 | 2234 |
| Duration of sunshine | 124 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 157 | 157 | 152 | 184 | 180 | 186 |
| Humidity/Visibility | 151 | 150 | 149 | 178 | 175 | 184 |
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. |
