Author: WEXA

Cold spell occuring from September 21 2025 to September 25 2025 at -18.0°S 129.0°E

Download data: JSON

Event type: Cold spell

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

  • Australia

Duration: 5 days

Time span: September 21 2025 to September 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.0 °C
  • Mean temperature: 24.5 °C
  • Minimum temperature anomaly: -5.1 °C
  • Minimum temperature: 22.2 °C

Event center: -18.0°S 129.0°E

Area affected: 184640 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-25_129.0_-18.0

Cold spell occuring from September 21 2025 to September 23 2025 at 34.5°N 110.5°E

Download data: JSON

Event type: Cold spell

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

  • China

Duration: 3 days

Time span: September 21 2025 to September 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.5 °C
  • Mean temperature: 13.7 °C
  • Minimum temperature anomaly: -6.2 °C
  • Minimum temperature: 9.6 °C

Event center: 34.5°N 110.5°E

Area affected: 101889 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-23_110.5_34.5

Cold spell occuring from September 21 2025 to September 29 2025 at -65.0°S 98.5°E

Download data: JSON

Event type: Cold spell

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

  • Antarctica

Duration: 9 days

Time span: September 21 2025 to September 29 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.7 °C
  • Mean temperature: -16.5 °C
  • Minimum temperature anomaly: -10.9 °C
  • Minimum temperature: -23.8 °C

Event center: -65.0°S 98.5°E

Area affected: 667069 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-29_98.5_-65.0

Cold spell occuring from September 20 2025 to September 27 2025 at 67.5°N 133.5°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation

Duration: 8 days

Time span: September 20 2025 to September 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.1 °C
  • Mean temperature: -5.2 °C
  • Minimum temperature anomaly: -8.3 °C
  • Minimum temperature: -12.6 °C

Event center: 67.5°N 133.5°E

Area affected: 86891 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-20_to_2025-Sep-27_133.5_67.5

Cold spell occuring from September 20 2025 to September 24 2025 at 53.5°N 351.0°E

Download data: JSON

Event type: Cold spell

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

  • Ireland

Duration: 5 days

Time span: September 20 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.4 °C
  • Mean temperature: 9.3 °C
  • Minimum temperature anomaly: -4.8 °C
  • Minimum temperature: 7.6 °C

Event center: 53.5°N 351.0°E

Area affected: 52384 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-20_to_2025-Sep-24_351.0_53.5

Heat wave occuring from September 20 2025 to September 24 2025 at -33.5°S 172.5°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 5 days

Time span: September 20 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.9 °C
  • Mean temperature: 17.1 °C
  • Maximum temperature anomaly: 5.1 °C
  • Maximum temperature: 20.3 °C

Event center: -33.5°S 172.5°E

Area affected: 496412 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-20_to_2025-Sep-24_172.5_-33.5

Heat wave occuring from September 19 2025 to September 23 2025 at -53.0°S 176.0°E

Download data: JSON

Event type: Heat wave

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

  • New Zealand

Duration: 5 days

Time span: September 19 2025 to September 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.3 °C
  • Mean temperature: 8.3 °C
  • Maximum temperature anomaly: 4.4 °C
  • Maximum temperature: 12.6 °C

Event center: -53.0°S 176.0°E

Area affected: 962415 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-19_to_2025-Sep-23_176.0_-53.0

Heat wave occuring from September 19 2025 to September 21 2025 at -21.5°S 301.0°E

Download data: JSON

Event type: Heat wave

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

  • Bolivia, Plurinational State of
  • Brazil
  • Paraguay

Duration: 3 days

Time span: September 19 2025 to September 21 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.1 °C
  • Mean temperature: 32.5 °C
  • Maximum temperature anomaly: 7.8 °C
  • Maximum temperature: 34.0 °C

Event center: -21.5°S 301.0°E

Area affected: 75383 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-19_to_2025-Sep-21_301.0_-21.5

Cold spell occuring from September 19 2025 to September 27 2025 at 32.0°N 44.5°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
  • Iraq
  • Kuwait
  • Russian Federation
  • Saudi Arabia
  • Turkmenistan
  • Türkiye

Duration: 9 days

Time span: September 19 2025 to September 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.1 °C
  • Mean temperature: 19.8 °C
  • Minimum temperature anomaly: -9.4 °C
  • Minimum temperature: 0.2 °C

Event center: 32.0°N 44.5°E

Area affected: 913134 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-19_to_2025-Sep-27_44.5_32.0

Cold spell occuring from September 19 2025 to September 24 2025 at 15.0°N 30.5°E

Download data: JSON

Event type: Cold spell

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

  • Sudan

Duration: 6 days

Time span: September 19 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.4 °C
  • Mean temperature: 27.9 °C
  • Minimum temperature anomaly: -4.4 °C
  • Minimum temperature: 24.9 °C

Event center: 15.0°N 30.5°E

Area affected: 137790 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-19_to_2025-Sep-24_30.5_15.0