Sunlight in Antarctica: December (Midnight Sun) vs. June (Polar Night)

Antarctica's Extreme Seasonal Sunlight

At the South Pole, the sun's behavior is defined by Earth's axial tilt, creating extremes unlike anywhere else.

December – Summer Solstice (Midnight Sun / Polar Day)

• Sun remains continuously above the horizon for 24 hours.
• Reaches highest altitude (~23.5° above horizon at pole).
• Constant daylight enables extended outdoor research, higher temperatures (still below freezing), coastal melting.
• Circadian rhythm disruption possible; "Midnight Sun" phenomenon.

June – Winter Solstice (Polar Night / Winter Darkness)

• Sun stays below horizon for 24 hours—total darkness.
• Extreme cold (often -60°C / -76°F or lower).
• Research stations operate with skeleton crews; outdoor work dangerous.
• Psychological effects: seasonal affective disorder (SAD), sleep disruption.

Latitude Variation

Coastal stations (e.g., McMurdo, 78°S) experience shorter polar night/day cycles than the pole (90°S), with twilight periods in between.