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Pic is from off trail in the high Sierra, around 11,000ft. Early August but there were glacial fields and got into the 20s at night. Didn't bring a tent and wasn't well prepared for the temperatures. Hiked to a lot of cool lakes with no trails going to them, went swimming, and didn't see anyone at all for miles. Water filter froze overnight but fortunately the water is so clean you can drink straight from it without filtering.