Category: Extremes affecting United States

Cold spell occuring from July 12 2026 to July 19 2026 at 30.0°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: 8 days

Time span: July 12 2026 to July 19 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.4 °C
  • Mean temperature: 24.1 °C
  • Minimum temperature anomaly: -7.2 °C
  • Minimum temperature: 19.4 °C

Event center: 30.0°N 258.5°E

Area affected: 531115 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2026-Jul-12_to_2026-Jul-19_258.5_30.0

Cold spell occuring from July 11 2026 to July 25 2026 at 53.0°N 190.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 15 days

Time span: July 11 2026 to July 25 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -3.4 °C
  • Mean temperature: 8.4 °C
  • Minimum temperature anomaly: -7.3 °C
  • Minimum temperature: -0.5 °C

Event center: 53.0°N 190.0°E

Area affected: 878637 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-Jul-11_to_2026-Jul-25_190.0_53.0

Heat wave occuring from July 06 2026 to July 13 2026 at 68.5°N 219.5°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: July 06 2026 to July 13 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.6 °C
  • Mean temperature: 17.3 °C
  • Maximum temperature anomaly: 10.8 °C
  • Maximum temperature: 23.0 °C

Event center: 68.5°N 219.5°E

Area affected: 211323 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jul-06_to_2026-Jul-13_219.5_68.5

Heat wave occuring from June 21 2026 to June 29 2026 at 28.5°N 257.5°E

Download data: JSON

Event type: Heat wave

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

  • Mexico
  • United States

Duration: 9 days

Time span: June 21 2026 to June 29 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 3.7 °C
  • Mean temperature: 31.2 °C
  • Maximum temperature anomaly: 5.9 °C
  • Maximum temperature: 35.7 °C

Event center: 28.5°N 257.5°E

Area affected: 355234 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-Jun-21_to_2026-Jun-29_257.5_28.5

Cold spell occuring from June 21 2026 to June 24 2026 at 41.5°N 273.0°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: June 21 2026 to June 24 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.5 °C
  • Mean temperature: 18.4 °C
  • Minimum temperature anomaly: -7.5 °C
  • Minimum temperature: 13.9 °C

Event center: 41.5°N 273.0°E

Area affected: 96095 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Cold_spell_2026-Jun-21_to_2026-Jun-24_273.0_41.5

Heat wave occuring from June 20 2026 to June 27 2026 at 64.5°N 199.0°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: June 20 2026 to June 27 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.2 °C
  • Mean temperature: 17.2 °C
  • Maximum temperature anomaly: 8.6 °C
  • Maximum temperature: 23.2 °C

Event center: 64.5°N 199.0°E

Area affected: 285758 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-Jun-20_to_2026-Jun-27_199.0_64.5

Heat wave occuring from June 18 2026 to June 25 2026 at 48.0°N 237.5°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: June 18 2026 to June 25 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.0 °C
  • Mean temperature: 17.0 °C
  • Maximum temperature anomaly: 8.5 °C
  • Maximum temperature: 25.3 °C

Event center: 48.0°N 237.5°E

Area affected: 257348 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-18_to_2026-Jun-25_237.5_48.0

Cold spell occuring from June 16 2026 to June 23 2026 at 40.0°N 264.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 8 days

Time span: June 16 2026 to June 23 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.6 °C
  • Mean temperature: 16.2 °C
  • Minimum temperature anomaly: -6.5 °C
  • Minimum temperature: 11.8 °C

Event center: 40.0°N 264.0°E

Area affected: 298604 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-Jun-16_to_2026-Jun-23_264.0_40.0

Cold spell occuring from June 14 2026 to June 30 2026 at 57.5°N 181.0°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 17 days

Time span: June 14 2026 to June 30 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -2.0 °C
  • Mean temperature: 4.1 °C
  • Minimum temperature anomaly: -4.9 °C
  • Minimum temperature: 1.8 °C

Event center: 57.5°N 181.0°E

Area affected: 1345302 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-Jun-14_to_2026-Jun-30_181.0_57.5

Cold spell occuring from June 13 2026 to June 30 2026 at 47.5°N 275.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 18 days

Time span: June 13 2026 to June 30 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -6.0 °C
  • Mean temperature: 5.8 °C
  • Minimum temperature anomaly: -10.4 °C
  • Minimum temperature: 1.8 °C

Event center: 47.5°N 275.0°E

Area affected: 93928 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-Jun-13_to_2026-Jun-30_275.0_47.5