Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2057 | 1863 | 2064 | 2003 | 2045 | 1994 |
| Tmin | 2069 | 1870 | 2075 | 2002 | 2050 | 2002 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 150 |
| Precipitation | 186 | 169 | 187 | 181 | 186 | 180 |
| Humidity/Visibility | 184 | 166 | 184 | 177 | 183 | 177 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2061 | 2066 | 2029 | 2095 | 2034 | 2114 |
| Tmin | 2071 | 2068 | 2035 | 2099 | 2039 | 2113 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 188 | 190 | 211 | 215 | 210 | 217 |
| Humidity/Visibility | 182 | 184 | 205 | 208 | 202 | 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. |
