Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2152 | 1944 | 2157 | 2082 | 2142 | 2084 |
| Tmin | 2156 | 1955 | 2164 | 2092 | 2144 | 2086 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 186 | 169 | 187 | 182 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 183 | 176 | 180 | 175 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2151 | 2159 | 2118 | 2187 | 2120 | 2184 |
| Tmin | 2163 | 2162 | 2125 | 2192 | 2124 | 2183 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 62 |
| Precipitation | 187 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 177 | 181 | 200 | 206 | 204 | 215 |
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. |
