Category: Heat waves affecting Canada

Heat wave occuring from May 27 2025 to May 29 2025 at 54.0°N 286.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 3 days

Time span: May 27 2025 to May 29 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 10.3 °C
  • Mean temperature: 15.9 °C
  • Maximum temperature anomaly: 12.6 °C
  • Maximum temperature: 19.1 °C

Event center: 54.0°N 286.5°E

Area affected: 64353 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-May-27_to_2025-May-29_286.5_54.0

Heat wave occuring from May 25 2025 to June 13 2025 at 48.0°N 306.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 20 days

Time span: May 25 2025 to June 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.6 °C
  • Mean temperature: 13.1 °C
  • Maximum temperature anomaly: 11.9 °C
  • Maximum temperature: 22.5 °C

Event center: 48.0°N 306.5°E

Area affected: 1440554 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-May-25_to_2025-Jun-13_306.5_48.0

Heat wave occuring from May 23 2025 to May 27 2025 at 67.5°N 294.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 5 days

Time span: May 23 2025 to May 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.2 °C
  • Mean temperature: -0.8 °C
  • Maximum temperature anomaly: 7.5 °C
  • Maximum temperature: 1.7 °C

Event center: 67.5°N 294.5°E

Area affected: 54255 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-May-23_to_2025-May-27_294.5_67.5

Heat wave occuring from May 18 2025 to June 09 2025 at 66.5°N 271.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 23 days

Time span: May 18 2025 to June 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.5 °C
  • Mean temperature: 7.2 °C
  • Maximum temperature anomaly: 18.9 °C
  • Maximum temperature: 34.8 °C

Event center: 66.5°N 271.5°E

Area affected: 6801025 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-May-18_to_2025-Jun-09_271.5_66.5

Heat wave occuring from May 08 2025 to May 17 2025 at 47.5°N 259.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • Mexico
  • United States

Duration: 10 days

Time span: May 08 2025 to May 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 9.3 °C
  • Mean temperature: 20.0 °C
  • Maximum temperature anomaly: 19.9 °C
  • Maximum temperature: 33.6 °C

Event center: 47.5°N 259.0°E

Area affected: 3663517 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-May-08_to_2025-May-17_259.0_47.5

Heat wave occuring from May 04 2025 to May 06 2025 at 49.5°N 264.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 3 days

Time span: May 04 2025 to May 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 7.6 °C
  • Mean temperature: 17.4 °C
  • Maximum temperature anomaly: 12.9 °C
  • Maximum temperature: 22.3 °C

Event center: 49.5°N 264.5°E

Area affected: 81073 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-May-04_to_2025-May-06_264.5_49.5

Heat wave occuring from May 03 2025 to May 05 2025 at 52.0°N 257.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 3 days

Time span: May 03 2025 to May 05 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 8.5 °C
  • Mean temperature: 16.5 °C
  • Maximum temperature anomaly: 13.9 °C
  • Maximum temperature: 22.2 °C

Event center: 52.0°N 257.5°E

Area affected: 89710 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-May-03_to_2025-May-05_257.5_52.0

Heat wave occuring from May 02 2025 to May 04 2025 at 53.5°N 250.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 3 days

Time span: May 02 2025 to May 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 8.3 °C
  • Mean temperature: 15.9 °C
  • Maximum temperature anomaly: 11.7 °C
  • Maximum temperature: 19.7 °C

Event center: 53.5°N 250.0°E

Area affected: 104611 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-May-02_to_2025-May-04_250.0_53.5

Heat wave occuring from April 29 2025 to May 03 2025 at 56.5°N 237.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 5 days

Time span: April 29 2025 to May 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.8 °C
  • Mean temperature: 10.0 °C
  • Maximum temperature anomaly: 9.4 °C
  • Maximum temperature: 17.0 °C

Event center: 56.5°N 237.0°E

Area affected: 133717 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-Apr-29_to_2025-May-03_237.0_56.5

Heat wave occuring from April 27 2025 to April 30 2025 at 48.5°N 291.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 4 days

Time span: April 27 2025 to April 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.5 °C
  • Mean temperature: 5.5 °C
  • Maximum temperature anomaly: 6.7 °C
  • Maximum temperature: 10.7 °C

Event center: 48.5°N 291.0°E

Area affected: 135602 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-Apr-27_to_2025-Apr-30_291.0_48.5