Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1129 | 1033 | 1141 | 1103 | 1143 | 1110 |
| Tmin | 1130 | 1037 | 1147 | 1105 | 1145 | 1104 |
| Duration of sunshine | 415 | 379 | 422 | 407 | 423 | 414 |
| Precipitation | 652 | 591 | 654 | 631 | 651 | 632 |
| Humidity/Visibility | 184 | 166 | 183 | 178 | 184 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1143 | 1146 | 1135 | 1166 | 1134 | 1170 |
| Tmin | 1144 | 1146 | 1137 | 1170 | 1136 | 1175 |
| Duration of sunshine | 456 | 461 | 451 | 501 | 404 | 483 |
| Precipitation | 651 | 655 | 662 | 680 | 662 | 219 |
| Humidity/Visibility | 183 | 185 | 206 | 210 | 207 | 215 |
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. |
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