Category: Extremes affecting Canada

Download data: JSON

Event type: Heat wave

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

• Canada

Duration: 6 days

Time span: September 10 2025 to September 15 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.4 °C
• Mean temperature: -1.7 °C
• Maximum temperature anomaly: 4.3 °C
• Maximum temperature: -0.8 °C

Event center: 89.0°N 174.0°E

Area affected: 105162 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-10_to_2025-Sep-15_174.0_89.0

Download data: JSON

Event type: Heat wave

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

• Canada

Duration: 5 days

Time span: September 09 2025 to September 13 2025

Statistics over entire affected area:

• Mean temperature anomaly: 6.4 °C
• Mean temperature: 9.1 °C
• Maximum temperature anomaly: 9.7 °C
• Maximum temperature: 12.8 °C

Event center: 68.5°N 243.5°E

Area affected: 79542 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-09_to_2025-Sep-13_243.5_68.5

Download data: JSON

Event type: Heat wave

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

• Canada

Duration: 9 days

Time span: September 04 2025 to September 12 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.6 °C
• Mean temperature: -2.3 °C
• Maximum temperature anomaly: 7.5 °C
• Maximum temperature: 0.0 °C

Event center: 83.0°N 281.0°E

Area affected: 296849 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-04_to_2025-Sep-12_281.0_83.0

Download data: JSON

Event type: Heat wave

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

• Canada

Duration: 8 days

Time span: September 01 2025 to September 08 2025

Statistics over entire affected area:

• Mean temperature anomaly: 4.8 °C
• Mean temperature: 17.1 °C
• Maximum temperature anomaly: 9.6 °C
• Maximum temperature: 21.0 °C

Event center: 50.0°N 297.5°E

Area affected: 499032 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-01_to_2025-Sep-08_297.5_50.0