Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1140 | 1037 | 1147 | 1121 | 1175 | 1138 |
| Tmin | 1141 | 1037 | 1146 | 1125 | 1175 | 1137 |
| Duration of sunshine | 307 | 307 | 372 | 336 | 428 | 416 |
| Precipitation | 95 | 88 | 93 | 108 | 130 | 120 |
| Humidity/Visibility | 90 | 82 | 90 | 103 | 120 | 117 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1174 | 1150 | 1109 | 1147 | 1108 | 1145 |
| Tmin | 1172 | 1147 | 1110 | 1147 | 1109 | 1144 |
| Duration of sunshine | 394 | 309 | 328 | 338 | 263 | 332 |
| Precipitation | 128 | 126 | 120 | 122 | 121 | 132 |
| Humidity/Visibility | 120 | 120 | 117 | 115 | 116 | 118 |
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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