Category: Heat waves affecting Antarctica

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 7 days

Time span: December 28 2025 to January 03 2026

Statistics over entire affected area:

• Mean temperature anomaly: 1.5 °C
• Mean temperature: 2.4 °C
• Maximum temperature anomaly: 2.6 °C
• Maximum temperature: 5.5 °C

Event center: -65.0°S 280.5°E

Area affected: 632095 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-28_to_2026-Jan-03_280.5_-65.0

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 12 days

Time span: December 21 2025 to January 01 2026

Statistics over entire affected area:

• Mean temperature anomaly: 1.3 °C
• Mean temperature: 1.4 °C
• Maximum temperature anomaly: 2.5 °C
• Maximum temperature: 2.8 °C

Event center: -68.0°S 289.5°E

Area affected: 92172 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-21_to_2026-Jan-01_289.5_-68.0

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 9 days

Time span: December 14 2025 to December 22 2025

Statistics over entire affected area:

• Mean temperature anomaly: 1.4 °C
• Mean temperature: 0.5 °C
• Maximum temperature anomaly: 1.9 °C
• Maximum temperature: 1.2 °C

Event center: -65.5°S 322.0°E

Area affected: 877385 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-14_to_2025-Dec-22_322.0_-65.5

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 7 days

Time span: December 10 2025 to December 16 2025

Statistics over entire affected area:

• Mean temperature anomaly: 5.1 °C
• Mean temperature: -12.5 °C
• Maximum temperature anomaly: 8.0 °C
• Maximum temperature: -7.6 °C

Event center: -77.5°S 233.5°E

Area affected: 87911 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-10_to_2025-Dec-16_233.5_-77.5

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 5 days

Time span: December 07 2025 to December 11 2025

Statistics over entire affected area:

• Mean temperature anomaly: 1.9 °C
• Mean temperature: 3.2 °C
• Maximum temperature anomaly: 2.8 °C
• Maximum temperature: 5.4 °C

Event center: -63.0°S 284.5°E

Area affected: 164308 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-07_to_2025-Dec-11_284.5_-63.0

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 13 days

Time span: December 04 2025 to December 16 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.2 °C
• Mean temperature: -0.3 °C
• Maximum temperature anomaly: 6.6 °C
• Maximum temperature: 1.9 °C

Event center: -70.5°S 299.0°E

Area affected: 198961 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-04_to_2025-Dec-16_299.0_-70.5

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 13 days

Time span: December 03 2025 to December 15 2025

Statistics over entire affected area:

• Mean temperature anomaly: 4.1 °C
• Mean temperature: -4.2 °C
• Maximum temperature anomaly: 9.4 °C
• Maximum temperature: 3.5 °C

Event center: -65.5°S 295.0°E

Area affected: 1376359 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-03_to_2025-Dec-15_295.0_-65.5

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 7 days

Time span: December 03 2025 to December 09 2025

Statistics over entire affected area:

• Mean temperature anomaly: 4.5 °C
• Mean temperature: -17.3 °C
• Maximum temperature anomaly: 6.9 °C
• Maximum temperature: -7.9 °C

Event center: -84.0°S 162.5°E

Area affected: 69135 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Dec-03_to_2025-Dec-09_162.5_-84.0

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 8 days

Time span: November 26 2025 to December 03 2025

Statistics over entire affected area:

• Mean temperature anomaly: 2.4 °C
• Mean temperature: 0.2 °C
• Maximum temperature anomaly: 3.8 °C
• Maximum temperature: 1.2 °C

Event center: -64.5°S 159.5°E

Area affected: 343080 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Nov-26_to_2025-Dec-03_159.5_-64.5

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

• Antarctica

Duration: 12 days

Time span: November 24 2025 to December 05 2025

Statistics over entire affected area:

• Mean temperature anomaly: 2.0 °C
• Mean temperature: 4.7 °C
• Maximum temperature anomaly: 3.7 °C
• Maximum temperature: 9.6 °C

Event center: -64.0°S 269.0°E

Area affected: 2360791 km$^2$

Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.

Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.

Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2025-Nov-24_to_2025-Dec-05_269.0_-64.0