Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 976 | 889 | 998 | 985 | 1036 | 1015 |
| Tmin | 983 | 893 | 996 | 974 | 1039 | 1009 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 597 | 545 | 603 | 607 | 623 | 591 |
| Humidity/Visibility | 86 | 79 | 85 | 109 | 116 | 115 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1041 | 1044 | 1007 | 1026 | 1001 | 1040 |
| Tmin | 1040 | 1040 | 1008 | 1027 | 1000 | 1047 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 622 | 623 | 599 | 614 | 591 | 622 |
| Humidity/Visibility | 111 | 115 | 112 | 108 | 106 | 117 |
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. |
