Category: Extremes affecting Canada

Cold spell occuring from June 03 2025 to June 21 2025 at 83.0°N 318.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • Greenland

Duration: 19 days

Time span: June 03 2025 to June 21 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.2 °C
  • Mean temperature: -8.1 °C
  • Minimum temperature anomaly: -9.8 °C
  • Minimum temperature: -21.3 °C

Event center: 83.0°N 318.0°E

Area affected: 1314490 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-Jun-03_to_2025-Jun-21_318.0_83.0

Cold spell occuring from May 27 2025 to June 12 2025 at 68.5°N 206.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • Russian Federation
  • United States

Duration: 17 days

Time span: May 27 2025 to June 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.9 °C
  • Mean temperature: -0.2 °C
  • Minimum temperature anomaly: -11.9 °C
  • Minimum temperature: -10.1 °C

Event center: 68.5°N 206.0°E

Area affected: 2053255 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-May-27_to_2025-Jun-12_206.0_68.5

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

Cold spell occuring from May 19 2025 to May 28 2025 at 44.0°N 286.5°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: May 19 2025 to May 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.8 °C
  • Mean temperature: 7.2 °C
  • Minimum temperature anomaly: -8.8 °C
  • Minimum temperature: 2.7 °C

Event center: 44.0°N 286.5°E

Area affected: 426842 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-May-19_to_2025-May-28_286.5_44.0

Cold spell occuring from May 18 2025 to May 20 2025 at 53.5°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: May 18 2025 to May 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.3 °C
  • Mean temperature: -1.9 °C
  • Minimum temperature anomaly: -10.6 °C
  • Minimum temperature: -5.0 °C

Event center: 53.5°N 278.5°E

Area affected: 94161 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-May-18_to_2025-May-20_278.5_53.5

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

Cold spell occuring from May 16 2025 to May 28 2025 at 47.0°N 258.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 13 days

Time span: May 16 2025 to May 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.3 °C
  • Mean temperature: 6.2 °C
  • Minimum temperature anomaly: -10.8 °C
  • Minimum temperature: 0.7 °C

Event center: 47.0°N 258.5°E

Area affected: 847874 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-May-16_to_2025-May-28_258.5_47.0

Cold spell occuring from May 15 2025 to May 18 2025 at 64.0°N 285.0°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: May 15 2025 to May 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.0 °C
  • Mean temperature: -8.8 °C
  • Minimum temperature anomaly: -7.1 °C
  • Minimum temperature: -11.7 °C

Event center: 64.0°N 285.0°E

Area affected: 171612 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-May-15_to_2025-May-18_285.0_64.0