Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1248 | 1124 | 1231 | 1190 | 1232 | 1198 |
| Tmin | 1250 | 1123 | 1230 | 1193 | 1237 | 1198 |
| Duration of sunshine | 179 | 137 | 146 | 141 | 138 | 129 |
| Precipitation | 186 | 168 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 164 | 181 | 177 | 183 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1230 | 1218 | 1186 | 1208 | 1167 | 1202 |
| Tmin | 1232 | 1216 | 1186 | 1206 | 1168 | 1209 |
| Duration of sunshine | 133 | 100 | 114 | 110 | 116 | 120 |
| Precipitation | 186 | 190 | 212 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 183 | 204 | 208 | 203 | 212 |
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. |
