Category: Extremes affecting United States

Heat wave occuring from March 03 2026 to March 10 2026 at 44.5°N 270.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 8 days

Time span: March 03 2026 to March 10 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 8.7 °C
  • Mean temperature: 4.1 °C
  • Maximum temperature anomaly: 15.4 °C
  • Maximum temperature: 13.7 °C

Event center: 44.5°N 270.5°E

Area affected: 391824 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-03_to_2026-Mar-10_270.5_44.5

Cold spell occuring from February 24 2026 to April 17 2026 at 59.5°N 205.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • Greenland
  • United States

Duration: 53 days

Time span: February 24 2026 to April 17 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -8.6 °C
  • Mean temperature: -18.6 °C
  • Minimum temperature anomaly: -24.8 °C
  • Minimum temperature: -50.8 °C

Event center: 59.5°N 205.0°E

Area affected: 21077827 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-Feb-24_to_2026-Apr-17_205.0_59.5

Heat wave occuring from January 08 2026 to January 26 2026 at 62.0°N 216.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 19 days

Time span: January 08 2026 to January 26 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 9.5 °C
  • Mean temperature: 5.1 °C
  • Maximum temperature anomaly: 23.1 °C
  • Maximum temperature: 23.0 °C

Event center: 62.0°N 216.0°E

Area affected: 6054362 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-Jan-08_to_2026-Jan-26_216.0_62.0

Cold spell occuring from March 17 2026 to March 19 2026 at 30.5°N 274.5°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: March 17 2026 to March 19 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.7 °C
  • Mean temperature: 9.5 °C
  • Minimum temperature anomaly: -10.5 °C
  • Minimum temperature: 5.4 °C

Event center: 30.5°N 274.5°E

Area affected: 125252 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-Mar-17_to_2026-Mar-19_274.5_30.5

Cold spell occuring from March 16 2026 to March 18 2026 at 41.5°N 269.0°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: March 16 2026 to March 18 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -9.6 °C
  • Mean temperature: -6.3 °C
  • Minimum temperature anomaly: -15.8 °C
  • Minimum temperature: -11.5 °C

Event center: 41.5°N 269.0°E

Area affected: 72885 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-Mar-16_to_2026-Mar-18_269.0_41.5

Heat wave occuring from February 25 2026 to March 04 2026 at 49.0°N 240.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 8 days

Time span: February 25 2026 to March 04 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 6.5 °C
  • Mean temperature: 4.3 °C
  • Maximum temperature anomaly: 9.1 °C
  • Maximum temperature: 7.0 °C

Event center: 49.0°N 240.5°E

Area affected: 64825 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-Feb-25_to_2026-Mar-04_240.5_49.0

Cold spell occuring from February 22 2026 to March 05 2026 at 11.5°N 263.5°E

Download data: JSON

Event type: Cold spell

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

  • Bahamas
  • Belize
  • Cuba
  • Guatemala
  • Mexico
  • United States

Duration: 12 days

Time span: February 22 2026 to March 05 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.0 °C
  • Mean temperature: 19.3 °C
  • Minimum temperature anomaly: -11.5 °C
  • Minimum temperature: 4.3 °C

Event center: 11.5°N 263.5°E

Area affected: 1904195 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-Feb-22_to_2026-Mar-05_263.5_11.5

Cold spell occuring from February 19 2026 to February 22 2026 at 37.0°N 253.0°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: February 19 2026 to February 22 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -6.0 °C
  • Mean temperature: -11.7 °C
  • Minimum temperature anomaly: -9.7 °C
  • Minimum temperature: -18.1 °C

Event center: 37.0°N 253.0°E

Area affected: 62783 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-Feb-19_to_2026-Feb-22_253.0_37.0

Heat wave occuring from February 12 2026 to February 19 2026 at 44.5°N 190.5°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: February 12 2026 to February 19 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 3.3 °C
  • Mean temperature: 8.4 °C
  • Maximum temperature anomaly: 8.1 °C
  • Maximum temperature: 17.2 °C

Event center: 44.5°N 190.5°E

Area affected: 3966795 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-Feb-12_to_2026-Feb-19_190.5_44.5

Heat wave occuring from February 10 2026 to February 20 2026 at 24.0°N 197.5°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: February 10 2026 to February 20 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 1.6 °C
  • Mean temperature: 23.2 °C
  • Maximum temperature anomaly: 2.5 °C
  • Maximum temperature: 25.2 °C

Event center: 24.0°N 197.5°E

Area affected: 396896 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-Feb-10_to_2026-Feb-20_197.5_24.0