Category: Cold spells affecting Canada

Cold spell occuring from November 08 2025 to November 10 2025 at 49.0°N 278.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 3 days

Time span: November 08 2025 to November 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.7 °C
  • Mean temperature: -7.6 °C
  • Minimum temperature anomaly: -10.3 °C
  • Minimum temperature: -12.2 °C

Event center: 49.0°N 278.5°E

Area affected: 98237 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-Nov-08_to_2025-Nov-10_278.5_49.0

Cold spell occuring from September 02 2025 to September 11 2025 at 50.0°N 271.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 10 days

Time span: September 02 2025 to September 11 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.4 °C
  • Mean temperature: 11.8 °C
  • Minimum temperature anomaly: -12.0 °C
  • Minimum temperature: 2.2 °C

Event center: 50.0°N 271.5°E

Area affected: 3797296 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-02_to_2025-Sep-11_271.5_50.0

Cold spell occuring from August 29 2025 to September 08 2025 at 72.0°N 282.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 11 days

Time span: August 29 2025 to September 08 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.2 °C
  • Mean temperature: -3.6 °C
  • Minimum temperature anomaly: -7.9 °C
  • Minimum temperature: -14.0 °C

Event center: 72.0°N 282.5°E

Area affected: 82951 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-29_to_2025-Sep-08_282.5_72.0

Cold spell occuring from August 26 2025 to September 01 2025 at 75.0°N 240.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 7 days

Time span: August 26 2025 to September 01 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.0 °C
  • Mean temperature: -3.3 °C
  • Minimum temperature anomaly: -5.9 °C
  • Minimum temperature: -5.1 °C

Event center: 75.0°N 240.5°E

Area affected: 89538 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-26_to_2025-Sep-01_240.5_75.0

Cold spell occuring from August 23 2025 to August 25 2025 at 48.0°N 256.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 3 days

Time span: August 23 2025 to August 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.7 °C
  • Mean temperature: 14.2 °C
  • Minimum temperature anomaly: -7.5 °C
  • Minimum temperature: 11.9 °C

Event center: 48.0°N 256.5°E

Area affected: 108403 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-23_to_2025-Aug-25_256.5_48.0

Cold spell occuring from August 23 2025 to August 25 2025 at 48.0°N 265.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 3 days

Time span: August 23 2025 to August 25 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.0 °C
  • Mean temperature: 13.1 °C
  • Minimum temperature anomaly: -6.9 °C
  • Minimum temperature: 11.2 °C

Event center: 48.0°N 265.0°E

Area affected: 82023 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-23_to_2025-Aug-25_265.0_48.0

Cold spell occuring from August 22 2025 to September 04 2025 at 39.0°N 292.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 14 days

Time span: August 22 2025 to September 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.4 °C
  • Mean temperature: 18.9 °C
  • Minimum temperature anomaly: -9.9 °C
  • Minimum temperature: 8.9 °C

Event center: 39.0°N 292.0°E

Area affected: 4178135 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-22_to_2025-Sep-04_292.0_39.0

Cold spell occuring from August 19 2025 to September 01 2025 at 81.0°N 202.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 14 days

Time span: August 19 2025 to September 01 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.2 °C
  • Mean temperature: -3.2 °C
  • Minimum temperature anomaly: -5.5 °C
  • Minimum temperature: -6.5 °C

Event center: 81.0°N 202.5°E

Area affected: 1001289 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-19_to_2025-Sep-01_202.5_81.0

Cold spell occuring from August 18 2025 to August 20 2025 at 50.5°N 291.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 3 days

Time span: August 18 2025 to August 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.3 °C
  • Mean temperature: 11.5 °C
  • Minimum temperature anomaly: -6.7 °C
  • Minimum temperature: 6.4 °C

Event center: 50.5°N 291.5°E

Area affected: 168811 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-18_to_2025-Aug-20_291.5_50.5

Cold spell occuring from August 17 2025 to August 20 2025 at 50.5°N 290.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 4 days

Time span: August 17 2025 to August 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.0 °C
  • Mean temperature: 8.5 °C
  • Minimum temperature anomaly: -7.0 °C
  • Minimum temperature: 5.5 °C

Event center: 50.5°N 290.5°E

Area affected: 111012 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-17_to_2025-Aug-20_290.5_50.5