# Les Rousses

Les Rousses (French pronunciation:) is a commune in the Canton of Hauts de Bienne of Jura department in the Bourgogne-Franche-Comté region in eastern France, on the Swiss border.
The Lac des Rousses is located northeast of the village of Les Rousses beside the road to the village of Bois d'Amont. The Lac de Lamoura is located southwest of the village of Les Rousses beside the road to the village of Lamoura. Other places include the village of Prémanon and La Cure, the transit point across the Swiss border towards Saint-Cergue.

## Climate

Climate data for Les Rousses (1981–2010 averages): elevation 1110m :
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Mean daily maximum °C (°F) | 3.0 (37.4) | 4.0 (39.2) | 6.9 (44.4) | 10.3 (50.5) | 15.3 (59.5) | 18.6 (65.5) | 21.1 (70.0) | 21.0 (69.8) | 17.0 (62.6) | 13.3 (55.9) | 6.5 (43.7) | 3.4 (38.1) | 11.7 (53.1) |
| Daily mean °C (°F) | −1.5 (29.3) | −0.7 (30.7) | 1.9 (35.4) | 5.0 (41.0) | 9.9 (49.8) | 12.8 (55.0) | 15.1 (59.2) | 15.0 (59.0) | 11.4 (52.5) | 8.2 (46.8) | 2.3 (36.1) | −0.5 (31.1) | 6.6 (43.8) |
| Mean daily minimum °C (°F) | −5.9 (21.4) | −5.5 (22.1) | −3.1 (26.4) | −0.3 (31.5) | 4.4 (39.9) | 7.1 (44.8) | 9.1 (48.4) | 9.0 (48.2) | 5.9 (42.6) | 3.1 (37.6) | −1.9 (28.6) | −4.4 (24.1) | 1.5 (34.6) |
| Average precipitation mm (inches) | 177.5 (6.99) | 159.4 (6.28) | 157.7 (6.21) | 140.8 (5.54) | 161.3 (6.35) | 155.4 (6.12) | 140.8 (5.54) | 148.0 (5.83) | 152.8 (6.02) | 172.5 (6.79) | 173.2 (6.82) | 195.8 (7.71) | 1,935.2 (76.2) |
| Source: Meteociel ||||||||||||||

## Population

| Year | Pop. | ±% p.a. |
| 1793 | 2,501 | — |
| 1800 | 2,240 | −1.56% |
| 1806 | 2,159 | −0.61% |
| 1821 | 2,278 | +0.36% |
| 1831 | 2,187 | −0.41% |
| 1836 | 2,163 | −0.22% |
| 1841 | 2,017 | −1.39% |
| 1846 | 2,254 | +2.25% |
| 1851 | 2,395 | +1.22% |
| 1856 | 2,555 | +1.30% |
| 1861 | 2,581 | +0.20% |
| 1866 | 2,472 | −0.86% |
| 1872 | 2,527 | +0.37% |
| 1876 | 2,518 | −0.09% |
| 1881 | 2,545 | +0.21% |
| 1886 | 2,941 | +2.93% |
| 1891 | 2,476 | −3.38% |
| 1896 | 2,258 | −1.83% |
| Year | Pop. | ±% p.a. |
| 1901 | 2,195 | −0.56% |
| 1906 | 2,148 | −0.43% |
| 1911 | 2,031 | −1.11% |
| 1921 | 1,701 | −1.76% |
| 1926 | 1,610 | −1.09% |
| 1931 | 1,571 | −0.49% |
| 1936 | 1,562 | −0.11% |
| 1946 | 1,533 | −0.19% |
| 1954 | 1,795 | +1.99% |
| 1962 | 1,731 | −0.45% |
| 1968 | 1,755 | +0.23% |
| 1975 | 2,061 | +2.32% |
| 1982 | 2,331 | +1.77% |
| 1990 | 2,840 | +2.50% |
| 1999 | 2,927 | +0.34% |
| 2007 | 3,017 | +0.38% |
| 2012 | 3,133 | +0.76% |
| 2017 | 3,630 | +2.99% |
Source: EHESS and INSEE (1968-2017) :

## Tourism

Les Rousses includes part of the Upper Jura Natural Park and Fort des Rousses (fr), an historical fortress that, until 1997, was used as a commando training site. The fortress includes an underground labyrinth used in training, that is open to the public.
Les Rousses has an extensive ski area, especially for cross-country skiing. Many villages have their own runs using a common lift pass.
* Alpine
** Massif du Noirmont
** Massif des Tuffes
** Porte des Jouvencelles
** Porte de la Darbella
** Porte de la Serra
** Porte de la Combe de lac
** Porte de la Giraude
* Nordic
** Secteur de Bellefontaine
** Secteur du Risoux
** Secteur de l'Orbe
** Secteur de la Sambine
** Secteur du Massacre
** Secteur de Longchamois
** Secteur de Lamoura/Serra