Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 2142 | 1958 | 2148 | 2079 | 2169 | 2100 |
| Tmin | 2131 | 1935 | 2139 | 2076 | 2167 | 2097 |
| Duration of sunshine | 248 | 254 | 217 | 270 | 279 | 240 |
| Precipitation | 117 | 106 | 117 | 114 | 116 | 108 |
| Humidity/Visibility | 54 | 53 | 55 | 60 | 84 | 80 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 2164 | 2161 | 2097 | 2171 | 2099 | 2170 |
| Tmin | 2164 | 2159 | 2098 | 2168 | 2099 | 2168 |
| Duration of sunshine | 310 | 248 | 300 | 279 | 240 | 248 |
| Precipitation | 111 | 122 | 116 | 127 | 119 | 130 |
| Humidity/Visibility | 71 | 67 | 74 | 74 | 102 | 70 |
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. |
