Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1079 | 937 | 1023 | 1004 | 1054 | 1019 |
| Tmin | 1018 | 896 | 992 | 975 | 1021 | 987 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 121 | 81 | 62 | 75 | 95 | 90 |
| Humidity/Visibility | 40 | 10 | 8 | 22 | 38 | 37 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1056 | 1054 | 1010 | 1037 | 1018 | 1076 |
| Tmin | 1023 | 1035 | 1008 | 1010 | 988 | 1043 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 95 | 93 | 85 | 58 | 116 | 153 |
| Humidity/Visibility | 51 | 51 | 44 | 16 | 21 | 45 |
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. |
