Category: Extremes affecting United States

Download data: JSON

Event type: Heat wave

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

• United States

Duration: 7 days

Time span: October 31 2025 to November 06 2025

Statistics over entire affected area:

• Mean temperature anomaly: 6.2 °C
• Mean temperature: 11.9 °C
• Maximum temperature anomaly: 9.7 °C
• Maximum temperature: 22.1 °C

Event center: 39.0°N 248.5°E

Area affected: 313611 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-Oct-31_to_2025-Nov-06_248.5_39.0

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: October 16 2025 to October 19 2025

Statistics over entire affected area:

• Mean temperature anomaly: 5.4 °C
• Mean temperature: 22.7 °C
• Maximum temperature anomaly: 7.1 °C
• Maximum temperature: 25.2 °C

Event center: 34.0°N 272.5°E

Area affected: 92959 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-Oct-16_to_2025-Oct-19_272.5_34.0

Download data: JSON

Event type: Heat wave

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

• United States

Duration: 7 days

Time span: October 12 2025 to October 18 2025

Statistics over entire affected area:

• Mean temperature anomaly: 6.3 °C
• Mean temperature: 2.8 °C
• Maximum temperature anomaly: 10.1 °C
• Maximum temperature: 7.6 °C

Event center: 64.5°N 212.0°E

Area affected: 104328 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-Oct-12_to_2025-Oct-18_212.0_64.5

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: October 09 2025 to October 11 2025

Statistics over entire affected area:

• Mean temperature anomaly: 6.1 °C
• Mean temperature: 13.8 °C
• Maximum temperature anomaly: 7.8 °C
• Maximum temperature: 18.9 °C

Event center: 41.0°N 248.0°E

Area affected: 51353 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-Oct-09_to_2025-Oct-11_248.0_41.0

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: October 07 2025 to October 09 2025

Statistics over entire affected area:

• Mean temperature anomaly: 2.4 °C
• Mean temperature: 10.6 °C
• Maximum temperature anomaly: 4.3 °C
• Maximum temperature: 11.3 °C

Event center: 56.0°N 203.5°E

Area affected: 64436 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-Oct-07_to_2025-Oct-09_203.5_56.0

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: October 05 2025 to October 09 2025

Statistics over entire affected area:

• Mean temperature anomaly: 5.3 °C
• Mean temperature: 6.2 °C
• Maximum temperature anomaly: 8.3 °C
• Maximum temperature: 9.7 °C

Event center: 64.5°N 198.5°E

Area affected: 61494 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-Oct-05_to_2025-Oct-09_198.5_64.5