Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1049 | 981 | 1085 | 1065 | 1112 | 1080 |
| Tmin | 1051 | 982 | 1085 | 1065 | 1112 | 1078 |
| Duration of sunshine | 93 | 140 | 186 | 180 | 186 | 240 |
| Precipitation | 93 | 85 | 95 | 109 | 126 | 120 |
| Humidity/Visibility | 92 | 84 | 92 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1113 | 1114 | 1076 | 1109 | 1079 | 1111 |
| Tmin | 1116 | 1114 | 1076 | 1109 | 1078 | 1116 |
| Duration of sunshine | 248 | 155 | 180 | 155 | 240 | 186 |
| Precipitation | 126 | 129 | 120 | 122 | 120 | 124 |
| Humidity/Visibility | 122 | 121 | 118 | 117 | 118 | 123 |
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. |
