Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1350 | 1224 | 1351 | 1306 | 1348 | 1298 |
| Tmin | 1211 | 1094 | 1211 | 1171 | 1212 | 1171 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 129 | 113 | 126 | 128 | 130 | 118 |
| Humidity/Visibility | 108 | 104 | 105 | 100 | 104 | 94 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1345 | 1341 | 1298 | 1352 | 1306 | 1358 |
| Tmin | 1211 | 1210 | 1176 | 1210 | 1170 | 1213 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 124 | 123 | 128 | 123 | 129 | 133 |
| Humidity/Visibility | 100 | 101 | 93 | 109 | 107 | 114 |
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. |
