Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2084 | 1898 | 2094 | 2028 | 2078 | 2026 |
| Tmin | 2085 | 1902 | 2096 | 2031 | 2082 | 2030 |
| Duration of sunshine | 62 | 57 | 62 | 60 | 124 | 120 |
| Precipitation | 188 | 169 | 188 | 182 | 186 | 181 |
| Humidity/Visibility | 182 | 165 | 183 | 176 | 181 | 176 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2099 | 2097 | 2051 | 2124 | 2064 | 2131 |
| Tmin | 2106 | 2098 | 2059 | 2124 | 2069 | 2123 |
| Duration of sunshine | 124 | 62 | 60 | 93 | 60 | 62 |
| Precipitation | 187 | 190 | 210 | 215 | 210 | 217 |
| Humidity/Visibility | 181 | 181 | 201 | 205 | 205 | 214 |
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. |
