Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2097 | 1896 | 2092 | 2032 | 2081 | 2028 |
| Tmin | 2100 | 1902 | 2101 | 2032 | 2084 | 2030 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 93 | 90 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 184 | 177 | 182 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2095 | 2096 | 2060 | 2119 | 2062 | 2131 |
| Tmin | 2100 | 2100 | 2066 | 2126 | 2069 | 2130 |
| Duration of sunshine | 93 | 62 | 60 | 62 | 60 | 62 |
| Precipitation | 188 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 184 | 205 | 208 | 203 | 215 |
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. |
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