Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1152 | 1064 | 1175 | 1149 | 1189 | 1168 |
| Tmin | 1155 | 1065 | 1177 | 1155 | 1196 | 1166 |
| Duration of sunshine | 210 | 163 | 239 | 239 | 294 | 262 |
| Precipitation | 95 | 86 | 94 | 108 | 126 | 122 |
| Humidity/Visibility | 89 | 83 | 90 | 101 | 119 | 118 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1207 | 1202 | 1151 | 1202 | 1166 | 1204 |
| Tmin | 1205 | 1209 | 1156 | 1203 | 1167 | 1209 |
| Duration of sunshine | 238 | 236 | 230 | 237 | 224 | 261 |
| Precipitation | 124 | 125 | 121 | 121 | 124 | 126 |
| Humidity/Visibility | 122 | 121 | 115 | 116 | 115 | 121 |
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. |
