Category: Extremes affecting Canada

Download data: JSON

Event type: Cold spell

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

• Canada

Duration: 13 days

Time span: August 08 2025 to August 20 2025

Statistics over entire affected area:

• Mean temperature anomaly: -3.9 °C
• Mean temperature: 3.6 °C
• Minimum temperature anomaly: -6.3 °C
• Minimum temperature: -0.8 °C

Event center: 64.0°N 290.0°E

Area affected: 84076 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-Aug-08_to_2025-Aug-20_290.0_64.0

Download data: JSON

Event type: Cold spell

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

• Canada

Duration: 9 days

Time span: August 01 2025 to August 09 2025

Statistics over entire affected area:

• Mean temperature anomaly: -2.8 °C
• Mean temperature: -0.1 °C
• Minimum temperature anomaly: -6.9 °C
• Minimum temperature: -9.9 °C

Event center: 77.5°N 259.0°E

Area affected: 152832 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-Aug-01_to_2025-Aug-09_259.0_77.5

Download data: JSON

Event type: Cold spell

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

• Canada

Duration: 15 days

Time span: August 01 2025 to August 15 2025

Statistics over entire affected area:

• Mean temperature anomaly: -2.5 °C
• Mean temperature: -0.2 °C
• Minimum temperature anomaly: -7.8 °C
• Minimum temperature: -3.3 °C

Event center: 74.5°N 249.0°E

Area affected: 1108097 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-Aug-01_to_2025-Aug-15_249.0_74.5

Download data: JSON

Event type: Cold spell

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

• Canada

Duration: 10 days

Time span: July 28 2025 to August 06 2025

Statistics over entire affected area:

• Mean temperature anomaly: -4.6 °C
• Mean temperature: 10.4 °C
• Minimum temperature anomaly: -8.2 °C
• Minimum temperature: 3.7 °C

Event center: 50.0°N 295.5°E

Area affected: 383934 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-Jul-28_to_2025-Aug-06_295.5_50.0

Download data: JSON

Event type: Cold spell

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

• Canada

Duration: 4 days

Time span: July 25 2025 to July 28 2025

Statistics over entire affected area:

• Mean temperature anomaly: -3.9 °C
• Mean temperature: 12.4 °C
• Minimum temperature anomaly: -5.4 °C
• Minimum temperature: 7.5 °C

Event center: 57.0°N 238.0°E

Area affected: 97032 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-Jul-25_to_2025-Jul-28_238.0_57.0

Download data: JSON

Event type: Cold spell

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

• Canada

Duration: 3 days

Time span: July 23 2025 to July 25 2025

Statistics over entire affected area:

• Mean temperature anomaly: -2.3 °C
• Mean temperature: 4.0 °C
• Minimum temperature anomaly: -3.3 °C
• Minimum temperature: 2.0 °C

Event center: 60.5°N 303.5°E

Area affected: 58937 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-Jul-23_to_2025-Jul-25_303.5_60.5