Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1125 | 1034 | 1138 | 1103 | 1129 | 1102 |
| Tmin | 1094 | 1004 | 1113 | 1074 | 1104 | 1075 |
| Duration of sunshine | 93 | 141 | 155 | 150 | 155 | 150 |
| Precipitation | 713 | 645 | 714 | 691 | 713 | 690 |
| Humidity/Visibility | 174 | 158 | 174 | 168 | 172 | 166 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1136 | 1132 | 1124 | 1163 | 1130 | 1143 |
| Tmin | 1111 | 1115 | 1099 | 1139 | 1103 | 1136 |
| Duration of sunshine | 155 | 155 | 150 | 156 | 150 | 155 |
| Precipitation | 715 | 717 | 720 | 741 | 720 | 718 |
| Humidity/Visibility | 172 | 174 | 196 | 197 | 193 | 185 |
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. |
