Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2078 | 1893 | 2092 | 2027 | 2083 | 2025 |
| Tmin | 2082 | 1901 | 2097 | 2028 | 2083 | 2029 |
| Duration of sunshine | 62 | 86 | 93 | 90 | 124 | 150 |
| Precipitation | 190 | 172 | 194 | 185 | 196 | 182 |
| Humidity/Visibility | 179 | 159 | 171 | 165 | 168 | 165 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2088 | 2093 | 2050 | 2121 | 2058 | 2128 |
| Tmin | 2105 | 2099 | 2054 | 2128 | 2062 | 2129 |
| Duration of sunshine | 155 | 124 | 120 | 124 | 90 | 93 |
| Precipitation | 187 | 195 | 216 | 218 | 214 | 228 |
| Humidity/Visibility | 167 | 171 | 188 | 197 | 202 | 211 |
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. |
