Category: Extremes affecting United States

Cold spell occuring from July 12 2025 to July 15 2025 at 31.5°N 260.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 4 days

Time span: July 12 2025 to July 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.7 °C
  • Mean temperature: 25.2 °C
  • Minimum temperature anomaly: -5.3 °C
  • Minimum temperature: 23.8 °C

Event center: 31.5°N 260.0°E

Area affected: 94982 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-12_to_2025-Jul-15_260.0_31.5

Heat wave occuring from July 11 2025 to July 18 2025 at 37.5°N 279.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 8 days

Time span: July 11 2025 to July 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.8 °C
  • Mean temperature: 26.4 °C
  • Maximum temperature anomaly: 4.4 °C
  • Maximum temperature: 29.8 °C

Event center: 37.5°N 279.5°E

Area affected: 109678 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-Jul-11_to_2025-Jul-18_279.5_37.5

Heat wave occuring from July 11 2025 to July 18 2025 at 48.0°N 237.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 8 days

Time span: July 11 2025 to July 18 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.7 °C
  • Mean temperature: 26.2 °C
  • Maximum temperature anomaly: 7.3 °C
  • Maximum temperature: 34.4 °C

Event center: 48.0°N 237.5°E

Area affected: 338943 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-Jul-11_to_2025-Jul-18_237.5_48.0

Heat wave occuring from July 11 2025 to July 20 2025 at 44.0°N 293.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 10 days

Time span: July 11 2025 to July 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.2 °C
  • Mean temperature: 22.6 °C
  • Maximum temperature anomaly: 6.4 °C
  • Maximum temperature: 27.9 °C

Event center: 44.0°N 293.0°E

Area affected: 242835 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-Jul-11_to_2025-Jul-20_293.0_44.0

Heat wave occuring from July 08 2025 to July 16 2025 at 30.0°N 273.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 9 days

Time span: July 08 2025 to July 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.5 °C
  • Mean temperature: 29.3 °C
  • Maximum temperature anomaly: 3.5 °C
  • Maximum temperature: 31.0 °C

Event center: 30.0°N 273.0°E

Area affected: 203318 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-Jul-08_to_2025-Jul-16_273.0_30.0

Heat wave occuring from July 05 2025 to July 15 2025 at 33.0°N 251.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 11 days

Time span: July 05 2025 to July 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.0 °C
  • Mean temperature: 29.4 °C
  • Maximum temperature anomaly: 6.1 °C
  • Maximum temperature: 39.9 °C

Event center: 33.0°N 251.5°E

Area affected: 202925 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-Jul-05_to_2025-Jul-15_251.5_33.0

Cold spell occuring from July 05 2025 to July 12 2025 at 71.0°N 196.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 8 days

Time span: July 05 2025 to July 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.5 °C
  • Mean temperature: 1.8 °C
  • Minimum temperature anomaly: -11.4 °C
  • Minimum temperature: -2.3 °C

Event center: 71.0°N 196.0°E

Area affected: 216944 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-05_to_2025-Jul-12_196.0_71.0

Heat wave occuring from July 03 2025 to July 09 2025 at 36.0°N 276.5°E

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: July 03 2025 to July 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.2 °C
  • Mean temperature: 27.1 °C
  • Maximum temperature anomaly: 5.0 °C
  • Maximum temperature: 29.7 °C

Event center: 36.0°N 276.5°E

Area affected: 54657 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-Jul-03_to_2025-Jul-09_276.5_36.0

Heat wave occuring from July 01 2025 to July 04 2025 at 49.0°N 258.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 4 days

Time span: July 01 2025 to July 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.9 °C
  • Mean temperature: 26.3 °C
  • Maximum temperature anomaly: 8.9 °C
  • Maximum temperature: 30.4 °C

Event center: 49.0°N 258.0°E

Area affected: 169452 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-Jul-01_to_2025-Jul-04_258.0_49.0

Heat wave occuring from July 01 2025 to July 03 2025 at 50.5°N 252.5°E

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: July 01 2025 to July 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.7 °C
  • Mean temperature: 22.8 °C
  • Maximum temperature anomaly: 8.6 °C
  • Maximum temperature: 26.4 °C

Event center: 50.5°N 252.5°E

Area affected: 120143 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-Jul-01_to_2025-Jul-03_252.5_50.5