Category: Extremes affecting United States

Heat wave occuring from March 27 2025 to March 30 2025 at 35.5°N 267.5°E

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: March 27 2025 to March 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 8.5 °C
  • Mean temperature: 18.9 °C
  • Maximum temperature anomaly: 12.6 °C
  • Maximum temperature: 22.7 °C

Event center: 35.5°N 267.5°E

Area affected: 281288 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-Mar-27_to_2025-Mar-30_267.5_35.5

Heat wave occuring from March 24 2025 to April 13 2025 at 56.5°N 227.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 21 days

Time span: March 24 2025 to April 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 7.4 °C
  • Mean temperature: -2.0 °C
  • Maximum temperature anomaly: 16.2 °C
  • Maximum temperature: 13.8 °C

Event center: 56.5°N 227.0°E

Area affected: 4563360 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-Mar-24_to_2025-Apr-13_227.0_56.5

Heat wave occuring from March 23 2025 to March 26 2025 at 29.5°N 260.0°E

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: March 23 2025 to March 26 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.9 °C
  • Mean temperature: 24.4 °C
  • Maximum temperature anomaly: 5.8 °C
  • Maximum temperature: 26.9 °C

Event center: 29.5°N 260.0°E

Area affected: 64868 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-Mar-23_to_2025-Mar-26_260.0_29.5

Heat wave occuring from March 23 2025 to March 29 2025 at 44.5°N 237.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • Mexico
  • United States

Duration: 7 days

Time span: March 23 2025 to March 29 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.7 °C
  • Mean temperature: 13.1 °C
  • Maximum temperature anomaly: 14.6 °C
  • Maximum temperature: 29.5 °C

Event center: 44.5°N 237.0°E

Area affected: 3459146 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-Mar-23_to_2025-Mar-29_237.0_44.5

Cold spell occuring from March 21 2025 to April 15 2025 at 13.0°N 242.0°E

Download data: JSON

Event type: Cold spell

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

  • Belize
  • El Salvador
  • Guatemala
  • Honduras
  • Mexico
  • Nicaragua
  • United States

Duration: 26 days

Time span: March 21 2025 to April 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.0 °C
  • Mean temperature: 19.5 °C
  • Minimum temperature anomaly: -15.0 °C
  • Minimum temperature: -6.7 °C

Event center: 13.0°N 242.0°E

Area affected: 4345856 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-Mar-21_to_2025-Apr-15_242.0_13.0

Cold spell occuring from March 18 2025 to March 28 2025 at 60.0°N 191.5°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation
  • United States

Duration: 11 days

Time span: March 18 2025 to March 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -9.0 °C
  • Mean temperature: -21.9 °C
  • Minimum temperature anomaly: -14.6 °C
  • Minimum temperature: -33.7 °C

Event center: 60.0°N 191.5°E

Area affected: 731065 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-Mar-18_to_2025-Mar-28_191.5_60.0

Heat wave occuring from March 15 2025 to March 26 2025 at 48.5°N 302.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 12 days

Time span: March 15 2025 to March 26 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.5 °C
  • Mean temperature: 4.0 °C
  • Maximum temperature anomaly: 16.3 °C
  • Maximum temperature: 14.0 °C

Event center: 48.5°N 302.0°E

Area affected: 1149057 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-Mar-15_to_2025-Mar-26_302.0_48.5

Heat wave occuring from March 08 2025 to March 10 2025 at 46.5°N 265.5°E

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 08 2025 to March 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 10.9 °C
  • Mean temperature: 5.1 °C
  • Maximum temperature anomaly: 13.8 °C
  • Maximum temperature: 10.5 °C

Event center: 46.5°N 265.5°E

Area affected: 136413 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-Mar-08_to_2025-Mar-10_265.5_46.5

Heat wave occuring from February 15 2025 to February 24 2025 at 59.5°N 216.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 10 days

Time span: February 15 2025 to February 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.4 °C
  • Mean temperature: 4.8 °C
  • Maximum temperature anomaly: 11.1 °C
  • Maximum temperature: 8.8 °C

Event center: 59.5°N 216.0°E

Area affected: 1021684 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-Feb-15_to_2025-Feb-24_216.0_59.5

Heat wave occuring from February 14 2025 to February 20 2025 at 54.5°N 160.5°E

Download data: JSON

Event type: Heat wave

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

  • Russian Federation
  • United States

Duration: 7 days

Time span: February 14 2025 to February 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.4 °C
  • Mean temperature: 1.2 °C
  • Maximum temperature anomaly: 13.0 °C
  • Maximum temperature: 3.1 °C

Event center: 54.5°N 160.5°E

Area affected: 683746 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-Feb-14_to_2025-Feb-20_160.5_54.5