Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1264 | 1147 | 1265 | 1226 | 1265 | 1224 |
| Tmin | 1229 | 1121 | 1234 | 1196 | 1239 | 1190 |
| Duration of sunshine | 62 | 57 | 124 | 60 | 124 | 90 |
| Precipitation | 186 | 169 | 186 | 180 | 187 | 176 |
| Humidity/Visibility | 161 | 146 | 159 | 152 | 160 | 150 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1263 | 1268 | 1252 | 1295 | 1259 | 1272 |
| Tmin | 1236 | 1240 | 1224 | 1259 | 1223 | 1262 |
| Duration of sunshine | 93 | 93 | 120 | 93 | 30 | 93 |
| Precipitation | 188 | 189 | 211 | 215 | 212 | 193 |
| Humidity/Visibility | 162 | 164 | 185 | 186 | 179 | 180 |
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. |
