Category: Heat waves affecting United States

Download data: JSON

Event type: Heat wave

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

• United States

Duration: 4 days

Time span: April 25 2026 to April 28 2026

Statistics over entire affected area:

• Mean temperature anomaly: 6.3 °C
• Mean temperature: 1.1 °C
• Maximum temperature anomaly: 7.6 °C
• Maximum temperature: 4.9 °C

Event center: 67.0°N 196.5°E

Area affected: 61284 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_2026-Apr-25_to_2026-Apr-28_196.5_67.0

Download data: JSON

Event type: Heat wave

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

• United States

Duration: 5 days

Time span: April 24 2026 to April 28 2026

Statistics over entire affected area:

• Mean temperature anomaly: 4.8 °C
• Mean temperature: 0.3 °C
• Maximum temperature anomaly: 7.4 °C
• Maximum temperature: 3.2 °C

Event center: 65.5°N 192.5°E

Area affected: 62396 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_2026-Apr-24_to_2026-Apr-28_192.5_65.5

Download data: JSON

Event type: Heat wave

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

• United States

Duration: 3 days

Time span: April 22 2026 to April 24 2026

Statistics over entire affected area:

• Mean temperature anomaly: 7.4 °C
• Mean temperature: 19.2 °C
• Maximum temperature anomaly: 12.6 °C
• Maximum temperature: 21.7 °C

Event center: 42.0°N 270.5°E

Area affected: 306428 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_2026-Apr-22_to_2026-Apr-24_270.5_42.0

Download data: JSON

Event type: Heat wave

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

• United States

Duration: 3 days

Time span: March 21 2026 to March 23 2026

Statistics over entire affected area:

• Mean temperature anomaly: 8.5 °C
• Mean temperature: 19.1 °C
• Maximum temperature anomaly: 12.6 °C
• Maximum temperature: 26.1 °C

Event center: 34.5°N 280.0°E

Area affected: 379806 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_2026-Mar-21_to_2026-Mar-23_280.0_34.5