Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1164 | 1062 | 1167 | 1162 | 1196 | 1167 |
| Tmin | 1166 | 1065 | 1171 | 1166 | 1197 | 1165 |
| Duration of sunshine | 248 | 225 | 217 | 240 | 310 | 270 |
| Precipitation | 104 | 87 | 96 | 129 | 131 | 123 |
| Humidity/Visibility | 87 | 82 | 84 | 114 | 117 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1202 | 1202 | 1158 | 1202 | 1167 | 1197 |
| Tmin | 1201 | 1206 | 1158 | 1203 | 1162 | 1205 |
| Duration of sunshine | 217 | 248 | 180 | 279 | 210 | 248 |
| Precipitation | 128 | 128 | 125 | 123 | 126 | 130 |
| Humidity/Visibility | 121 | 120 | 116 | 115 | 116 | 120 |
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. |
