Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 351 | 306 | 338 | 385 | 402 | 407 |
| Tmin | 362 | 314 | 337 | 392 | 405 | 400 |
| Duration of sunshine | 236 | 142 | 182 | 266 | 246 | 246 |
| Precipitation | 113 | 104 | 113 | 140 | 145 | 138 |
| Humidity/Visibility | 43 | 28 | 25 | 84 | 87 | 93 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 396 | 413 | 385 | 403 | 393 | 374 |
| Tmin | 399 | 415 | 397 | 407 | 387 | 379 |
| Duration of sunshine | 334 | 321 | 300 | 311 | 262 | 279 |
| Precipitation | 138 | 130 | 125 | 142 | 146 | 148 |
| Humidity/Visibility | 84 | 95 | 79 | 81 | 81 | 57 |
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