Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 58 | 48 | 55 | 71 | 85 | 86 |
| Tmin | 54 | 54 | 57 | 74 | 86 | 83 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 64 | 58 | 63 | 79 | 94 | 94 |
| Humidity/Visibility | 44 | 39 | 43 | 56 | 64 | 63 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 82 | 87 | 80 | 73 | 70 | 78 |
| Tmin | 88 | 85 | 87 | 82 | 79 | 89 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 99 | 97 | 92 | 93 | 94 | 98 |
| Humidity/Visibility | 62 | 66 | 64 | 62 | 59 | 65 |
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. |
