Death Valley's Record Heat: 134°F (56.7°C) — Hottest on Earth

The highest air temperature ever reliably recorded on Earth: 134°F (56.7°C) at Furnace Creek Ranch, Death Valley, California on July 10, 1913.

Context

• Location: Furnace Creek (formerly Greenland Ranch), -190 ft (-58 m) below sea level
• Instrument: Standard Stevenson screen, US Weather Bureau
• Observer: Oscar Denton (ranch caretaker)
• Verification: Accepted by WMO (World Meteorological Organization) after 2012 review disqualified Libya's 136.4°F (1922)

Typical Summer Extremes

• July average high: 116°F (47°C)
• Days ≥120°F (49°C): ~15-20 per year
• Days ≥125°F (52°C): ~2-5 per year
• Overnight lows: Often >100°F (38°C) — no relief

Why Death Valley?

• Below sea level: Air compresses, heats adiabatically
• Basin geometry: Mountains trap hot air; minimal mixing
• Aridity: <2 in rain/year; no evaporative cooling
• Dark ground: Absorbs maximum solar radiation
• Clear skies: Intense insolation

Modern Monitoring

Furnace Creek still operates (NWS/Death Valley NP). Recent near-misses: 130°F (54.4°C) Aug 2020, July 2021. Ground temperatures regularly exceed 170°F (77°C).

Visiting Safely

• AC-equipped vehicle essential
• 4L water/person/day minimum
• No hiking after 10 AM
• Cell service spotty; satellite messenger wise
• Summer = extreme risk; spring/fall ideal

Death Valley isn't just hot—it's the planetary benchmark for heat.