Category: Heat waves affecting United States

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

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

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

Download data: JSON

Event type: Heat wave

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

• Canada
• United States

Duration: 3 days

Time span: May 04 2025 to May 06 2025

Statistics over entire affected area:

• Mean temperature anomaly: 7.6 °C
• Mean temperature: 17.4 °C
• Maximum temperature anomaly: 12.9 °C
• Maximum temperature: 22.3 °C

Event center: 49.5°N 264.5°E

Area affected: 81073 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-04_to_2025-May-06_264.5_49.5

Download data: JSON

Event type: Heat wave

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

• Canada
• United States

Duration: 3 days

Time span: May 03 2025 to May 05 2025

Statistics over entire affected area:

• Mean temperature anomaly: 8.5 °C
• Mean temperature: 16.5 °C
• Maximum temperature anomaly: 13.9 °C
• Maximum temperature: 22.2 °C

Event center: 52.0°N 257.5°E

Area affected: 89710 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-03_to_2025-May-05_257.5_52.0

Download data: JSON

Event type: Heat wave

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

• Canada
• United States

Duration: 6 days

Time span: April 25 2025 to April 30 2025

Statistics over entire affected area:

• Mean temperature anomaly: 3.9 °C
• Mean temperature: 12.3 °C
• Maximum temperature anomaly: 7.4 °C
• Maximum temperature: 18.4 °C

Event center: 41.5°N 289.5°E

Area affected: 92744 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-Apr-25_to_2025-Apr-30_289.5_41.5