Category: Extremes affecting United States

Heat wave occuring from February 09 2026 to February 11 2026 at 33.5°N 266.0°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: February 09 2026 to February 11 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 8.8 °C
  • Mean temperature: 18.2 °C
  • Maximum temperature anomaly: 12.3 °C
  • Maximum temperature: 20.7 °C

Event center: 33.5°N 266.0°E

Area affected: 122448 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-09_to_2026-Feb-11_266.0_33.5

Cold spell occuring from February 01 2026 to February 28 2026 at 76.0°N 274.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • Greenland
  • Russian Federation
  • United States

Duration: 28 days

Time span: February 01 2026 to February 28 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -9.4 °C
  • Mean temperature: -33.7 °C
  • Minimum temperature anomaly: -26.6 °C
  • Minimum temperature: -59.3 °C

Event center: 76.0°N 274.5°E

Area affected: 7556909 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-01_to_2026-Feb-28_274.5_76.0

Cold spell occuring from January 21 2026 to February 22 2026 at 12.0°N 265.5°E

Download data: JSON

Event type: Cold spell

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

  • Bahamas
  • Belize
  • Canada
  • Colombia
  • Costa Rica
  • Cuba
  • El Salvador
  • Guatemala
  • Haiti
  • Honduras
  • Mexico
  • Nicaragua
  • Panama
  • Turks and Caicos Islands
  • United States

Duration: 33 days

Time span: January 21 2026 to February 22 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.7 °C
  • Mean temperature: 2.4 °C
  • Minimum temperature anomaly: -25.2 °C
  • Minimum temperature: -41.8 °C

Event center: 12.0°N 265.5°E

Area affected: 15448330 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-Jan-21_to_2026-Feb-22_265.5_12.0

Heat wave occuring from January 08 2026 to February 05 2026 at 58.0°N 142.5°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • Russian Federation
  • Svalbard and Jan Mayen
  • United States

Duration: 29 days

Time span: January 08 2026 to February 05 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 11.4 °C
  • Mean temperature: -10.1 °C
  • Maximum temperature anomaly: 32.3 °C
  • Maximum temperature: 17.2 °C

Event center: 58.0°N 142.5°E

Area affected: 11950817 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-Feb-05_142.5_58.0

Heat wave occuring from December 28 2025 to January 03 2026 at 55.0°N 234.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada
  • United States

Duration: 7 days

Time span: December 28 2025 to January 03 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 7.2 °C
  • Mean temperature: 4.0 °C
  • Maximum temperature anomaly: 15.6 °C
  • Maximum temperature: 10.3 °C

Event center: 55.0°N 234.0°E

Area affected: 429433 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-Dec-28_to_2026-Jan-03_234.0_55.0

Cold spell occuring from December 12 2025 to December 16 2025 at 41.5°N 282.5°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: December 12 2025 to December 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -10.0 °C
  • Mean temperature: -9.0 °C
  • Minimum temperature anomaly: -17.2 °C
  • Minimum temperature: -15.4 °C

Event center: 41.5°N 282.5°E

Area affected: 145745 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-Dec-12_to_2025-Dec-16_282.5_41.5

Cold spell occuring from December 12 2025 to December 16 2025 at 39.5°N 272.0°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: December 12 2025 to December 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -11.8 °C
  • Mean temperature: -12.6 °C
  • Minimum temperature anomaly: -19.9 °C
  • Minimum temperature: -20.7 °C

Event center: 39.5°N 272.0°E

Area affected: 193183 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-Dec-12_to_2025-Dec-16_272.0_39.5

Cold spell occuring from December 11 2025 to December 26 2025 at 26.0°N 170.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 16 days

Time span: December 11 2025 to December 26 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.3 °C
  • Mean temperature: 21.4 °C
  • Minimum temperature anomaly: -5.5 °C
  • Minimum temperature: 13.2 °C

Event center: 26.0°N 170.5°E

Area affected: 4154775 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-Dec-11_to_2025-Dec-26_170.5_26.0

Cold spell occuring from December 04 2025 to January 31 2026 at 58.0°N 223.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • China
  • Japan
  • Kazakhstan
  • Korea, Democratic People’s Republic of
  • Korea, Republic of
  • Mongolia
  • Russian Federation
  • United States

Duration: 59 days

Time span: December 04 2025 to January 31 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -11.4 °C
  • Mean temperature: -27.7 °C
  • Minimum temperature anomaly: -31.7 °C
  • Minimum temperature: -55.5 °C

Event center: 58.0°N 223.5°E

Area affected: 24818667 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-Dec-04_to_2026-Jan-31_223.5_58.0

Cold spell occuring from November 30 2025 to December 05 2025 at 39.5°N 270.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 6 days

Time span: November 30 2025 to December 05 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -7.8 °C
  • Mean temperature: -3.0 °C
  • Minimum temperature anomaly: -15.4 °C
  • Minimum temperature: -16.5 °C

Event center: 39.5°N 270.5°E

Area affected: 1211131 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-Nov-30_to_2025-Dec-05_270.5_39.5