Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1039 | 957 | 1062 | 1028 | 1059 | 1031 |
| Tmin | 1038 | 960 | 1065 | 1035 | 1068 | 1038 |
| Duration of sunshine | 186 | 198 | 155 | 210 | 217 | 240 |
| Precipitation | 93 | 85 | 95 | 109 | 124 | 120 |
| Humidity/Visibility | 92 | 83 | 91 | 104 | 122 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1066 | 1056 | 1018 | 1081 | 1049 | 1085 |
| Tmin | 1075 | 1061 | 1025 | 1085 | 1052 | 1088 |
| Duration of sunshine | 248 | 124 | 240 | 155 | 210 | 155 |
| Precipitation | 126 | 127 | 120 | 122 | 120 | 124 |
| Humidity/Visibility | 122 | 121 | 118 | 117 | 118 | 124 |
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. |
