Number of days available for climatic review
| Paramètre | jan | fev | mar | avr | mai | juin |
| Tmax | 1063 | 974 | 1071 | 1061 | 1091 | 1065 |
| Tmin | 1069 | 978 | 1071 | 1069 | 1108 | 1070 |
| Durée d’insolation | 0 | 0 | 0 | 0 | 0 | 0 |
| Précipitation | 99 | 98 | 104 | 132 | 135 | 123 |
| Humidité/Visibilité | 88 | 79 | 84 | 108 | 111 | 112 |
| Paramètre | juillet | août | sep | oct | nov | déc |
| Tmax | 1097 | 1101 | 1062 | 1100 | 1064 | 1101 |
| Tmin | 1098 | 1097 | 1071 | 1094 | 1064 | 1107 |
| Durée d’insolation | 0 | 0 | 0 | 0 | 0 | 0 |
| Précipitation | 128 | 126 | 121 | 125 | 136 | 133 |
| Humidité/Visibilité | 109 | 112 | 112 | 108 | 103 | 113 |
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. |
