Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1225 | 1108 | 1223 | 1183 | 1225 | 1180 |
| Tmin | 1214 | 1098 | 1197 | 1148 | 1191 | 1152 |
| Duration of sunshine | 124 | 141 | 186 | 180 | 93 | 150 |
| Precipitation | 185 | 169 | 187 | 180 | 186 | 179 |
| Humidity/Visibility | 157 | 140 | 159 | 154 | 157 | 150 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1215 | 1220 | 1185 | 1234 | 1205 | 1221 |
| Tmin | 1189 | 1189 | 1151 | 1206 | 1176 | 1220 |
| Duration of sunshine | 155 | 157 | 130 | 124 | 90 | 124 |
| Precipitation | 187 | 189 | 211 | 215 | 212 | 192 |
| Humidity/Visibility | 158 | 161 | 179 | 183 | 171 | 170 |
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. |
