Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 180 | 166 | 213 | 234 | 232 | 233 |
| Tmin | 205 | 183 | 219 | 225 | 230 | 222 |
| Duration of sunshine | 83 | 68 | 97 | 113 | 110 | 105 |
| Precipitation | 152 | 138 | 178 | 172 | 180 | 174 |
| Humidity/Visibility | 74 | 67 | 90 | 97 | 98 | 95 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 232 | 235 | 231 | 219 | 191 | 185 |
| Tmin | 243 | 238 | 252 | 231 | 253 | 263 |
| Duration of sunshine | 115 | 117 | 112 | 98 | 115 | 141 |
| Precipitation | 186 | 188 | 203 | 178 | 205 | 184 |
| Humidity/Visibility | 97 | 99 | 102 | 83 | 95 | 87 |
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. |
