Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1185 | 1080 | 1189 | 1154 | 1172 | 1116 |
| Tmin | 1187 | 1080 | 1188 | 1155 | 1174 | 1115 |
| Duration of sunshine | 124 | 141 | 124 | 120 | 155 | 150 |
| Precipitation | 186 | 164 | 185 | 181 | 174 | 147 |
| Humidity/Visibility | 181 | 152 | 182 | 177 | 167 | 143 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1181 | 1203 | 1189 | 1228 | 1180 | 1233 |
| Tmin | 1182 | 1204 | 1189 | 1229 | 1181 | 1232 |
| Duration of sunshine | 124 | 155 | 150 | 155 | 120 | 124 |
| Precipitation | 177 | 191 | 209 | 216 | 219 | 223 |
| Humidity/Visibility | 168 | 178 | 200 | 206 | 187 | 205 |
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. |
