Category: Extremes affecting Canada

Heat wave occuring from June 15 2025 to June 19 2025 at 46.5°N 246.0°E

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: June 15 2025 to June 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.1 °C
  • Mean temperature: 18.3 °C
  • Maximum temperature anomaly: 6.3 °C
  • Maximum temperature: 21.5 °C

Event center: 46.5°N 246.0°E

Area affected: 53628 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-Jun-15_to_2025-Jun-19_246.0_46.5

Cold spell occuring from June 12 2025 to June 14 2025 at 49.0°N 278.0°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: June 12 2025 to June 14 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.7 °C
  • Mean temperature: 9.0 °C
  • Minimum temperature anomaly: -9.3 °C
  • Minimum temperature: 6.1 °C

Event center: 49.0°N 278.0°E

Area affected: 109408 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-12_to_2025-Jun-14_278.0_49.0

Cold spell occuring from June 11 2025 to June 22 2025 at 68.5°N 293.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada

Duration: 12 days

Time span: June 11 2025 to June 22 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.9 °C
  • Mean temperature: -1.5 °C
  • Minimum temperature anomaly: -5.3 °C
  • Minimum temperature: -5.9 °C

Event center: 68.5°N 293.0°E

Area affected: 70674 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-11_to_2025-Jun-22_293.0_68.5

Heat wave occuring from June 11 2025 to June 13 2025 at 44.5°N 298.5°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: June 11 2025 to June 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.3 °C
  • Mean temperature: 12.0 °C
  • Maximum temperature anomaly: 3.6 °C
  • Maximum temperature: 14.5 °C

Event center: 44.5°N 298.5°E

Area affected: 59237 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-Jun-11_to_2025-Jun-13_298.5_44.5

Heat wave occuring from June 10 2025 to June 24 2025 at 72.0°N 200.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 15 days

Time span: June 10 2025 to June 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.5 °C
  • Mean temperature: 9.8 °C
  • Maximum temperature anomaly: 10.2 °C
  • Maximum temperature: 24.6 °C

Event center: 72.0°N 200.0°E

Area affected: 1758757 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-Jun-10_to_2025-Jun-24_200.0_72.0

Cold spell occuring from June 09 2025 to June 17 2025 at 48.0°N 274.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 9 days

Time span: June 09 2025 to June 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.9 °C
  • Mean temperature: 7.9 °C
  • Minimum temperature anomaly: -8.1 °C
  • Minimum temperature: 2.9 °C

Event center: 48.0°N 274.0°E

Area affected: 147414 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-09_to_2025-Jun-17_274.0_48.0

Cold spell occuring from June 09 2025 to June 12 2025 at 55.0°N 262.5°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: June 09 2025 to June 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.2 °C
  • Mean temperature: 5.5 °C
  • Minimum temperature anomaly: -11.0 °C
  • Minimum temperature: 1.5 °C

Event center: 55.0°N 262.5°E

Area affected: 185149 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-09_to_2025-Jun-12_262.5_55.0

Heat wave occuring from June 08 2025 to June 11 2025 at 70.0°N 258.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 4 days

Time span: June 08 2025 to June 11 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.2 °C
  • Mean temperature: 5.8 °C
  • Maximum temperature anomaly: 7.5 °C
  • Maximum temperature: 8.4 °C

Event center: 70.0°N 258.5°E

Area affected: 58379 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-Jun-08_to_2025-Jun-11_258.5_70.0

Heat wave occuring from June 08 2025 to June 10 2025 at 57.0°N 283.0°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: June 08 2025 to June 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.2 °C
  • Mean temperature: 2.9 °C
  • Maximum temperature anomaly: 6.1 °C
  • Maximum temperature: 8.5 °C

Event center: 57.0°N 283.0°E

Area affected: 74059 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-Jun-08_to_2025-Jun-10_283.0_57.0

Cold spell occuring from June 05 2025 to June 18 2025 at 41.5°N 235.0°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: June 05 2025 to June 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.9 °C
  • Mean temperature: 11.2 °C
  • Minimum temperature anomaly: -3.9 °C
  • Minimum temperature: 8.4 °C

Event center: 41.5°N 235.0°E

Area affected: 209538 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-05_to_2025-Jun-18_235.0_41.5