Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 499 | 445 | 496 | 515 | 529 | 513 |
| Tmin | 446 | 402 | 459 | 484 | 499 | 487 |
| Duration of sunshine | 222 | 162 | 180 | 267 | 217 | 212 |
| Precipitation | 123 | 114 | 123 | 150 | 156 | 155 |
| Humidity/Visibility | 59 | 39 | 46 | 100 | 104 | 99 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 532 | 512 | 496 | 533 | 503 | 490 |
| Tmin | 505 | 491 | 479 | 509 | 473 | 470 |
| Duration of sunshine | 248 | 302 | 289 | 316 | 255 | 273 |
| Precipitation | 156 | 158 | 153 | 159 | 156 | 142 |
| Humidity/Visibility | 108 | 90 | 89 | 102 | 84 | 66 |
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. |
Arturo Michelena IAP