Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2187 | 1978 | 2191 | 2124 | 2177 | 2119 |
| Tmin | 2161 | 1961 | 2191 | 2125 | 2177 | 2119 |
| Duration of sunshine | 93 | 86 | 93 | 90 | 155 | 150 |
| Precipitation | 189 | 172 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 175 | 155 | 180 | 177 | 180 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2183 | 2181 | 2146 | 2215 | 2152 | 2228 |
| Tmin | 2190 | 2184 | 2152 | 2225 | 2158 | 2202 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 187 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 170 | 168 | 201 | 208 | 206 | 207 |
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. |
