Author: WEXA

Cold spell occuring from September 19 2025 to September 23 2025 at 27.0°N 17.0°E

Download data: JSON

Event type: Cold spell

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

  • Libya

Duration: 5 days

Time span: September 19 2025 to September 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.7 °C
  • Mean temperature: 24.9 °C
  • Minimum temperature anomaly: -5.8 °C
  • Minimum temperature: 21.8 °C

Event center: 27.0°N 17.0°E

Area affected: 168950 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-23_17.0_27.0

Heat wave occuring from September 18 2025 to October 03 2025 at 0.0°N 32.0°E

Download data: JSON

Event type: Heat wave

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

  • Rwanda
  • Tanzania, United Republic of
  • Uganda

Duration: 16 days

Time span: September 18 2025 to October 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.6 °C
  • Mean temperature: 23.5 °C
  • Maximum temperature anomaly: 3.0 °C
  • Maximum temperature: 26.1 °C

Event center: 0.0°N 32.0°E

Area affected: 92720 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-18_to_2025-Oct-03_32.0_0.0

Heat wave occuring from September 18 2025 to September 22 2025 at -22.5°S 19.0°E

Download data: JSON

Event type: Heat wave

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

  • Botswana
  • Namibia

Duration: 5 days

Time span: September 18 2025 to September 22 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.9 °C
  • Mean temperature: 26.4 °C
  • Maximum temperature anomaly: 7.4 °C
  • Maximum temperature: 28.5 °C

Event center: -22.5°S 19.0°E

Area affected: 167647 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-18_to_2025-Sep-22_19.0_-22.5

Heat wave occuring from September 17 2025 to September 21 2025 at 48.5°N 245.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 5 days

Time span: September 17 2025 to September 21 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.0 °C
  • Mean temperature: 18.3 °C
  • Maximum temperature anomaly: 8.1 °C
  • Maximum temperature: 24.7 °C

Event center: 48.5°N 245.5°E

Area affected: 125336 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-17_to_2025-Sep-21_245.5_48.5

Heat wave occuring from September 17 2025 to September 25 2025 at 31.0°N 263.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 9 days

Time span: September 17 2025 to September 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.1 °C
  • Mean temperature: 29.9 °C
  • Maximum temperature anomaly: 6.0 °C
  • Maximum temperature: 31.3 °C

Event center: 31.0°N 263.5°E

Area affected: 80454 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-17_to_2025-Sep-25_263.5_31.0

Cold spell occuring from September 17 2025 to September 21 2025 at 64.5°N 343.0°E

Download data: JSON

Event type: Cold spell

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

  • Iceland

Duration: 5 days

Time span: September 17 2025 to September 21 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.9 °C
  • Mean temperature: 3.2 °C
  • Minimum temperature anomaly: -7.5 °C
  • Minimum temperature: -9.2 °C

Event center: 64.5°N 343.0°E

Area affected: 199773 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-17_to_2025-Sep-21_343.0_64.5

Cold spell occuring from September 17 2025 to September 19 2025 at 33.0°N 112.5°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 17 2025 to September 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.5 °C
  • Mean temperature: 13.7 °C
  • Minimum temperature anomaly: -8.2 °C
  • Minimum temperature: 8.8 °C

Event center: 33.0°N 112.5°E

Area affected: 112458 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-17_to_2025-Sep-19_112.5_33.0

Heat wave occuring from September 17 2025 to September 24 2025 at 71.0°N 307.0°E

Download data: JSON

Event type: Heat wave

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

  • Greenland

Duration: 8 days

Time span: September 17 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.3 °C
  • Mean temperature: 4.6 °C
  • Maximum temperature anomaly: 8.6 °C
  • Maximum temperature: 9.6 °C

Event center: 71.0°N 307.0°E

Area affected: 177623 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-17_to_2025-Sep-24_307.0_71.0

Cold spell occuring from September 15 2025 to October 03 2025 at 67.0°N 123.0°E

Download data: JSON

Event type: Cold spell

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

  • Kazakhstan
  • Russian Federation

Duration: 19 days

Time span: September 15 2025 to October 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.1 °C
  • Mean temperature: -3.7 °C
  • Minimum temperature anomaly: -15.6 °C
  • Minimum temperature: -17.4 °C

Event center: 67.0°N 123.0°E

Area affected: 3513090 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-15_to_2025-Oct-03_123.0_67.0

Cold spell occuring from September 14 2025 to September 24 2025 at -16.0°S 188.0°E

Download data: JSON

Event type: Cold spell

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

  • Samoa

Duration: 11 days

Time span: September 14 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.5 °C
  • Mean temperature: 23.6 °C
  • Minimum temperature anomaly: -2.7 °C
  • Minimum temperature: 19.3 °C

Event center: -16.0°S 188.0°E

Area affected: 944955 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-14_to_2025-Sep-24_188.0_-16.0