Author: WEXA

Heat wave occuring from September 13 2025 to September 17 2025 at -37.5°S 153.0°E

Download data: JSON

Event type: Heat wave

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

  • Australia
  • New Zealand

Duration: 5 days

Time span: September 13 2025 to September 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.5 °C
  • Mean temperature: 14.7 °C
  • Maximum temperature anomaly: 6.6 °C
  • Maximum temperature: 21.7 °C

Event center: -37.5°S 153.0°E

Area affected: 1656781 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-13_to_2025-Sep-17_153.0_-37.5

Cold spell occuring from September 12 2025 to September 15 2025 at -64.0°S 109.5°E

Download data: JSON

Event type: Cold spell

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

  • Antarctica

Duration: 4 days

Time span: September 12 2025 to September 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.4 °C
  • Mean temperature: -19.5 °C
  • Minimum temperature anomaly: -9.5 °C
  • Minimum temperature: -22.3 °C

Event center: -64.0°S 109.5°E

Area affected: 176790 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-12_to_2025-Sep-15_109.5_-64.0

Cold spell occuring from September 12 2025 to September 17 2025 at 39.5°N 54.0°E

Download data: JSON

Event type: Cold spell

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

  • Turkmenistan

Duration: 6 days

Time span: September 12 2025 to September 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.5 °C
  • Mean temperature: 20.5 °C
  • Minimum temperature anomaly: -7.9 °C
  • Minimum temperature: 16.1 °C

Event center: 39.5°N 54.0°E

Area affected: 98280 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-12_to_2025-Sep-17_54.0_39.5

Cold spell occuring from September 12 2025 to September 19 2025 at 41.0°N 46.0°E

Download data: JSON

Event type: Cold spell

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

  • Armenia
  • Azerbaijan
  • Georgia
  • Iran, Islamic Republic of
  • Kazakhstan
  • Russian Federation

Duration: 8 days

Time span: September 12 2025 to September 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.3 °C
  • Mean temperature: 15.4 °C
  • Minimum temperature anomaly: -7.9 °C
  • Minimum temperature: 0.1 °C

Event center: 41.0°N 46.0°E

Area affected: 310852 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-12_to_2025-Sep-19_46.0_41.0

Heat wave occuring from September 11 2025 to September 16 2025 at 15.5°N 97.0°E

Download data: JSON

Event type: Heat wave

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

  • India
  • Myanmar
  • Thailand

Duration: 6 days

Time span: September 11 2025 to September 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 27.6 °C
  • Maximum temperature anomaly: 1.6 °C
  • Maximum temperature: 28.1 °C

Event center: 15.5°N 97.0°E

Area affected: 116501 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-11_to_2025-Sep-16_97.0_15.5

Cold spell occuring from September 11 2025 to September 13 2025 at 19.0°N 77.0°E

Download data: JSON

Event type: Cold spell

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

  • India

Duration: 3 days

Time span: September 11 2025 to September 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.9 °C
  • Mean temperature: 24.7 °C
  • Minimum temperature anomaly: -3.0 °C
  • Minimum temperature: 23.1 °C

Event center: 19.0°N 77.0°E

Area affected: 109218 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-11_to_2025-Sep-13_77.0_19.0

Cold spell occuring from September 11 2025 to September 19 2025 at 18.5°N 271.5°E

Download data: JSON

Event type: Cold spell

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

  • Belize
  • Guatemala
  • Mexico

Duration: 9 days

Time span: September 11 2025 to September 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.0 °C
  • Mean temperature: 25.5 °C
  • Minimum temperature anomaly: -2.7 °C
  • Minimum temperature: 24.7 °C

Event center: 18.5°N 271.5°E

Area affected: 52646 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-11_to_2025-Sep-19_271.5_18.5

Cold spell occuring from September 11 2025 to September 15 2025 at 60.0°N 200.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 5 days

Time span: September 11 2025 to September 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.6 °C
  • Mean temperature: 5.4 °C
  • Minimum temperature anomaly: -5.3 °C
  • Minimum temperature: 0.5 °C

Event center: 60.0°N 200.0°E

Area affected: 181706 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-11_to_2025-Sep-15_200.0_60.0

Heat wave occuring from September 10 2025 to September 15 2025 at -70.0°S 37.5°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica

Duration: 6 days

Time span: September 10 2025 to September 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 9.3 °C
  • Mean temperature: -24.6 °C
  • Maximum temperature anomaly: 14.6 °C
  • Maximum temperature: -7.1 °C

Event center: -70.0°S 37.5°E

Area affected: 749422 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-10_to_2025-Sep-15_37.5_-70.0

Heat wave occuring from September 10 2025 to September 15 2025 at -12.5°S 314.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 6 days

Time span: September 10 2025 to September 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.5 °C
  • Mean temperature: 27.6 °C
  • Maximum temperature anomaly: 4.0 °C
  • Maximum temperature: 30.0 °C

Event center: -12.5°S 314.5°E

Area affected: 66177 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-10_to_2025-Sep-15_314.5_-12.5