Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 69 | 56 | 71 | 65 | 73 | 68 |
| Tmin | 71 | 60 | 73 | 76 | 81 | 70 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 87 | 95 | 108 | 124 | 120 |
| Humidity/Visibility | 92 | 83 | 91 | 104 | 123 | 119 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 71 | 63 | 67 | 87 | 90 | 95 |
| Tmin | 78 | 69 | 68 | 91 | 92 | 97 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 129 | 120 | 124 | 120 | 124 |
| Humidity/Visibility | 122 | 121 | 118 | 117 | 118 | 124 |
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. |
