Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1013 | 945 | 1057 | 1072 | 1111 | 1067 |
| Tmin | 1073 | 982 | 1073 | 1071 | 1115 | 1068 |
| Duration of sunshine | 117 | 218 | 257 | 324 | 267 | 292 |
| Precipitation | 102 | 88 | 96 | 125 | 125 | 123 |
| Humidity/Visibility | 60 | 64 | 80 | 116 | 121 | 115 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1102 | 1105 | 1060 | 1088 | 1024 | 1041 |
| Tmin | 1106 | 1101 | 1060 | 1091 | 1023 | 1073 |
| Duration of sunshine | 327 | 389 | 378 | 314 | 234 | 240 |
| Precipitation | 127 | 128 | 125 | 113 | 125 | 126 |
| Humidity/Visibility | 120 | 119 | 116 | 101 | 64 | 68 |
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. |
