Category: Extremes affecting United States

Cold spell occuring from May 31 2026 to June 03 2026 at 51.5°N 246.5°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 4 days

Time span: May 31 2026 to June 03 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -5.2 °C
  • Mean temperature: 8.1 °C
  • Minimum temperature anomaly: -8.8 °C
  • Minimum temperature: 2.7 °C

Event center: 51.5°N 246.5°E

Area affected: 125140 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-31_to_2026-Jun-03_246.5_51.5

Heat wave occuring from May 30 2026 to June 02 2026 at 34.5°N 263.5°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 4 days

Time span: May 30 2026 to June 02 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 4.0 °C
  • Mean temperature: 28.3 °C
  • Maximum temperature anomaly: 5.7 °C
  • Maximum temperature: 30.1 °C

Event center: 34.5°N 263.5°E

Area affected: 115597 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-30_to_2026-Jun-02_263.5_34.5

Cold spell occuring from May 27 2026 to June 06 2026 at 41.0°N 299.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 11 days

Time span: May 27 2026 to June 06 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.0 °C
  • Mean temperature: 6.6 °C
  • Minimum temperature anomaly: -7.9 °C
  • Minimum temperature: 2.2 °C

Event center: 41.0°N 299.0°E

Area affected: 710141 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-27_to_2026-Jun-06_299.0_41.0

Cold spell occuring from May 27 2026 to May 30 2026 at 33.0°N 245.0°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: May 27 2026 to May 30 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -4.5 °C
  • Mean temperature: 22.0 °C
  • Minimum temperature anomaly: -7.2 °C
  • Minimum temperature: 11.8 °C

Event center: 33.0°N 245.0°E

Area affected: 142066 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-27_to_2026-May-30_245.0_33.0

Cold spell occuring from May 27 2026 to May 30 2026 at 36.5°N 242.5°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: May 27 2026 to May 30 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.0 °C
  • Mean temperature: 11.7 °C
  • Minimum temperature anomaly: -9.6 °C
  • Minimum temperature: -1.9 °C

Event center: 36.5°N 242.5°E

Area affected: 144157 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-27_to_2026-May-30_242.5_36.5

Cold spell occuring from May 24 2026 to June 19 2026 at 80.5°N 197.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • Russian Federation
  • United States

Duration: 27 days

Time span: May 24 2026 to June 19 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -2.6 °C
  • Mean temperature: -3.0 °C
  • Minimum temperature anomaly: -12.5 °C
  • Minimum temperature: -14.3 °C

Event center: 80.5°N 197.0°E

Area affected: 5946999 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-24_to_2026-Jun-19_197.0_80.5

Heat wave occuring from May 24 2026 to May 29 2026 at 43.0°N 248.0°E

Download data: JSON

Event type: Heat wave

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

  • United States

Duration: 6 days

Time span: May 24 2026 to May 29 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 7.0 °C
  • Mean temperature: 20.6 °C
  • Maximum temperature anomaly: 8.6 °C
  • Maximum temperature: 25.4 °C

Event center: 43.0°N 248.0°E

Area affected: 108371 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-24_to_2026-May-29_248.0_43.0

Cold spell occuring from May 18 2026 to May 20 2026 at 44.0°N 260.5°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: May 18 2026 to May 20 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -7.2 °C
  • Mean temperature: 8.4 °C
  • Minimum temperature anomaly: -8.9 °C
  • Minimum temperature: 5.7 °C

Event center: 44.0°N 260.5°E

Area affected: 157355 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-18_to_2026-May-20_260.5_44.0

Cold spell occuring from May 18 2026 to June 02 2026 at 77.0°N 213.0°E

Download data: JSON

Event type: Cold spell

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

  • Canada
  • United States

Duration: 16 days

Time span: May 18 2026 to June 02 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -3.8 °C
  • Mean temperature: -6.3 °C
  • Minimum temperature anomaly: -11.0 °C
  • Minimum temperature: -15.9 °C

Event center: 77.0°N 213.0°E

Area affected: 2463140 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-18_to_2026-Jun-02_213.0_77.0

Cold spell occuring from May 17 2026 to May 22 2026 at 42.0°N 252.5°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: May 17 2026 to May 22 2026

Statistics over entire affected area:

  • Mean temperature anomaly: -8.0 °C
  • Mean temperature: 2.1 °C
  • Minimum temperature anomaly: -16.3 °C
  • Minimum temperature: -7.5 °C

Event center: 42.0°N 252.5°E

Area affected: 366474 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-17_to_2026-May-22_252.5_42.0