Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1012 | 954 | 1049 | 1043 | 1068 | 1048 |
| Tmin | 1013 | 952 | 1049 | 1044 | 1070 | 1047 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 57 | 65 | 90 | 93 | 95 |
| Humidity/Visibility | 61 | 54 | 60 | 83 | 87 | 86 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1084 | 1082 | 1033 | 1074 | 1046 | 1075 |
| Tmin | 1085 | 1084 | 1035 | 1076 | 1046 | 1085 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 96 | 100 | 90 | 94 | 91 | 96 |
| Humidity/Visibility | 91 | 90 | 88 | 84 | 86 | 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. |
