Category: Heat waves affecting Canada

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: July 19 2025 to July 23 2025

Statistics over entire affected area:

• Mean temperature anomaly: 4.2 °C
• Mean temperature: 15.6 °C
• Maximum temperature anomaly: 6.5 °C
• Maximum temperature: 19.8 °C

Event center: 58.0°N 229.0°E

Area affected: 97936 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-Jul-19_to_2025-Jul-23_229.0_58.0

Download data: JSON

Event type: Heat wave

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

• Canada
• United States

Duration: 7 days

Time span: July 17 2025 to July 23 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.8 °C
• Mean temperature: 15.6 °C
• Maximum temperature anomaly: 6.9 °C
• Maximum temperature: 20.3 °C

Event center: 60.0°N 225.5°E

Area affected: 143988 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-Jul-17_to_2025-Jul-23_225.5_60.0

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: July 15 2025 to July 17 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.9 °C
• Mean temperature: 16.5 °C
• Maximum temperature anomaly: 6.0 °C
• Maximum temperature: 19.4 °C

Event center: 53.5°N 231.5°E

Area affected: 52308 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-Jul-15_to_2025-Jul-17_231.5_53.5

Download data: JSON

Event type: Heat wave

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

• Canada
• United States

Duration: 10 days

Time span: July 11 2025 to July 20 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.2 °C
• Mean temperature: 22.6 °C
• Maximum temperature anomaly: 6.4 °C
• Maximum temperature: 27.9 °C

Event center: 44.0°N 293.0°E

Area affected: 242835 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-Jul-11_to_2025-Jul-20_293.0_44.0

Download data: JSON

Event type: Heat wave

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

• Canada
• United States

Duration: 4 days

Time span: July 01 2025 to July 04 2025

Statistics over entire affected area:

• Mean temperature anomaly: 5.9 °C
• Mean temperature: 26.3 °C
• Maximum temperature anomaly: 8.9 °C
• Maximum temperature: 30.4 °C

Event center: 49.0°N 258.0°E

Area affected: 169452 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-Jul-01_to_2025-Jul-04_258.0_49.0

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: July 01 2025 to July 03 2025

Statistics over entire affected area:

• Mean temperature anomaly: 5.7 °C
• Mean temperature: 22.8 °C
• Maximum temperature anomaly: 8.6 °C
• Maximum temperature: 26.4 °C

Event center: 50.5°N 252.5°E

Area affected: 120143 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-Jul-01_to_2025-Jul-03_252.5_50.5