Category: Extremes affecting United States

Cold spell occuring from April 23 2026 to April 30 2026 at 53.0°N 247.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 8 days

Time span: April 23 2026 to April 30 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -8.3 °C
  • Mean temperature: -2.9 °C
  • Minimum temperature anomaly: -16.2 °C
  • Minimum temperature: -10.5 °C

Event center: 53.0°N 247.5°E

Area affected: 1540760 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_2026-Apr-23_to_2026-Apr-30_247.5_53.0

Heat wave occuring from April 22 2026 to April 24 2026 at 42.0°N 270.5°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: April 22 2026 to April 24 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 7.4 °C
  • Mean temperature: 19.2 °C
  • Maximum temperature anomaly: 12.6 °C
  • Maximum temperature: 21.7 °C

Event center: 42.0°N 270.5°E

Area affected: 306428 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_2026-Apr-22_to_2026-Apr-24_270.5_42.0

Cold spell occuring from April 20 2026 to April 26 2026 at 39.0°N 295.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 7 days

Time span: April 20 2026 to April 26 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.3 °C
  • Mean temperature: -0.4 °C
  • Minimum temperature anomaly: -10.0 °C
  • Minimum temperature: -11.6 °C

Event center: 39.0°N 295.0°E

Area affected: 767580 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_2026-Apr-20_to_2026-Apr-26_295.0_39.0

Cold spell occuring from April 19 2026 to April 21 2026 at 27.5°N 259.5°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 19 2026 to April 21 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.9 °C
  • Mean temperature: 14.3 °C
  • Minimum temperature anomaly: -13.8 °C
  • Minimum temperature: 9.6 °C

Event center: 27.5°N 259.5°E

Area affected: 337099 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_2026-Apr-19_to_2026-Apr-21_259.5_27.5

Cold spell occuring from April 16 2026 to April 18 2026 at 44.0°N 244.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 3 days

Time span: April 16 2026 to April 18 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -5.6 °C
  • Mean temperature: -4.2 °C
  • Minimum temperature anomaly: -9.3 °C
  • Minimum temperature: -9.5 °C

Event center: 44.0°N 244.5°E

Area affected: 50037 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_2026-Apr-16_to_2026-Apr-18_244.5_44.0

Heat wave occuring from April 09 2026 to April 13 2026 at 50.5°N 238.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 5 days

Time span: April 09 2026 to April 13 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 4.6 °C
  • Mean temperature: 7.5 °C
  • Maximum temperature anomaly: 7.0 °C
  • Maximum temperature: 11.6 °C

Event center: 50.5°N 238.5°E

Area affected: 110848 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_2026-Apr-09_to_2026-Apr-13_238.5_50.5

Cold spell occuring from April 05 2026 to April 08 2026 at 26.0°N 258.5°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 4 days

Time span: April 05 2026 to April 08 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -6.6 °C
  • Mean temperature: 16.2 °C
  • Minimum temperature anomaly: -10.0 °C
  • Minimum temperature: 9.9 °C

Event center: 26.0°N 258.5°E

Area affected: 91627 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_2026-Apr-05_to_2026-Apr-08_258.5_26.0

Heat wave occuring from April 04 2026 to April 07 2026 at 49.5°N 241.5°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: April 04 2026 to April 07 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.8 °C
  • Mean temperature: 8.4 °C
  • Maximum temperature anomaly: 9.0 °C
  • Maximum temperature: 14.3 °C

Event center: 49.5°N 241.5°E

Area affected: 120426 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_2026-Apr-04_to_2026-Apr-07_241.5_49.5

Cold spell occuring from April 02 2026 to April 06 2026 at 58.0°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: 5 days

Time span: April 02 2026 to April 06 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -5.3 °C
  • Mean temperature: -5.6 °C
  • Minimum temperature anomaly: -8.8 °C
  • Minimum temperature: -10.0 °C

Event center: 58.0°N 202.0°E

Area affected: 52993 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_2026-Apr-02_to_2026-Apr-06_202.0_58.0

Heat wave occuring from March 21 2026 to March 23 2026 at 34.5°N 280.0°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 21 2026 to March 23 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 8.5 °C
  • Mean temperature: 19.1 °C
  • Maximum temperature anomaly: 12.6 °C
  • Maximum temperature: 26.1 °C

Event center: 34.5°N 280.0°E

Area affected: 379806 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_2026-Mar-21_to_2026-Mar-23_280.0_34.5