Category: Cold spells affecting United States

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: September 02 2025 to September 11 2025

Statistics over entire affected area:

• Mean temperature anomaly: -6.4 °C
• Mean temperature: 11.8 °C
• Minimum temperature anomaly: -12.0 °C
• Minimum temperature: 2.2 °C

Event center: 50.0°N 271.5°E

Area affected: 3797296 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-Sep-02_to_2025-Sep-11_271.5_50.0

Download data: JSON

Event type: Cold spell

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

• Canada
• United States

Duration: 3 days

Time span: August 23 2025 to August 25 2025

Statistics over entire affected area:

• Mean temperature anomaly: -5.7 °C
• Mean temperature: 14.2 °C
• Minimum temperature anomaly: -7.5 °C
• Minimum temperature: 11.9 °C

Event center: 48.0°N 256.5°E

Area affected: 108403 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-Aug-23_to_2025-Aug-25_256.5_48.0

Download data: JSON

Event type: Cold spell

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

• Canada
• United States

Duration: 3 days

Time span: August 23 2025 to August 25 2025

Statistics over entire affected area:

• Mean temperature anomaly: -5.0 °C
• Mean temperature: 13.1 °C
• Minimum temperature anomaly: -6.9 °C
• Minimum temperature: 11.2 °C

Event center: 48.0°N 265.0°E

Area affected: 82023 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-Aug-23_to_2025-Aug-25_265.0_48.0

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: August 22 2025 to September 04 2025

Statistics over entire affected area:

• Mean temperature anomaly: -4.4 °C
• Mean temperature: 18.9 °C
• Minimum temperature anomaly: -9.9 °C
• Minimum temperature: 8.9 °C

Event center: 39.0°N 292.0°E

Area affected: 4178135 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-Aug-22_to_2025-Sep-04_292.0_39.0

Download data: JSON

Event type: Cold spell

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

• Canada
• United States

Duration: 3 days

Time span: August 18 2025 to August 20 2025

Statistics over entire affected area:

• Mean temperature anomaly: -4.3 °C
• Mean temperature: 11.5 °C
• Minimum temperature anomaly: -6.7 °C
• Minimum temperature: 6.4 °C

Event center: 50.5°N 291.5°E

Area affected: 168811 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-Aug-18_to_2025-Aug-20_291.5_50.5

Download data: JSON

Event type: Cold spell

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

• Canada
• United States

Duration: 11 days

Time span: July 31 2025 to August 10 2025

Statistics over entire affected area:

• Mean temperature anomaly: -4.1 °C
• Mean temperature: 20.9 °C
• Minimum temperature anomaly: -7.8 °C
• Minimum temperature: 14.9 °C

Event center: 34.0°N 277.5°E

Area affected: 671087 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-Jul-31_to_2025-Aug-10_277.5_34.0