Author: WEXA

Heat wave occuring from September 22 2025 to September 30 2025 at -71.0°S 296.5°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica

Duration: 9 days

Time span: September 22 2025 to September 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 7.4 °C
  • Mean temperature: -2.5 °C
  • Maximum temperature anomaly: 15.4 °C
  • Maximum temperature: 5.8 °C

Event center: -71.0°S 296.5°E

Area affected: 1411700 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-Sep-22_to_2025-Sep-30_296.5_-71.0

Heat wave occuring from September 22 2025 to September 25 2025 at -75.0°S 48.0°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica

Duration: 4 days

Time span: September 22 2025 to September 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 8.2 °C
  • Mean temperature: -43.3 °C
  • Maximum temperature anomaly: 10.8 °C
  • Maximum temperature: -38.7 °C

Event center: -75.0°S 48.0°E

Area affected: 154276 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-Sep-22_to_2025-Sep-25_48.0_-75.0

Cold spell occuring from September 22 2025 to October 07 2025 at 14.5°N 13.0°E

Download data: JSON

Event type: Cold spell

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

  • Cameroon
  • Chad
  • Niger
  • Nigeria

Duration: 16 days

Time span: September 22 2025 to October 07 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.6 °C
  • Mean temperature: 28.1 °C
  • Minimum temperature anomaly: -5.7 °C
  • Minimum temperature: 25.4 °C

Event center: 14.5°N 13.0°E

Area affected: 300344 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-Sep-22_to_2025-Oct-07_13.0_14.5

Cold spell occuring from September 21 2025 to September 28 2025 at 44.0°N 3.5°E

Download data: JSON

Event type: Cold spell

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

  • France
  • Germany
  • Italy
  • Luxembourg
  • Spain

Duration: 8 days

Time span: September 21 2025 to September 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.4 °C
  • Mean temperature: 10.7 °C
  • Minimum temperature anomaly: -7.1 °C
  • Minimum temperature: -1.1 °C

Event center: 44.0°N 3.5°E

Area affected: 718425 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-Sep-21_to_2025-Sep-28_3.5_44.0

Heat wave occuring from September 21 2025 to September 25 2025 at 74.0°N 320.5°E

Download data: JSON

Event type: Heat wave

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

  • Greenland

Duration: 5 days

Time span: September 21 2025 to September 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 9.1 °C
  • Mean temperature: -12.4 °C
  • Maximum temperature anomaly: 12.7 °C
  • Maximum temperature: -5.4 °C

Event center: 74.0°N 320.5°E

Area affected: 331210 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-Sep-21_to_2025-Sep-25_320.5_74.0

Heat wave occuring from September 21 2025 to September 24 2025 at -11.5°S 315.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 4 days

Time span: September 21 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 29.8 °C
  • Maximum temperature anomaly: 3.9 °C
  • Maximum temperature: 32.0 °C

Event center: -11.5°S 315.5°E

Area affected: 81686 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-Sep-21_to_2025-Sep-24_315.5_-11.5

Heat wave occuring from September 21 2025 to September 24 2025 at -18.5°S 320.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 4 days

Time span: September 21 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 24.6 °C
  • Maximum temperature anomaly: 1.6 °C
  • Maximum temperature: 25.2 °C

Event center: -18.5°S 320.5°E

Area affected: 81432 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-Sep-21_to_2025-Sep-24_320.5_-18.5

Cold spell occuring from September 21 2025 to September 27 2025 at -66.5°S 84.5°E

Download data: JSON

Event type: Cold spell

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

  • Antarctica

Duration: 7 days

Time span: September 21 2025 to September 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.8 °C
  • Mean temperature: -32.0 °C
  • Minimum temperature anomaly: -12.9 °C
  • Minimum temperature: -49.6 °C

Event center: -66.5°S 84.5°E

Area affected: 169426 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-Sep-21_to_2025-Sep-27_84.5_-66.5

Heat wave occuring from September 21 2025 to September 27 2025 at -46.5°S 186.0°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 7 days

Time span: September 21 2025 to September 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.0 °C
  • Mean temperature: 11.3 °C
  • Maximum temperature anomaly: 3.3 °C
  • Maximum temperature: 14.6 °C

Event center: -46.5°S 186.0°E

Area affected: 957219 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-Sep-21_to_2025-Sep-27_186.0_-46.5

Cold spell occuring from September 21 2025 to September 26 2025 at 50.5°N 356.0°E

Download data: JSON

Event type: Cold spell

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

  • United Kingdom

Duration: 6 days

Time span: September 21 2025 to September 26 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.4 °C
  • Mean temperature: 10.0 °C
  • Minimum temperature anomaly: -5.0 °C
  • Minimum temperature: 6.0 °C

Event center: 50.5°N 356.0°E

Area affected: 132460 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-Sep-21_to_2025-Sep-26_356.0_50.5