Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1025 | 933 | 1035 | 1000 | 1033 | 997 |
| Tmin | 1032 | 931 | 1037 | 999 | 1035 | 1002 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 126 | 110 | 133 | 141 | 153 | 142 |
| Humidity/Visibility | 80 | 71 | 76 | 76 | 73 | 74 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1035 | 1029 | 1007 | 1058 | 1010 | 1051 |
| Tmin | 1041 | 1032 | 1001 | 1048 | 1005 | 1068 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 151 | 158 | 146 | 172 | 155 | 179 |
| Humidity/Visibility | 81 | 79 | 78 | 114 | 103 | 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. |
