Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 1106 | 1016 | 1124 | 1084 | 1121 | 1082 |
| Tmin | 1106 | 1012 | 1118 | 1089 | 1122 | 1088 |
| Duration of sunshine | 22 | 19 | 19 | 14 | 24 | 34 |
| Precipitation | 814 | 757 | 828 | 827 | 883 | 844 |
| Humidity/Visibility | 40 | 51 | 51 | 68 | 81 | 88 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 1117 | 1114 | 1084 | 1120 | 1082 | 1121 |
| Tmin | 1118 | 1116 | 1081 | 1119 | 1084 | 1121 |
| Duration of sunshine | 18 | 15 | 13 | 24 | 27 | 25 |
| Precipitation | 864 | 847 | 822 | 841 | 818 | 856 |
| Humidity/Visibility | 88 | 75 | 60 | 56 | 59 | 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. |
Crozet