Author: WEXA

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

Cold spell occuring from December 17 2025 to December 19 2025 at -22.5°S 315.0°E

Download data: JSON

Event type: Cold spell

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

  • Brazil

Duration: 3 days

Time span: December 17 2025 to December 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.3 °C
  • Mean temperature: 19.2 °C
  • Minimum temperature anomaly: -4.5 °C
  • Minimum temperature: 16.4 °C

Event center: -22.5°S 315.0°E

Area affected: 65360 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-19_315.0_-22.5

Heat wave occuring from December 16 2025 to December 18 2025 at 46.5°N 108.5°E

Download data: JSON

Event type: Heat wave

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

  • Mongolia

Duration: 3 days

Time span: December 16 2025 to December 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.7 °C
  • Mean temperature: -10.5 °C
  • Maximum temperature anomaly: 9.6 °C
  • Maximum temperature: -6.9 °C

Event center: 46.5°N 108.5°E

Area affected: 76557 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-16_to_2025-Dec-18_108.5_46.5

Heat wave occuring from December 16 2025 to December 23 2025 at 40.0°N 19.0°E

Download data: JSON

Event type: Heat wave

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

  • Bosnia and Herzegovina
  • Croatia
  • Greece

Duration: 8 days

Time span: December 16 2025 to December 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.9 °C
  • Mean temperature: 13.9 °C
  • Maximum temperature anomaly: 8.1 °C
  • Maximum temperature: 17.3 °C

Event center: 40.0°N 19.0°E

Area affected: 90986 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-16_to_2025-Dec-23_19.0_40.0

Heat wave occuring from December 16 2025 to December 20 2025 at -0.5°S 111.5°E

Download data: JSON

Event type: Heat wave

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

  • Indonesia
  • Malaysia

Duration: 5 days

Time span: December 16 2025 to December 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 26.8 °C
  • Maximum temperature anomaly: 1.7 °C
  • Maximum temperature: 28.0 °C

Event center: -0.5°S 111.5°E

Area affected: 67992 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-16_to_2025-Dec-20_111.5_-0.5