Category: Extremes affecting United States

Cold spell occuring from April 26 2025 to April 28 2025 at 35.0°N 242.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 3 days

Time span: April 26 2025 to April 28 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.4 °C
  • Mean temperature: 13.9 °C
  • Minimum temperature anomaly: -8.9 °C
  • Minimum temperature: 6.7 °C

Event center: 35.0°N 242.0°E

Area affected: 58641 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-Apr-26_to_2025-Apr-28_242.0_35.0

Heat wave occuring from April 25 2025 to April 30 2025 at 41.5°N 289.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 6 days

Time span: April 25 2025 to April 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.9 °C
  • Mean temperature: 12.3 °C
  • Maximum temperature anomaly: 7.4 °C
  • Maximum temperature: 18.4 °C

Event center: 41.5°N 289.5°E

Area affected: 92744 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-Apr-25_to_2025-Apr-30_289.5_41.5

Heat wave occuring from April 20 2025 to April 30 2025 at 19.5°N 260.5°E

Download data: JSON

Event type: Heat wave

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

  • Mexico
  • United States

Duration: 11 days

Time span: April 20 2025 to April 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.0 °C
  • Mean temperature: 24.8 °C
  • Maximum temperature anomaly: 8.5 °C
  • Maximum temperature: 31.8 °C

Event center: 19.5°N 260.5°E

Area affected: 353198 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-Apr-20_to_2025-Apr-30_260.5_19.5

Cold spell occuring from April 18 2025 to May 23 2025 at 19.5°N 247.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 36 days

Time span: April 18 2025 to May 23 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.0 °C
  • Mean temperature: 20.7 °C
  • Minimum temperature anomaly: -8.5 °C
  • Minimum temperature: 8.3 °C

Event center: 19.5°N 247.0°E

Area affected: 1989074 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-Apr-18_to_2025-May-23_247.0_19.5

Heat wave occuring from April 17 2025 to May 09 2025 at 32.5°N 274.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 23 days

Time span: April 17 2025 to May 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 4.8 °C
  • Mean temperature: 22.9 °C
  • Maximum temperature anomaly: 11.7 °C
  • Maximum temperature: 26.9 °C

Event center: 32.5°N 274.0°E

Area affected: 1605911 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-Apr-17_to_2025-May-09_274.0_32.5

Heat wave occuring from April 14 2025 to April 19 2025 at 42.0°N 236.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 6 days

Time span: April 14 2025 to April 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.5 °C
  • Mean temperature: 12.2 °C
  • Maximum temperature anomaly: 8.7 °C
  • Maximum temperature: 16.7 °C

Event center: 42.0°N 236.0°E

Area affected: 81167 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-Apr-14_to_2025-Apr-19_236.0_42.0

Cold spell occuring from April 07 2025 to April 12 2025 at 62.0°N 202.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 6 days

Time span: April 07 2025 to April 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -9.0 °C
  • Mean temperature: -17.5 °C
  • Minimum temperature anomaly: -13.9 °C
  • Minimum temperature: -26.1 °C

Event center: 62.0°N 202.0°E

Area affected: 373147 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-Apr-07_to_2025-Apr-12_202.0_62.0

Heat wave occuring from April 07 2025 to April 19 2025 at 26.5°N 252.0°E

Download data: JSON

Event type: Heat wave

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

  • Mexico
  • United States

Duration: 13 days

Time span: April 07 2025 to April 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.0 °C
  • Mean temperature: 20.8 °C
  • Maximum temperature anomaly: 12.3 °C
  • Maximum temperature: 30.5 °C

Event center: 26.5°N 252.0°E

Area affected: 2429411 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-Apr-07_to_2025-Apr-19_252.0_26.5

Cold spell occuring from April 02 2025 to April 06 2025 at 37.0°N 253.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 5 days

Time span: April 02 2025 to April 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -6.3 °C
  • Mean temperature: -6.7 °C
  • Minimum temperature anomaly: -9.1 °C
  • Minimum temperature: -11.3 °C

Event center: 37.0°N 253.5°E

Area affected: 104923 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-Apr-02_to_2025-Apr-06_253.5_37.0

Heat wave occuring from March 29 2025 to March 31 2025 at 39.0°N 283.5°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 29 2025 to March 31 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 8.0 °C
  • Mean temperature: 18.0 °C
  • Maximum temperature anomaly: 11.4 °C
  • Maximum temperature: 23.1 °C

Event center: 39.0°N 283.5°E

Area affected: 390913 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-29_to_2025-Mar-31_283.5_39.0