Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1019 | 922 | 1022 | 987 | 1039 | 1013 |
| Tmin | 1168 | 1056 | 1175 | 1139 | 1192 | 1164 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 87 | 96 | 108 | 126 | 122 |
| Humidity/Visibility | 91 | 82 | 91 | 100 | 118 | 116 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1045 | 1037 | 1011 | 1043 | 1013 | 1049 |
| Tmin | 1200 | 1189 | 1157 | 1196 | 1162 | 1203 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 126 | 124 | 122 | 121 | 127 |
| Humidity/Visibility | 117 | 109 | 112 | 112 | 116 | 120 |
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. |
