Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 1004 | 922 | 1016 | 974 | 1013 | 1013 |
| Tmin | 1005 | 922 | 1011 | 977 | 1010 | 1006 |
| Durée d’insolation | 0 | 0 | 0 | 0 | 0 | 0 |
| Précipitation | 537 | 485 | 538 | 536 | 546 | 531 |
| Humidité/Visibilité | 89 | 81 | 88 | 100 | 116 | 114 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 1015 | 1005 | 968 | 977 | 953 | 988 |
| Tmin | 1015 | 1015 | 963 | 982 | 955 | 986 |
| Durée d’insolation | 0 | 0 | 0 | 0 | 0 | 0 |
| Précipitation | 561 | 546 | 510 | 552 | 536 | 52 |
| Humidité/Visibilité | 118 | 112 | 115 | 115 | 113 | 121 |
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. |
