Online Highways Home > California > Hetch Hetchy Weather Station of the U.S. Weather Service Located in Tuolumne County, California, Hetch Hetchy is at an elevation of 3870 feet and was established as a weather station on 01 Jan 1931. From 1971 to 2000, the following average readings were recorded: - - - - - - - - - JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR Average High....... 48.0 52.5 56.1 62.1 69.2 77.8 84.6 84.7 79.3 70.2 55.9 47.9 65.7 Average Low........ 30.3 31.4 33.7 37.8 44.0 50.6 56.2 56.0 51.2 43.1 34.6 30.2 41.6 Monthly Precipitn.. 6.38 6.10 5.82 2.99 1.77 .82 .28 .21 .95 2.20 4.44 4.63 36.59 Heating Degree Days 802 646 623 458 292 100 20 20 91 290 593 805 4740 Cooling Degree Days 0 0 0 7 31 75 188 186 100 31 1 0 619 See more Science. Other upcoming events include:

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