Author: WEXA

Heat wave occuring from September 30 2025 to October 06 2025 at 58.5°N 213.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 7 days

Time span: September 30 2025 to October 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.8 °C
  • Mean temperature: 11.4 °C
  • Maximum temperature anomaly: 2.4 °C
  • Maximum temperature: 12.1 °C

Event center: 58.5°N 213.0°E

Area affected: 50688 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-30_to_2025-Oct-06_213.0_58.5

Heat wave occuring from September 30 2025 to October 04 2025 at 39.0°N 96.0°E

Download data: JSON

Event type: Heat wave

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

  • China

Duration: 5 days

Time span: September 30 2025 to October 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.3 °C
  • Mean temperature: 5.0 °C
  • Maximum temperature anomaly: 7.9 °C
  • Maximum temperature: 19.8 °C

Event center: 39.0°N 96.0°E

Area affected: 82225 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-30_to_2025-Oct-04_96.0_39.0

Cold spell occuring from September 29 2025 to October 10 2025 at 40.5°N 17.5°E

Download data: JSON

Event type: Cold spell

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

  • Albania
  • Austria
  • Bosnia and Herzegovina
  • Bulgaria
  • Croatia
  • Czechia
  • France
  • Germany
  • Greece
  • Hungary
  • Italy
  • Moldova, Republic of
  • Montenegro
  • North Macedonia
  • Poland
  • Romania
  • Serbia
  • Slovakia
  • Slovenia
  • Ukraine

Duration: 12 days

Time span: September 29 2025 to October 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.1 °C
  • Mean temperature: 10.0 °C
  • Minimum temperature anomaly: -12.5 °C
  • Minimum temperature: -4.1 °C

Event center: 40.5°N 17.5°E

Area affected: 2031067 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-29_to_2025-Oct-10_17.5_40.5

Cold spell occuring from September 29 2025 to October 03 2025 at 60.0°N 33.5°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation

Duration: 5 days

Time span: September 29 2025 to October 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.6 °C
  • Mean temperature: 1.8 °C
  • Minimum temperature anomaly: -7.2 °C
  • Minimum temperature: -0.5 °C

Event center: 60.0°N 33.5°E

Area affected: 81552 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-29_to_2025-Oct-03_33.5_60.0

Heat wave occuring from September 28 2025 to October 03 2025 at 39.5°N 76.5°E

Download data: JSON

Event type: Heat wave

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

  • China

Duration: 6 days

Time span: September 28 2025 to October 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.6 °C
  • Mean temperature: 18.6 °C
  • Maximum temperature anomaly: 5.7 °C
  • Maximum temperature: 23.5 °C

Event center: 39.5°N 76.5°E

Area affected: 80380 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-28_to_2025-Oct-03_76.5_39.5

Cold spell occuring from September 28 2025 to October 02 2025 at 1.0°N 269.5°E

Download data: JSON

Event type: Cold spell

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

  • Ecuador

Duration: 5 days

Time span: September 28 2025 to October 02 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.5 °C
  • Mean temperature: 21.0 °C
  • Minimum temperature anomaly: -2.0 °C
  • Minimum temperature: 19.9 °C

Event center: 1.0°N 269.5°E

Area affected: 55628 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-28_to_2025-Oct-02_269.5_1.0

Heat wave occuring from September 28 2025 to October 08 2025 at 22.5°N 250.0°E

Download data: JSON

Event type: Heat wave

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

  • Mexico

Duration: 11 days

Time span: September 28 2025 to October 08 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.5 °C
  • Mean temperature: 28.9 °C
  • Maximum temperature anomaly: 2.0 °C
  • Maximum temperature: 30.7 °C

Event center: 22.5°N 250.0°E

Area affected: 214726 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-28_to_2025-Oct-08_250.0_22.5

Heat wave occuring from September 28 2025 to October 02 2025 at 28.0°N 266.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 5 days

Time span: September 28 2025 to October 02 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.9 °C
  • Mean temperature: 28.1 °C
  • Maximum temperature anomaly: 3.5 °C
  • Maximum temperature: 28.6 °C

Event center: 28.0°N 266.5°E

Area affected: 133067 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-28_to_2025-Oct-02_266.5_28.0

Heat wave occuring from September 27 2025 to October 01 2025 at 67.0°N 163.0°E

Download data: JSON

Event type: Heat wave

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

  • Russian Federation

Duration: 5 days

Time span: September 27 2025 to October 01 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.9 °C
  • Mean temperature: 3.1 °C
  • Maximum temperature anomaly: 7.6 °C
  • Maximum temperature: 6.8 °C

Event center: 67.0°N 163.0°E

Area affected: 243908 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-27_to_2025-Oct-01_163.0_67.0

Heat wave occuring from September 27 2025 to October 01 2025 at 65.0°N 330.0°E

Download data: JSON

Event type: Heat wave

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

  • Iceland

Duration: 5 days

Time span: September 27 2025 to October 01 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.3 °C
  • Mean temperature: 9.6 °C
  • Maximum temperature anomaly: 3.6 °C
  • Maximum temperature: 11.1 °C

Event center: 65.0°N 330.0°E

Area affected: 226468 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-27_to_2025-Oct-01_330.0_65.0