Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1187 | 1093 | 1209 | 1184 | 1228 | 1199 |
| Tmin | 1188 | 1093 | 1209 | 1186 | 1228 | 1199 |
| Duration of sunshine | 217 | 198 | 248 | 180 | 279 | 240 |
| Precipitation | 589 | 535 | 591 | 589 | 620 | 600 |
| Humidity/Visibility | 92 | 83 | 92 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1237 | 1238 | 1184 | 1225 | 1198 | 1235 |
| Tmin | 1240 | 1240 | 1184 | 1226 | 1199 | 1240 |
| Duration of sunshine | 217 | 248 | 240 | 310 | 180 | 248 |
| Precipitation | 622 | 623 | 600 | 620 | 600 | 124 |
| Humidity/Visibility | 122 | 122 | 118 | 110 | 118 | 123 |
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. |
