Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1350 | 1218 | 1344 | 1296 | 1326 | 1292 |
| Tmin | 1213 | 1096 | 1210 | 1177 | 1214 | 1172 |
| Duration of sunshine | 93 | 113 | 93 | 60 | 93 | 120 |
| Precipitation | 128 | 121 | 129 | 131 | 117 | 133 |
| Humidity/Visibility | 95 | 93 | 92 | 81 | 78 | 82 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1342 | 1327 | 1289 | 1340 | 1304 | 1344 |
| Tmin | 1216 | 1210 | 1176 | 1211 | 1170 | 1211 |
| Duration of sunshine | 124 | 124 | 150 | 155 | 120 | 155 |
| Precipitation | 143 | 134 | 137 | 129 | 129 | 143 |
| Humidity/Visibility | 83 | 81 | 78 | 87 | 92 | 90 |
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. |
