Author: WEXA

Heat wave occuring from December 18 2025 to December 27 2025 at 10.5°N 104.0°E

Download data: JSON

Event type: Heat wave

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

  • Cambodia
  • Viet Nam

Duration: 10 days

Time span: December 18 2025 to December 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.6 °C
  • Mean temperature: 27.8 °C
  • Maximum temperature anomaly: 2.5 °C
  • Maximum temperature: 28.8 °C

Event center: 10.5°N 104.0°E

Area affected: 106500 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-18_to_2025-Dec-27_104.0_10.5

Heat wave occuring from December 18 2025 to December 28 2025 at -13.5°S 187.5°E

Download data: JSON

Event type: Heat wave

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

  • Samoa

Duration: 11 days

Time span: December 18 2025 to December 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 28.3 °C
  • Maximum temperature anomaly: 1.9 °C
  • Maximum temperature: 29.0 °C

Event center: -13.5°S 187.5°E

Area affected: 887858 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-18_to_2025-Dec-28_187.5_-13.5

Heat wave occuring from December 18 2025 to January 11 2026 at -34.0°S 307.0°E

Download data: JSON

Event type: Heat wave

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

  • Argentina
  • Brazil
  • Chile
  • Uruguay

Duration: 25 days

Time span: December 18 2025 to January 11 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 4.5 °C
  • Mean temperature: 22.2 °C
  • Maximum temperature anomaly: 11.7 °C
  • Maximum temperature: 34.9 °C

Event center: -34.0°S 307.0°E

Area affected: 1791321 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-18_to_2026-Jan-11_307.0_-34.0

Heat wave occuring from December 18 2025 to December 22 2025 at -26.5°S 15.5°E

Download data: JSON

Event type: Heat wave

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

  • Namibia
  • South Africa

Duration: 5 days

Time span: December 18 2025 to December 22 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.8 °C
  • Mean temperature: 28.4 °C
  • Maximum temperature anomaly: 6.6 °C
  • Maximum temperature: 31.9 °C

Event center: -26.5°S 15.5°E

Area affected: 173033 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-18_to_2025-Dec-22_15.5_-26.5

Heat wave occuring from December 18 2025 to December 20 2025 at -25.0°S 129.5°E

Download data: JSON

Event type: Heat wave

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

  • Australia

Duration: 3 days

Time span: December 18 2025 to December 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.3 °C
  • Mean temperature: 34.0 °C
  • Maximum temperature anomaly: 6.2 °C
  • Maximum temperature: 35.3 °C

Event center: -25.0°S 129.5°E

Area affected: 53098 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-18_to_2025-Dec-20_129.5_-25.0

Heat wave occuring from December 17 2025 to December 25 2025 at 25.5°N 72.5°E

Download data: JSON

Event type: Heat wave

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

  • India
  • Pakistan

Duration: 9 days

Time span: December 17 2025 to December 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.8 °C
  • Mean temperature: 21.2 °C
  • Maximum temperature anomaly: 6.6 °C
  • Maximum temperature: 24.4 °C

Event center: 25.5°N 72.5°E

Area affected: 218988 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-17_to_2025-Dec-25_72.5_25.5

Cold spell occuring from December 17 2025 to December 20 2025 at -8.0°S 289.5°E

Download data: JSON

Event type: Cold spell

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

  • Brazil

Duration: 4 days

Time span: December 17 2025 to December 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.0 °C
  • Mean temperature: 23.5 °C
  • Minimum temperature anomaly: -4.1 °C
  • Minimum temperature: 21.2 °C

Event center: -8.0°S 289.5°E

Area affected: 168383 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: Cold_spell_2025-Dec-17_to_2025-Dec-20_289.5_-8.0

Cold spell occuring from December 17 2025 to December 21 2025 at 55.5°N 273.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 5 days

Time span: December 17 2025 to December 21 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -12.7 °C
  • Mean temperature: -32.7 °C
  • Minimum temperature anomaly: -15.9 °C
  • Minimum temperature: -35.8 °C

Event center: 55.5°N 273.0°E

Area affected: 112783 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: Cold_spell_2025-Dec-17_to_2025-Dec-21_273.0_55.5

Heat wave occuring from December 17 2025 to December 23 2025 at 49.0°N 23.0°E

Download data: JSON

Event type: Heat wave

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

  • Hungary
  • Poland
  • Slovakia
  • Ukraine

Duration: 7 days

Time span: December 17 2025 to December 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.5 °C
  • Mean temperature: 4.1 °C
  • Maximum temperature anomaly: 9.4 °C
  • Maximum temperature: 7.8 °C

Event center: 49.0°N 23.0°E

Area affected: 69291 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-17_to_2025-Dec-23_23.0_49.0

Heat wave occuring from December 17 2025 to December 23 2025 at 42.0°N 37.0°E

Download data: JSON

Event type: Heat wave

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

  • Türkiye

Duration: 7 days

Time span: December 17 2025 to December 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.6 °C
  • Mean temperature: 12.5 °C
  • Maximum temperature anomaly: 5.2 °C
  • Maximum temperature: 13.6 °C

Event center: 42.0°N 37.0°E

Area affected: 57405 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-17_to_2025-Dec-23_37.0_42.0