Category: Extremes affecting United States

Heat wave occuring from May 16 2026 to May 23 2026 at 37.0°N 285.5°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: May 16 2026 to May 23 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 6.4 °C
  • Mean temperature: 22.6 °C
  • Maximum temperature anomaly: 12.2 °C
  • Maximum temperature: 29.8 °C

Event center: 37.0°N 285.5°E

Area affected: 999112 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-May-16_to_2026-May-23_285.5_37.0

Cold spell occuring from May 16 2026 to June 05 2026 at 58.5°N 200.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 21 days

Time span: May 16 2026 to June 05 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -2.7 °C
  • Mean temperature: 3.9 °C
  • Minimum temperature anomaly: -6.6 °C
  • Minimum temperature: -7.6 °C

Event center: 58.5°N 200.0°E

Area affected: 1587232 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-May-16_to_2026-Jun-05_200.0_58.5

Cold spell occuring from May 15 2026 to May 20 2026 at 52.5°N 254.0°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: May 15 2026 to May 20 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.7 °C
  • Mean temperature: 2.9 °C
  • Minimum temperature anomaly: -11.8 °C
  • Minimum temperature: -1.5 °C

Event center: 52.5°N 254.0°E

Area affected: 487484 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-May-15_to_2026-May-20_254.0_52.5

Heat wave occuring from May 12 2026 to May 22 2026 at 65.5°N 194.0°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: May 12 2026 to May 22 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 6.4 °C
  • Mean temperature: 8.8 °C
  • Maximum temperature anomaly: 9.9 °C
  • Maximum temperature: 13.6 °C

Event center: 65.5°N 194.0°E

Area affected: 76139 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-May-12_to_2026-May-22_194.0_65.5

Cold spell occuring from June 30 2026 to July 14 2026 at 51.5°N 180.0°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: June 30 2026 to July 14 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -1.6 °C
  • Mean temperature: 6.3 °C
  • Minimum temperature anomaly: -3.6 °C
  • Minimum temperature: 4.8 °C

Event center: 51.5°N 180.0°E

Area affected: 818150 km$^2$



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

Event ID: Cold_spell_2026-Jun-30_to_2026-Jul-14_180.0_51.5

Cold spell occuring from June 28 2026 to July 06 2026 at 61.0°N 220.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 9 days

Time span: June 28 2026 to July 06 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -5.1 °C
  • Mean temperature: 8.4 °C
  • Minimum temperature anomaly: -10.7 °C
  • Minimum temperature: -2.7 °C

Event center: 61.0°N 220.5°E

Area affected: 474217 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-28_to_2026-Jul-06_220.5_61.0

Cold spell occuring from June 27 2026 to July 03 2026 at 33.0°N 244.0°E

Download data: JSON

Event type: Cold spell

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

  • Mexico
  • United States

Duration: 7 days

Time span: June 27 2026 to July 03 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.3 °C
  • Mean temperature: 24.5 °C
  • Minimum temperature anomaly: -9.3 °C
  • Minimum temperature: 7.6 °C

Event center: 33.0°N 244.0°E

Area affected: 467227 km$^2$



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

Event ID: Cold_spell_2026-Jun-27_to_2026-Jul-03_244.0_33.0

Cold spell occuring from June 26 2026 to July 05 2026 at 68.0°N 188.0°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation
  • United States

Duration: 10 days

Time span: June 26 2026 to July 05 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -3.7 °C
  • Mean temperature: 1.0 °C
  • Minimum temperature anomaly: -10.3 °C
  • Minimum temperature: -0.7 °C

Event center: 68.0°N 188.0°E

Area affected: 340428 km$^2$



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

Event ID: Cold_spell_2026-Jun-26_to_2026-Jul-05_188.0_68.0

Cold spell occuring from June 23 2026 to July 01 2026 at 44.5°N 246.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 9 days

Time span: June 23 2026 to July 01 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.3 °C
  • Mean temperature: 10.9 °C
  • Minimum temperature anomaly: -12.2 °C
  • Minimum temperature: 0.1 °C

Event center: 44.5°N 246.5°E

Area affected: 715790 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-23_to_2026-Jul-01_246.5_44.5