Monte San LorenzoMonte San Lorenzo at a Glance
About Monte San Lorenzo
Monte San Lorenzo (also known as Cerro San Lorenzo) is a high, glaciated mountain massif on the border between Argentina and Chile in southern Patagonia, with an elevation of approximately 3,706 metres. It is a prominent peak in the southern Andes and a notable objective for alpine climbers.
The mountain is sought by mountaineers for its steep, glacier-covered faces and remote alpine environment; ascents require glacier travel and technical experience. The surrounding area offers rugged Patagonian landscapes, glaciers and long approach routes.
The massif has long been known to local populations and to climbers exploring the southern Andes; detailed historical accounts of first ascents are part of mountaineering literature but vary by route and national records.
Monte San Lorenzo straddles the Argentina-Chile border in Patagonia, lying within the high Andes of the region and forming part of the range of peaks that separates the two countries.
- Climbing character: The massif is extensively glaciated and presents technical routes that attract experienced mountaineers rather than casual walkers.
Best Time to Visit Monte San Lorenzo
The austral summer (December-February) is the window for mountaineering on Monte San Lorenzo; expect cold, wind and rapid weather changes even then.
Weather & Climate near Monte San Lorenzo
Monte San Lorenzo's climate is classified as Ice Cap - Ice Cap climate with freezing summers (peaking in January) and freezing winters (coldest in July). Temperatures range from -14°C to 4°C. Moderate rainfall (730 mm/year).
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | -5° - 4° | -9° | 55 mm | - | - | 14.9 m/s | - | - |
| February | - | -5° - 3° | -9° | 75 mm | - | - | 13.2 m/s | - | - |
| March | - | -7° - 2° | -11° | 94 mm | - | - | 13.9 m/s | - | - |
| April | - | -10° - -1° | -15° | 78 mm | - | - | 14.1 m/s | - | - |
| May | - | -12° - -4° | -19° | 44 mm | - | - | 14.3 m/s | - | - |
| June | - | -14° - -7° | -22° | 52 mm | - | - | 14.1 m/s | - | - |
| July | - | -14° - -7° | -22° | 51 mm | - | - | 13.6 m/s | - | - |
| August | - | -14° - -6° | -21° | 54 mm | - | - | 13.1 m/s | - | - |
| September | - | -12° - -4° | -19° | 47 mm | - | - | 13.3 m/s | - | - |
| October | - | -10° - -1° | -16° | 53 mm | - | - | 14.1 m/s | - | - |
| November | - | -8° - 1° | -13° | 66 mm | - | - | 14.4 m/s | - | - |
| December | - | -6° - 3° | -11° | 61 mm | - | - | 14.9 m/s | - | - |
How to Get to Monte San Lorenzo
Monte San Lorenzo sits on the border between Argentina and Chile in southern Patagonia. Access routes vary depending on the side of approach; expeditions typically operate from regional towns with guides and 4x4 logistics. Check border and permit requirements before planning travel.
Tips for Visiting Monte San Lorenzo
- Climbers should plan for glacier travel; glaciers around Monte San Lorenzo are crevassed and require technical gear.
- Check border regulations if approaching from the Chilean side-this mountain straddles Argentina and Chile.
- Hire a local alpine guide for ascents; routes are complex and weather changes rapidly.